Services and Support

Services and Support

Our company offers end-to-end, one-on-one customer service—from consultation and order placement to installation—ensuring that any issues are promptly resolved for you.

CM5Z Series Intelligent Molded Case Circuit Breakers

Fault Description Possible causes Troubleshooting
The circuit breaker is used for motor protection; it trips during the starting process, resulting in a failed start. 1) If the motor is started directly, the starting current will be at least eight times the normal operating current, and may even exceed ten times. If the instantaneous overcurrent protection setting multiplier is improperly selected, the circuit breaker will trip during startup, preventing the motor from completing its start-up process. 1) Whether the connected load is a motor that requires direct-on-line starting, and what the starting current is; 2) Appropriately determine the circuit breaker’s rated current and the multiple of the instantaneous trip setting.
2) If the distribution cabinet is located far from the equipment, resulting in significant line voltage drop, the motor terminal voltage will fall below its rated voltage, causing the starting current to increase and triggering a trip.

1) Determine the motor terminal voltage (P = IUcos Φ);

2) Appropriately determine the circuit breaker’s rated current and the multiple of the instantaneous trip setting current.

3) If the motor is started under load, verify that the load is operating normally. Any signs of stalling or abnormal noises in the mechanical components can lead to poor operation, resulting in difficult starting, a sudden surge in current, and excessively long start-up times, which may trigger a trip. Additionally, equipment such as pumps and conveyors, when started under load, may trip if the start-up duration exceeds the allowable limit.

1) Inspect the mechanical condition of the motor (and its load).

2) Appropriately determine the circuit breaker’s rated current and the multiple of the instantaneous trip setting current.

During operation, the circuit breaker occasionally trips. 1) Overload tripping caused by three-phase load imbalance. 1) Determine whether the three-phase currents are relatively balanced.
2) On-site equipment frequently experiences short-term overloads, causing the system to trip after energy has accumulated for a certain period. Ensure that the circuit breaker is operated within its rated range; the trip setting of the circuit breaker may be appropriately increased.
3) Grounding protection of the distribution-type three-pole circuit breaker has operated.

1) The Ir4 setting value is greater than the unbalanced current.

2) Disable the grounding protection function.

A short-circuit overreach trip occurs during the operation of a circuit breaker. There may be two possible scenarios:

1) The molded-case circuit breaker does not trip, while the universal-type circuit breaker trips;

2) The low-voltage circuit breaker (including molded-case circuit breakers and universal-type circuit breakers) does not trip, while the high-voltage protective device trips.

Typically, improper coordination of protective characteristics among series‑connected circuit breakers results in inadequate protection. When conducting analysis, it is essential to consider the line configuration, including the length and cross‑sectional area of the connecting cables, as well as the duration of short‑circuit faults.

1) Inspect the circuit breaker’s status on-site; if no tripping failure is observed, the product shall be deemed to be in normal condition.

2) Test the characteristics to determine whether the circuit breaker is qualified or not;

3) Select circuit breakers appropriately.

Cannot be switched on or off electrically. 1) The manual/automatic position on the electric actuator is incorrect. Dial to the correct position.
2) No electric actuator power supply. Confirm that the electric actuator power supply is correct.
3) No suitable voltage with undervoltage accessory Ensure that the undervoltage accessory has an appropriate voltage.
Communication is abnormal. 1) No communication power supply. 1) Verify that the communication power supply is correct.
2) The communication wiring is incorrect or has been broken. 1) Check the communication cable and ensure it is wired correctly.
3) The RS485/RS232 conversion adapter is defective. 1) Replace the converter.
4) Connecting too many devices can degrade the drive’s performance. 1) Add a termination resistor and a pull-up resistor at the terminal.

 

CM5 Series Molded Case Circuit Breakers

Fault Description Possible causes Troubleshooting
The circuit breaker is used for motor protection; it trips during the starting process, resulting in a failed start. 1) If the motor is started directly, the starting current is at least eight times the rated operating current, and may even exceed ten times. If the instantaneous overcurrent protection setting multiplier is improperly selected, the circuit breaker will trip during startup, preventing the motor from completing its start-up sequence.

