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.

Situation	Possible cause	Corrective action
The PDU has no input power.	No input source available.	Restore input source. Check the wiring continuity between the PDU input and the input source.
Specific output circuit(s) have no power.	Associated branch breaker(s) is OFF.	Turn the branch breaker(s) ON.
	The wiring between the branch breaker(s) and the equipment is incorrect.	Check for wiring continuity and correct phase sequence between the branch breaker(s) and the equipment.
	The equipment associated with the branch 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 breaker is inoperable.	Replace the inoperable branch breaker.
No output from the PDU, but the display is active.	The main input breaker MIB is OFF.	Record which alarm indications are active. Reset alarm(s) and clear external signal. Check the alarm history display for reasons why the main input breaker MIB tripped. Below is a list of possible causes: Manual trip, due to an emergency power off (EPO) button being pushed. An alarm shutdown has occurred. Determine the cause and take corrective action before resetting the main input breaker MIB. 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 breaker MIB. Replace the main input breaker MIB. Short circuit internal to the PDU. Troubleshoot the PDU or contact Schneider Electric.
No output from the PDU, but the display is active.	The main input switch MIS is OFF.	Turn the main input switch MIS ON.
Output from the PDU is on, but the display is not active.	Control power fuse(s) 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.
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 breaker in position X apparent power is below the minimum threshold.	Check the power for the affected branch breaker, evaluate the threshold setting, and adjust for your situation.
Branch Breaker <position X> Apparent Power Overload	Branch breaker in position X, apparent power is above the maximum threshold.	Check the power for the affected branch breaker, evaluate the threshold setting, and adjust for your situation.
Branch Breaker <position X> High Current Alarm at Phase <LX>	Branch breaker in position X, phase L1, L2, or L3 current is above the high threshold.	Check the current for the affected branch breaker, evaluate the threshold setting, and adjust for your situation.
Branch Breaker <position X> Low Current Alarm at Phase <LX>	Branch breaker in position X, phase L1, L2, or L3 current is below the low threshold.	Check the current for the affected branch breaker, evaluate the threshold setting, and adjust for your situation.
Branch Breaker <position X> Maximum Current Alarm at Phase <LX>	Branch breaker in position X, phase L1, L2, or L3 current is above the maximum threshold.	Check the current for the affected branch breaker, evaluate the threshold setting, and adjust for your situation.
Branch Breaker <position X> Minimum Current Alarm at Phase <LX>	Branch breaker in position X, phase L1, L2, or L3 current is below the minimum threshold.	Check the current for the affected branch breaker, evaluate the threshold setting, and adjust for your situation.
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 depending on your situation.
EPO Activated	The EPO was activated.	Reset EPO. Check the remote EPO for the room or the fire control panel, or the EPO button located on the front panel of the PDU.
Input Breaker Open	The main input breaker is open.	Check the main input breaker and adjust position or alarm settings depending on your situation.
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 for your situation.
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 for your situation.
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 for your situation.
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 for your situation.
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 for your situation.
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 for your situation.
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 for your situation.
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 for your situation.
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 for your situation.
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 for your situation.
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 for your situation.
Output Breaker Open	The main output breaker is open.	Check the main output breaker and adjust position or alarm settings depending on your situation.
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 for your situation.
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 for your situation.
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 for your situation.
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 for your situation.
Output Frequency Out of Range	The output frequency is out of range.	Check the output frequency, evaluate the threshold setting, and adjust for your situation.
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 for your situation.
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 for your situation.
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 for your situation.
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 for your situation.
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 for your situation.
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 metering 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 is found.