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13 Operation Manual Universal Transfer Switch UTS6 UTS6H UTS6BI UTS10BI
Troubleshooting
Use this chart to solve minor UTS problems.
Refer to www.apc.com for assistance with complex UTS problems.
Problem and Possible Cause Solution
Problem: While operating on utility power the UTS repeatedly drops some connected loads
Cause: One or more circuits may be in
Security Mode.
Using the Circuit Setup button on the UTS, check to verify the status of
Security Mode.
Cause: The LCD displays a message
indicating that one or more circuits may
be experiencing an overload condition.
Reduce the load on the affected circuits or have a qualified electrician
upgrade the circuit amp capacity.
Problem: While operating on backup power the UTS repeatedly drops some connected loads
Cause: ALM may be enabled. • Disable ALM using the System Setup button.
NOTE: When ALM is disabled overload conditions can occur causing a
generator to stall, a circuit breaker to trip, or loads may experience
severe low voltage conditions.
Cause: The circuit may be incorrectly
configured as delayable.
Use the Circuit Setup button to navigate to CKT DELAYABLE screen for
the circuit affected. Disable the circuit delayable option, (select NO). This
disables ALM for that circuit. Repeat this process for all circuits affected.
Cause: The circuit may be incorrectly
configured for MAX OFF and MIN
ON.
Change the parameters for Maximum OFF and Minimum ON times, for
circuits supporting loads being adversely affected by drops.
Cause: The generator power rating is
set too low.
Refer to System Setup: Backup1 Power Rating in this manual.
Problem: While operating on backup power the generator stalls, shuts down or the circuit breaker trips
repeatedly
Cause: The generator power rating is
set too high causing an overload
condition.
Refer to System Setup: Backup1 Power Rating in this manual.
Cause: The Generator Surge Overload
Delay Time is set too high.
Refer to System Setup: Generator Surge Overload Delay Time in this
manual.
Cause: ALM has been disabled
causing an overload condition for the
generator.
Enable ALM. Refer to these sections in this manual.
• System Setup: Load Shedding, and Time Management
• Circuit Setup: Delayable Circuits