Troubleshooting

The following is a list of the most common situations where the equipment does not perform as intended, the most likely cause, and a possible corrective action.

If the suggested corrective action does not return the equipment to normal operation, contact Schneider Electric for assistance.

PDU Troubleshooting

Situation	Possible cause	Corrective action
The PDU has no input power.	No input source is available.	Restore the input source. Check the wiring continuity between the PDU input and the input source.
The PDU has no input power.	Main input circuit breaker MIB/main input switch MIS is tripped because the manual restart key is in the ON position.	Follow Start Up the PDUto start up the PDU. See Set Manual Restart to ON or OFF for the PDU for details about the manual restart function.
Specific output circuit(s) have no power.	Associated branch circuit breaker(s) is OFF.	Turn the branch circuit breaker(s) ON.
	The wiring between the branch circuit breaker(s) and the equipment is incorrect.	Check for wiring continuity and correct phase sequence between the branch circuit breaker(s) and the equipment.
	The equipment associated with the branch circuit breaker is operating above the rated load.	Schedule a load check of the equipment with Schneider Electric; adjust for load balance if possible.
	The branch circuit breaker is inoperable.	Replace the inoperable branch circuit breaker.
No output from the PDU, but the display is active.	The main input circuit breaker MIB is in the OFF (open) position.	Record which alarm indications are active. Reset alarm(s) and clear external signal. Check the alarm history display for reasons why the main input circuit breaker MIB tripped. Below is a list of possible causes: Manual trip, due to an emergency power off (EPO) button being pushed. Automatic trip. An external signal was received from the building wiring via the alarm interface instructing the PDU to shunt-trip. Output overload. Schedule a load check of the PDU with Schneider Electric. Inoperable main input circuit breaker MIB. Replace the main input circuit breaker MIB. Short circuit internal to the PDU. Troubleshoot the PDU or contact Schneider Electric. An alarm shutdown has occurred. Determine the cause and take corrective action before resetting the main input circuit breaker MIB. Turn main input circuit breaker MIB to the ON (closed) position. If the main input circuit breaker MIB still trips, contact Schneider Electric.
No output from the PDU, but the display is active.	The main input switch MIS is in the OFF (open) position.	Record which alarm indications are active. Reset alarm(s) and clear external signal. Check the alarm history display for reasons why the main input switch MIS tripped. Below is a list of possible causes: Manual trip, due to an emergency power off (EPO) button being pushed. Automatic trip. An external signal was received from the building wiring via the alarm interface instructing the PDU to shunt-trip. Inoperable main input switch MIS. Replace the main input switch MIS. An alarm shutdown has occurred. Determine the cause and take corrective action before resetting the main input switch MIS. Turn the main input switch MIS ON (closed) position. If the main input switch MIS still trips, contact Schneider Electric.
Output from the PDU is on, but the display is not active.	Control power fuse(s) is/are blown.	Replace fuse(s).
Overvoltage/undervoltage.	Upstream UPS or power conditioner is inoperable.	Correct problem at the power source.
Overvoltage/undervoltage.	Voltage drop due to distance or excessive load on output.	Reduce the distance or reduce the load.

