Specifications

Symmetra PX 48, 96, and 160 kW 400 V and 100 kW 208 V Operation28
PDU Fault List
Display Message Meaning Corrective Action
Maintenance Bypass Alarm The system is in maintenance
bypass: the Q2 switch is open
and the Q3 switch is closed.
No corrective action necessary.
Output V <Ln-N>
Voltage Under Limit
Phase-to-neutral output voltage
for phase <L-N> has dropped
below the configured limit.
Evaluate the threshold setting. If necessary,
adjust it for your situation.
Output V <Ln-N>
Voltage Over Limit
Phase-to-neutral output voltage
for phase <L-N> exceeded the
configured limit.
Evaluate the threshold setting. If necessary,
adjust it for your situation.
Output I L<n>
Current Over Limit
Current of output phase <n>
exceeded the configured limit.
Evaluate the threshold setting. If necessary,
adjust it for your situation.
Output I L<n>
Current Under Limit
Current of output phase <n>
dropped below the configured
limit.
Evaluate the threshold setting. If necessary,
adjust it for your situation.
Output FDev
Freq Out of Range
Frequency of the output current
is above or below the range that
is configured as acceptable.
Evaluate the threshold setting. If necessary,
adjust it for your situation.
<User Contact Name>
Alarm Active
A user-configured contact
connected to the system is
reporting an alarm condition.
Determine why the alarm has occurred. This is
a user-specific alarm setting.
No UPS Input
Breaker Q1 Open
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.
No Panel Feed
Breakers Q2 & Q3 Open
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.
A typical Bypass 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 APC Customer Support.
Transformer Overheating
Alarm
The temperature of the
transformer has exceeded 18°C.
Option 1: Check for obstructions to air flow.
Option 2: Reduce load.
Option 3: Check ambient air temperature.
Option 4: Contact APC Customer Support.
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 APC Customer Support.