1) Is the connected load a motor that requires direct-on-line starting, and what is its starting current?

2) Appropriately determine the circuit breaker’s rated current and the multiple of the instantaneous trip setting.

2) If the distribution cabinet is located far from the equipment, resulting in significant line voltage drop, the motor terminal voltage will fall below its rated voltage, causing the starting current to increase and triggering a trip.

1) Determine the motor terminal voltage (P = IUcos Φ);

2) Appropriately determine the circuit breaker’s rated current and the multiple of the instantaneous trip setting current.

3) If the motor is started under load, verify that the load is operating normally. Any signs of stalling or abnormal noises in the mechanical components can lead to poor operation, resulting in difficult starting, a sudden surge in current, and excessively long start-up times, which may trigger a trip. Additionally, equipment such as pumps and conveyors, when started under load, may trip if the start-up duration exceeds the allowable limit.

1) Inspect the mechanical condition of the motor (and its load).

2) Appropriately determine the circuit breaker’s rated current and the multiple of the instantaneous trip setting current.

During operation, the circuit breaker occasionally trips. 1) Overload tripping caused by three-phase load imbalance. 1) Determine whether the three-phase currents are relatively balanced.
2) If the cross-section of the connecting cable or copper busbar is too small, it can overheat, causing the circuit breaker to trip.

1) Determine the cross-sectional area and length of the connecting cable or copper busbar.

2) Select the appropriate cross-sectional area of connecting cables or busbars according to the sample specifications.

3) Select the appropriate length of connecting cables or busbars.

3) If the connecting screws are not tightened or there is poor contact, the contact resistance will increase, leading to significant heat generation and even melting, which can cause the circuit breaker to trip.

1) Verify that the connections between the circuit breaker and the cable and copper busbar are secure.

2) Tighten the connection screws between the circuit breaker and the cable or copper busbar.

4) During plug-in or pull-out installation, if the connector is loose and makes poor contact, it can overheat severely, causing a circuit breaker trip.

1) Determine the contact condition of the plug;

2) Reliable connection plug.

A short-circuit overreach trip occurs during the operation of a circuit breaker. There may be two possible scenarios:

1) The molded-case circuit breaker does not trip, while the universal-type circuit breaker trips;

2) The low-voltage circuit breaker (including molded-case circuit breakers and universal-type circuit breakers) does not trip, while the high-voltage protective device trips.

Typically, improper coordination of protective characteristics among series‑connected circuit breakers results in inadequate protection. When conducting analysis, it is essential to consider the line configuration, including the length and cross‑sectional area of the connecting cables, as well as the duration of short‑circuit faults.

1) Inspect the circuit breaker’s status on-site; if no tripping failure is observed, the product shall be deemed to be in normal condition.

2) Test the characteristics to determine whether the circuit breaker is qualified or not;

3) Select circuit breakers appropriately.

 

CM3DC Series DC Molded Case Circuit Breakers

Fault Description Possible causes Troubleshooting
During operation, the circuit breaker occasionally trips. 1) Using cables or copper busbars with undersized cross sections can lead to overheating, causing the circuit breaker to trip.

1) Determine the cross-sectional area and length of the connecting cable or copper busbar.

2) Select the appropriate cross-sectional area of connecting cables or busbars according to the sample specifications.

3) Select the appropriate length of connecting cables or busbars.

2) If the connecting screws are not tightened or there is poor contact, the contact resistance will increase, leading to significant heat generation and even melting, which can cause the circuit breaker to trip.

1) Verify that the connections between the circuit breaker and the cable and copper busbar are secure.

2) Tighten the connection screws between the circuit breaker and the cable or copper busbar.

 

CM3E Series Electronic Molded Case Circuit Breakers

Fault Description Possible causes Troubleshooting
The circuit breaker is used for motor protection; it trips during the starting process, resulting in a failed start. 1) If the motor is started directly, the starting current is at least eight times the normal operating current, and may even exceed ten times. If the instantaneous overcurrent protection setting multiplier is improperly selected, the circuit breaker will trip during startup, preventing the motor from completing its start-up process.