Alarm Messages

Display alarm text	Description	Corrective action
<LX> Phase Loss Alarm	Line supply phase L1, L2, or L3 loss is detected.	Check the input source and the affected phase. Check for blown/inoperable fuses.
A Circuit Breaker within the Unit has Tripped	A circuit breaker within the unit has tripped.	Check the circuit breaker and identify the cause of the tripping. Clear the tripping event and close the circuit breaker.
Branch Breaker <position X> Apparent Power Below Minimum	Branch circuit breaker in position X apparent power is below the minimum threshold.	Check the power for the affected branch circuit breaker, evaluate the threshold setting, and adjust as per provided specifications.
Branch Breaker <position X> Apparent Power Overload	Branch circuit breaker in position X, apparent power is above the maximum threshold.	Check the power for the affected branch circuit breaker, evaluate the threshold setting, and adjust as per provided specifications.
Branch Breaker <position X> High Current Alarm at Phase <LX>	Branch circuit breaker in position X, phase L1, L2, or L3 current is above the high threshold.	Check the current for the affected branch circuit breaker, evaluate the threshold setting, and adjust as per provided specifications.
Branch Breaker <position X> Low Current Alarm at Phase <LX>	Branch circuit breaker in position X, phase L1, L2, or L3 current is below the low threshold.	Check the current for the affected branch circuit breaker, evaluate the threshold setting, and adjust as per provided specifications.
Branch Breaker <position X> Maximum Current Alarm at Phase <LX>	Branch circuit breaker in position X, phase L1, L2, or L3 current is above the maximum threshold.	Check the current for the affected branch circuit breaker, evaluate the threshold setting, and adjust as per provided specifications.
Branch Breaker <position X> Minimum Current Alarm at Phase <LX>	Branch circuit breaker in position X, phase L1, L2, or L3 current is below the minimum threshold.	Check the current for the affected branch circuit breaker, evaluate the threshold setting, and adjust as per provided specifications.
Branch Circuit Breaker <position X> Open	The branch circuit breaker in position X is open.	Check the branch circuit breaker and adjust position or alarm settings as per actual installation sequence on distribution.
EPO Activated	The EPO is activated.	Reset the EPO, see Reset EPO Alarm or Buzzer. Check the remote EPO for the room or the fire control panel.
Input Breaker Open	The main input circuit breaker is open.	Check the main input circuit breaker and adjust follow the instructions provided in PDU Troubleshooting.
Input Current High Alarm at Phase <LX>	The input phase L1, L2, or L3 current is above the high threshold.	Check the input current for the affected phase, evaluate the threshold setting, and adjust as per provided specifications.
Input Current Low Alarm at Phase <LX>	The input phase L1, L2, or L3 current is below the low threshold.	Check the input current for the affected phase, evaluate the threshold setting, and adjust as per provided specifications.
Input Current Maximum Alarm at Phase <LX>	The input phase L1, L2, or L3 current is above the maximum threshold.	Check the input current for the affected phase, evaluate the threshold setting, and adjust as per provided specifications.
Input Current Minimum Alarm at Phase <LX>	The input phase L1, L2, or L3 current is below the minimum threshold.	Check the input current for the affected phase, evaluate the threshold setting, and adjust as per provided specifications.
Input Voltage Maximum Alarm at Phase <LX>	The input phase L1, L2, or L3 voltage is above the maximum threshold.	Check the input voltage for the affected phase, evaluate the threshold setting, and adjust as per provided specifications.
Input Voltage High Alarm at Phase <LX>	The input phase L1, L2, or L3 voltage is above the high threshold.	Check the input voltage for the affected phase, evaluate the threshold setting, and adjust as per provided specifications.
Input Voltage Low Alarm at Phase <LX>	The input phase L1, L2, or L3 voltage is below the low threshold.	Check the input voltage for the affected phase, evaluate the threshold setting, and adjust as per provided specifications.
Input Voltage Minimum Alarm at Phase <LX>	The input phase L1, L2, or L3 voltage is below the minimum threshold.	Check the input voltage for the affected phase, evaluate the threshold setting, and adjust as per provided specifications.
NMC Communication Lost with <X> Meter	Lost the local network management interface-to-input meter, output meter, or branch meter communication.	Check the signal cables. Check that the meter is energized and that it has been configured correctly — use the power meter documentation supplied with the power meter. If the alarm persists, contact Schneider Electric.
Output Active Power Phase <LX> Overload	The output active power for phase L1, L2, or L3 is above the selected high threshold.	Check the output power for the affected phase, evaluate the threshold setting, and adjust as per provided specifications.
Output Apparent Power Phase <LX> Below Normal	The output apparent power for phase L1, L2, or L3 is below the selected minimum threshold.	Check the output power for the affected phase, evaluate the threshold setting, and adjust as per provided specifications.
Output Apparent Power Phase <LX> Overload	The output apparent power for phase L1, L2, or L3 is above the selected maximum threshold.	Check the output power for the affected phase, evaluate the threshold setting, and adjust as per provided specifications.
Output Current High Alarm at Phase <LX>	The output phase L1, L2, or L3 current is above the high threshold.	Check the output current for the affected phase, evaluate the threshold setting, and adjust as per provided specifications.
Output Current Low Alarm at Phase <LX>	The output phase L1, L2, or L3 current is below the low threshold.	Check the output current for the affected phase, evaluate the threshold setting, and adjust as per provided specifications.
Output Current Maximum Alarm at Phase <LX>	The output phase L1, L2, or L3 current is above the maximum threshold.	Check the output current for the affected phase, evaluate the threshold setting, and adjust as per provided specifications.
Output Current Minimum Alarm at Phase <LX>	The output phase L1, L2, or L3 current is below the minimum threshold.	Check the output current for the affected phase, evaluate the threshold setting, and adjust as per provided specifications.
Output Frequency Out of Range	The output frequency is out of range.	Check the output frequency, evaluate the threshold setting, and adjust as per provided specifications.
Output Power Factor Deviation Alarm at Phase <LX>	Output power factor deviation for phase L1, L2, or L3 exists.	Check the output power factor deviation for the affected phase, evaluate the threshold setting, and adjust as per provided specifications.
Output Voltage High Alarm at Phase <LX>	The output phase L1, L2, or L3 voltage is above the high threshold.	Check the output voltage for the affected phase, evaluate the threshold setting, and adjust as per provided specifications.
Output Voltage Low Alarm at Phase <LX>	The output phase L1, L2, or L3 voltage is below the low threshold.	Check the output voltage for the affected phase, evaluate the threshold setting, and adjust as per provided specifications.
Output Voltage Maximum Alarm at Phase <LX>	The output phase L1, L2, or L3 voltage is above the maximum threshold.	Check the output voltage for the affected phase, evaluate the threshold setting, and adjust as per provided specifications.
Output Voltage Minimum Alarm at Phase <LX>	The output phase L1, L2, or L3 voltage is below the minimum threshold.	Check the output voltage for the affected phase, evaluate the threshold setting, and adjust as per provided specifications.
Transformer High Temperature Alarm	Temperature at input transformer is higher than the normal range.	Check that the ventilation of the PDU is not blocked and review the information available from the PDU display to determine if the PDU is overloaded.
Transient Voltage Surge Suppressor Alarm	Transient voltage surge suppressor system requires service.	Contact Schneider Electric to schedule a maintenance visit.

NOTE: Contact Schneider Electric if the PDU is operating correctly and the alarm persists, or if no root cause has been found.