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PDU Fault List
Display Message Meaning Corrective Action
System In Maintenance Bypass The system is in maintenance
bypass: the Q2 switch is open and
the Q3 switch is closed.
No corrective action necessary.
Min Output Voltage Alarm Phase-to-neutral output voltage for
phase <L-N> has dropped below the
congured limit.
Evaluate the threshold setting. If
necessary, adjust it for your situation.
Max Output Voltage Alarm Phase-to-neutral output voltage
for phase <L-N> exceeded the
congured limit.
Evaluate the threshold setting. If
necessary, adjust it for your situation.
Max Total Output Current Alarm Current of output phase <n>
exceeded the congured limit.
Evaluate the threshold setting. If
necessary, adjust it for your situation.
Min Total Output Current Alarm Current of output phase <n> dropped
below the congured limit.
Evaluate the threshold setting. If
necessary, adjust it for your situation.
Output Frequency Alarm Frequency of the output current is
above or below the range that is
congured as acceptable.
Evaluate the threshold setting. If
necessary, adjust it for your situation.
Critical Input Contact Fault A user-congured contact connected
to the system is reporting an alarm
condition.
Determine why the alarm has
occurred. This is a user-specic
alarm setting.
System Mode Alarm * The Q1 switch is open, and the
UPS is disconnected from the input
voltage.
Close the Q1 switch to reconnect the
UPS to utility/mains power.
System Mode Alarm * The Q2 & Q3 switches are open,
and the system is not supporting the
connected equipment.
For safety reasons, ensure that
the switches were not closed for
maintenance purposes. If the
switches are open, close Q2 for UPS
operation, and Q3 for maintenance
bypass.
System Mode Alarm * The alarm will be active in the event
Q3 is on at the same time as Q1 and
Q5.
Option 1: Resume normal UPS
operation.
Option 2: Go to maintenance
bypass.
Option 3: Contact Schneider
Electric Customer Support (see the
back cover).
Transformer Overheating The temperature of the transformer
has exceeded 18 °C.
Option 1: Resume normal UPS
operation.
Option 2: Go to maintenance
bypass.
Option 3: Contact Schneider
Electric Customer Support (see the
back cover).
Cooling Fan Failure Alarm One fan is not working or not
spinning fast enough, or one pole
of the 3-pole circuit breaker has
tripped.
Option 1: Make sure all four fans
are running.
Option 2: Check breaker positions.
Option 3: Contact Schneider
Electric Customer Support (see the
back cover).
* See the Event log for further clarication.
990–3015E-001
Symmetra™ PX48, 96, and 160 kW 400 V 100 kW 208 V Operation
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