1) Is the connected load a motor that starts directly, and what is its starting current?

2) Appropriately determine the circuit breaker’s rated current and the multiple of the instantaneous trip setting current.

2) If the distribution cabinet is located far from the equipment, resulting in significant line voltage drop, the motor terminal voltage will fall below its rated voltage, causing the starting current to increase and triggering a trip.

1) Determine the motor terminal voltage (P = IUcos Φ);

2) Appropriately determine the circuit breaker’s rated current and the multiple of the instantaneous trip setting current.

3) If the motor is started under load, verify that the load is normal. Any signs of stalling or abnormal noises in the mechanical components can lead to poor operation, resulting in difficult starting, a sudden surge in current, and excessively long start-up times, which may trigger a trip. Additionally, equipment such as pumps and conveyors, when started under load, may trip if the start-up duration exceeds the allowable limit.

1) Inspect the mechanical condition of the motor (and its load).

2) Appropriately determine the circuit breaker’s rated current and the multiple of the instantaneous trip setting current.

During operation, the circuit breaker occasionally trips. 1) Overload tripping caused by three-phase load imbalance. 1) Determine whether the three-phase currents are relatively balanced.
2) On-site equipment frequently experiences short-term overloads, causing energy to accumulate and resulting in a trip after a certain period. Ensure that the circuit breaker is operated within its rated range; the trip setting can be appropriately increased.

A short-circuit overreach trip occurs during the operation of a circuit breaker. There may be two possible scenarios:

1) The molded-case circuit breaker does not trip, while the universal-type circuit breaker trips;

2) The low-voltage circuit breaker (including molded-case circuit breakers and universal-type circuit breakers) does not trip, while the high-voltage protective device trips.

Typically, improper coordination of protective characteristics among series‑connected circuit breakers results in inadequate protection. When conducting analysis, it is essential to consider the line configuration, including the length and cross‑sectional area of the connecting cables, as well as the duration of short‑circuit faults.

1) Inspect the circuit breaker’s status on-site; if no tripping failure is observed, the product shall be deemed to be in normal condition.

2) Test the characteristics to determine whether the circuit breaker is qualified or not;

3) Select circuit breakers appropriately.

 

CM3ZL/ZH Series Automatic Reclosing Molded Case Circuit Breakers with Residual Current Protection

Fault Description Possible causes Troubleshooting
The circuit breaker is used for motor protection; it trips during the starting process, resulting in a failed start. 1) If the motor is started directly, the starting current will be at least eight times the rated operating current, and may even exceed ten times. If the instantaneous overcurrent protection setting multiplier is improperly selected, the circuit breaker will trip during startup, preventing the motor from completing its start-up sequence.

1) Is the connected load a motor that requires direct-on-line starting, and what is its starting current?

2) Appropriately determine the circuit breaker’s rated current and the multiple of the instantaneous trip setting current.

2) If the distribution cabinet is located far from the equipment, resulting in significant line voltage drop, the motor terminal voltage will fall below its rated voltage, causing the starting current to increase and triggering a trip.

1) Determine the motor terminal voltage (P = IUcos Φ);

2) Appropriately determine the circuit breaker’s rated current and the multiple of the instantaneous trip setting current.

3) If the motor is started under load, verify that the load is normal. Any signs of stalling or abnormal noises in the mechanical components can lead to poor operation, resulting in difficult starting, a sudden surge in current, and excessively long start-up times, which may trigger a trip. Additionally, equipment such as pumps and conveyors, when started under load, may trip if the start-up duration exceeds the allowable limit.

1) Inspect the mechanical condition of the motor (and its load).

2) Appropriately determine the circuit breaker’s rated current and the multiple of the instantaneous trip setting current.

During operation, the circuit breaker occasionally trips. 1) The total residual current in the system exceeds the set residual current threshold. 1) Set the residual current protection threshold correctly.
2) On-site equipment and poor wire insulation have resulted in leakage current faults. 1) Promptly inspect aging wiring and equipment to eliminate safety hazards.
3) The operating speed of the residual current protection of the circuit breaker is faster than that of the downstream circuit breaker equipped with residual current protection. 1) Set the residual current protection delay time correctly.
During operation, a short circuit causes an overreaching trip. There are two possible scenarios: 1) The molded-case circuit breaker fails to trip, while the universal-type circuit breaker trips; 2) The low-voltage circuit breakers (including both molded-case and universal-type types) fail to trip, but the high-voltage protective devices do trip. Typically, improper coordination of protective characteristics among series‑connected circuit breakers results in inadequate protection. During analysis, it is essential to consider the line configuration, including the length and cross‑sectional area of the connecting cables, as well as the duration of short‑circuit faults.

1. Inspect the circuit breaker’s status on-site; if no tripping failure is observed, the product shall be deemed to be in normal condition.

2. Test the characteristics to determine whether the circuit breaker is qualified;

3. Select circuit breakers appropriately.

Cannot be switched on/off electrically. 1) The electrical/manual position on the electric actuator is incorrect. Dial to the correct position
2) No electric actuator power supply. Ensure that the main circuit power supply is functioning properly.
3) No suitable voltage with undervoltage accessory Ensure that the undervoltage accessory has an appropriate voltage.
Communication is abnormal. 1) No communication power supply. Ensure that the main circuit power supply is functioning properly.
2) The communication wiring is incorrect or has been broken. Inspect the communication cable and ensure it is wired correctly.
3) The RS485/RS232 conversion adapter is defective. Replace the converter.
4) Connecting too many devices results in poor drive capability. Add a matching resistor and a pull-up resistor at the terminal.

 

CM3ZL Series Intelligent Molded Case Circuit Breakers with Residual Current Protection

Fault Description Possible causes Troubleshooting
The circuit breaker is used for motor protection; it trips during the starting process, resulting in a failed start. 1) If the motor is started directly, the starting current is at least eight times the normal operating current, and may even exceed ten times. If the instantaneous overcurrent protection setting multiplier is improperly selected, the circuit breaker will trip during startup, preventing the motor from completing its start-up sequence.

1) Is the connected load a motor that starts directly, and what is its starting current?

2) Appropriately determine the circuit breaker’s rated current and the multiple of the instantaneous trip setting current.

2) If the distribution cabinet is located far from the equipment, resulting in significant line voltage drop, the motor terminal voltage will fall below its rated voltage, causing the starting current to increase and triggering a trip.

1) Determine the motor terminal voltage (P = IUcos Φ);

2) Appropriately determine the circuit breaker’s rated current and the multiple of the instantaneous trip setting current.

3) If the motor is started under load, verify that the load is operating normally. Any signs of stalling or abnormal noises in the mechanical components can lead to poor operation, resulting in difficult starting, a sudden surge in current, and excessively long start-up times, which may trigger a trip. Additionally, equipment such as pumps and conveyors, when started under load, may trip if the start-up duration exceeds the allowable limit.

1) Inspect the mechanical condition of the motor (and its load).

2) Appropriately determine the circuit breaker’s rated current and the multiple of the instantaneous trip setting current.

During operation, the circuit breaker occasionally trips. 1) The total residual current in the system exceeds the set residual current threshold. 1) Set the residual current protection threshold correctly.
2) On-site equipment and poor wire insulation have resulted in leakage current faults. 1) Promptly inspect aging wiring and equipment to eliminate safety hazards.
3) The tripping speed of the residual current protection device in the circuit breaker is faster than that of the downstream residual current‑protected circuit breaker. 1) Set the residual current protection delay time correctly.

A short-circuit overreach trip occurs during the operation of a circuit breaker. There may be two possible scenarios:

1) The molded-case circuit breaker does not trip, while the universal-type circuit breaker trips;

2) The low-voltage circuit breaker (including molded-case circuit breakers and universal-type circuit breakers) does not trip, while the high-voltage protective device trips.

Typically, improper coordination of protective characteristics among series‑connected circuit breakers results in inadequate protection. When conducting analysis, it is essential to consider the line configuration, including the length and cross‑sectional area of the connecting cables, as well as the duration of short‑circuit faults.

1. Inspect the circuit breaker’s status on-site; if no tripping failure is observed, the product shall be deemed to be in normal condition.

2. Test the characteristics to determine whether the circuit breaker is qualified;

3. Select circuit breakers appropriately.

Communication is abnormal. 1) No communication power supply. Ensure that the main circuit power supply is functioning properly.
2) The communication wiring is incorrect or has been broken. Inspect the communication cable and ensure it is wired correctly.
3) The RS485/RS232 conversion adapter is defective. Replace the converter.
4) Connecting too many devices results in poor drive capability. Add a matching resistor and a pull-up resistor at the terminal.

 

CM3L Series Molded Case Circuit Breakers with Residual Current Protection

Fault Description Possible causes Troubleshooting
The circuit breaker is used for motor protection; it trips during the starting process, resulting in a failed start. 1) If the motor is started directly, the starting current is at least eight times the rated operating current, and may even exceed ten times. If the instantaneous overcurrent protection setting multiplier is improperly selected, the circuit breaker will trip during startup, preventing the motor from completing its start-up sequence.

1) Is the connected load a motor that requires direct-on-line starting, and what is its starting current?

2) Appropriately determine the circuit breaker’s rated current and the multiple of the instantaneous trip setting current.

2) If the distribution cabinet is located far from the equipment, resulting in significant line voltage drop, the motor terminal voltage will fall below its rated voltage, causing the starting current to increase and triggering a trip.

1) Determine the motor terminal voltage (P = IUcos Φ);

2) Appropriately determine the circuit breaker’s rated current and the multiple of the instantaneous trip setting current.

3) If the motor is started under load, verify that the load is operating normally. Any signs of stalling or abnormal noises in the mechanical components can lead to poor operation, resulting in difficult starting, a sudden surge in current, and excessively long start-up times, which may trigger a trip. Additionally, equipment such as pumps and conveyors, when started under load, may trip if the start-up duration exceeds the allowable limit.

1) Inspect the mechanical condition of the motor (and its load).

2) Appropriately determine the circuit breaker’s rated current and the multiple of the instantaneous trip setting current.

During operation, the circuit breaker occasionally trips. 1) Overload tripping caused by three-phase load imbalance. 1) Determine whether the three-phase currents are relatively balanced.
2) If the cross-section of the connecting cable or copper busbar is too small, it can overheat, causing the circuit breaker to trip.

1) Determine the cross-sectional area and length of the connecting cable or copper busbar.

2) Select the appropriate cable or busbar cross-section according to the sample.

3) Select the appropriate length of connecting cables or busbars.

3) If the connecting screws are not tightened or there is poor contact, the contact resistance will increase, leading to significant heat generation and even melting, which can cause the circuit breaker to trip. 3) Verify that the connections between the circuit breaker and the cable, as well as between the circuit breaker and the copper busbar, are secure. 4) Tighten the connection screws for the circuit breaker, cable, and copper busbar.
4) During plug-in installation, if the connector is loose or has poor contact, it can overheat severely, causing a circuit breaker trip.

1. Determine the plug-in contact condition.

2. Reliable connection connector.

The circuit breaker tripped due to a leakage current. 1) A three-phase circuit breaker is selected, but the presence of single-phase loads with a neutral conductor or control circuits on the load side causes the vector sum of the load-side currents to exceed the residual current setting, resulting in tripping. 1. Select a four-pole circuit breaker.
2) The total residual current in the system exceeds the set residual current threshold. 2. Properly set the residual current protection threshold.
3) The tripping speed of the residual current protection device in the circuit breaker is faster than that of the downstream residual current protective circuit breaker. 3. Select time-delay circuit breakers.

A short-circuit overreach trip occurs during the operation of a circuit breaker. There may be two possible scenarios:

1) The molded-case circuit breaker does not trip, while the universal-type circuit breaker trips;

2) The low-voltage circuit breaker (including molded-case circuit breakers and universal-type circuit breakers) does not trip, while the high-voltage protective device trips.

Typically, improper coordination of protective characteristics among series‑connected circuit breakers results in inadequate protection. When conducting analysis, it is essential to consider the line configuration, including the length and cross‑sectional area of the connecting cables, as well as the duration of short‑circuit faults.

1. Inspect the circuit breaker’s status on-site; if no tripping failure is observed, the product shall be deemed to be in normal condition.

2. Test the characteristics to determine whether the circuit breaker is qualified;

3. Select circuit breakers appropriately.

 

CM3 Series Molded Case Circuit Breakers

Fault Description Possible causes Troubleshooting
The circuit breaker is used for motor protection; it trips during the starting process, resulting in a failed start. 1) If the motor is started directly, the starting current is at least eight times the rated operating current, and may even exceed ten times. If the instantaneous overcurrent protection setting multiplier is improperly selected, the circuit breaker will trip during startup, preventing the motor from completing its start-up sequence.

1) Is the connected load a motor that requires direct-on-line starting, and what is its starting current?

2) Appropriately determine the circuit breaker’s rated current and the multiple of the instantaneous trip setting.

2) If the distribution cabinet is located far from the equipment, resulting in significant line voltage drop, the motor terminal voltage will fall below its rated voltage, causing the starting current to increase and triggering a trip.

1) Determine the motor terminal voltage (P = IUcos Φ);

2) Appropriately determine the circuit breaker’s rated current and the multiple of the instantaneous trip setting current.

3) If the motor is started under load, verify that the load is operating normally. Any signs of stalling or abnormal noises in the mechanical components can lead to poor operation, resulting in difficult starting, a sudden surge in current, and excessively long start-up times, which may trigger a trip. Additionally, equipment such as pumps and conveyors, when started under load, may trip if the start-up duration exceeds the allowable limit.

1) Inspect the mechanical condition of the motor (and its load).

2) Appropriately determine the circuit breaker’s rated current and the multiple of the instantaneous trip setting current.

During operation, the circuit breaker occasionally trips. 1) Overload tripping caused by three-phase load imbalance. 1) Determine whether the three-phase currents are relatively balanced.
2) If the cross-section of the connecting cable or copper busbar is too small, it can overheat, causing the circuit breaker to trip.

1) Determine the cross-sectional area and length of the connecting cable or copper busbar.

2) Select the appropriate cross-sectional area of connecting cables or busbars according to the sample specifications.

3) Select the appropriate length of connecting cables or busbars.

3) If the connecting screws are not tightened or there is poor contact, the contact resistance will increase, leading to significant heat generation and even melting, which can cause the circuit breaker to trip.

1) Verify that the connections between the circuit breaker and the cable and copper busbar are secure.

2) Tighten the connection screws between the circuit breaker and the cable or copper busbar.

4) During plug-in or pull-out installation, if the connector is loose and makes poor contact, it can overheat severely, causing a circuit breaker trip.

1) Determine the contact condition of the plug;

2) Reliable connection plug.

A short-circuit overreach trip occurs during the operation of a circuit breaker. There may be two possible scenarios:

1) The molded-case circuit breaker does not trip, while the universal-type circuit breaker trips;

2) The low-voltage circuit breaker (including molded-case circuit breakers and universal-type circuit breakers) does not trip, while the high-voltage protective device trips.

Typically, improper coordination of protective characteristics among series‑connected circuit breakers results in inadequate protection. When conducting analysis, it is essential to consider the line configuration, including the length and cross‑sectional area of the connecting cables, as well as the duration of short‑circuit faults.

1) Inspect the circuit breaker’s status on-site; if no tripping failure is observed, the product shall be deemed to be in normal condition.

2) Test the characteristics to determine whether the circuit breaker is qualified or not;

3) Select circuit breakers appropriately.

 

CA1B Series Automatic Transfer Switch

Type B controller

Fault phenomenon Possible causes Troubleshooting methods
All indicator lights are off. The main circuit wiring is incorrect, or there is no power in the main circuit. Inspect the main circuit, paying particular attention to whether the neutral (N) conductor is connected correctly.
All indicator lights are flashing at a frequency of 1 Hz. Both the normal and backup power supply voltages are outside the controller’s operating voltage range. Check the voltage of the normal and standby A-phase power supplies.
The common power indicator light is off. The main circuit is commonly without voltage or has excessively low voltage. Check the common A-phase supply voltage.
The backup power indicator is off. The backup main circuit has no voltage or the voltage is too low. Check the standby A-phase supply voltage.
The common power indicator light is flashing at a frequency of 1 Hz. Common closing failure Press the “Reset” button on the panel to verify that the operating mechanism functions properly and that the circuit breaker handle operates normally.
The backup power indicator is flashing at a frequency of 1 Hz. Backup closing failure
The common power indicator light is flashing at a frequency of 5 Hz. Common closing failure
The backup power indicator is flashing at a frequency of 5 Hz. Backup closing failure
The normal and standby closing indicator lights are flashing simultaneously. The normal and standby closing indicator lights are flashing simultaneously. Replace the circuit breaker
Dual-position fault, frequency 5 Hz Replace the dual-position signal switch.
The common trip indicator light is on. Common circuit breaker tripping Press the “Reset” button on the panel or manually re‑trip the circuit breaker: if the fault persists, the circuit breaker or its auxiliary contacts must be replaced.
The standby trip indicator light is on. Trip of the standby circuit breaker
Common or backup re-dial failed. The circuit breaker’s reclosing mechanism has failed, and the drive portion of the operating mechanism does not fully actuate the circuit breaker handle to the reclosing position. Replace circuit breakers that can no longer trip, or replace the operating mechanism.

 

BZ(T) Type Controller

Fault phenomenon Possible causes Troubleshooting methods
The display controller shows no output. The main circuit wiring is incorrect, or there is no power in the main circuit. Inspect the main circuit, paying particular attention to whether the neutral (N) conductor is connected correctly.
The switch does not toggle. The working mode is incorrect. Check the operating mode on the controller and configure it as needed; inspect the toggle switches on the device panel and set them accordingly.
Long delay time
Common or standby trip Trip of the service circuit breaker or the standby circuit breaker Press the “△” and “Confirm” keys simultaneously to reset or manually re‑trip.
Common or backup re-dial failed. The circuit breaker’s reclosing mechanism has failed, and the drive portion of the operating mechanism does not fully actuate the circuit breaker handle to the reclosing position. Replace circuit breakers that can no longer trip, or replace the operating mechanism.
Unable to access parameter settings. Forgot Password Enter the super password: 3727
Unable to communicate Communication line open circuit, short circuit, or incorrect polarity. Check the communication line.
The host computer cannot modify parameters or perform remote control. The controller is in local mode. Set the controller to remote mode.

 

CA1 Series Automatic Transfer Switch

Fault phenomenon Possible causes Troubleshooting methods
The fault light is flashing continuously. Overload or short circuit causes the circuit breaker to trip. Eliminate the line fault and press the “Reset” button on the controller.
The adapter’s undervoltage and overvoltage indicator lights are constantly on. Incorrect wiring; damage to the adapter caused by lightning strikes or prolonged overvoltage. Replace the adapter
The controller is “automatically” not functioning, and in both the “normal” mode and the “standby” (or “generator”) mode, one circuit is out of service. Figure 9 Figure 9
The controller does not operate in “Automatic” mode; it is forcibly set to normal operation in “Normal” mode and “Standby” (or “Generator”) mode. Figure 10 Figure 10
The controller is displaying abnormally. Figure 11 Figure 11
The controller has no display. Figure 12 Figure 12
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