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TP-6461 1/08 27 Section 2 Controller Troubleshooting
Voltage and Frequency Sensing
Parameter Default Adjustment Range
Undervoltage
dropout
90% of pickup 75%--98%
Undervoltage
pickup
90% of nominal 85%--100%
Overvoltage
dropout *
115% of
nominal*
106%--135%
Overvoltage pickup 95% of dropout 95%--100%
Unbalance enable Disable Enable/Disable
Unbalance dropout 20% 5%--20%
Unbalance pickup 10% 3%--18%
Voltage dropout
time
0.5 sec. 0.1--9.9 sec.
* 690 volts, maximum. Default = 110% for 600 volt applications.
Figure 2-5 Voltage Settings
Parameter Default Adjustment Range
Underfrequency
dropout
99% of pickup 95%--99%
Underfrequency
pickup
90% of nominal 80%--95%
Overfrequency
dropout
101% of pickup 101%--115%
Overfrequency
pickup
110% of nominal 105%--120%
Frequency dropout
time
3 sec. 0.1--15 sec.
Figure 2-6 Frequency Settings
2.5 Time Delays
Check the time delays when troubleshooting problems
with transfer switch operation.
Use the View Time Delays screen to check the settings
for the adjustable time delays. Figure 2-7 shows the
factory settings and adjustment ranges for the
adjustable time delays.
Observe the controller’s display to identify which time
delay is executing at any given time. Initiate a test and
observe as each programmed time delay executes.
Compare the operation to the test sequence illustrated
in the flowcharts in Figure 4-8 or Figure 4-9.
Adjustable Time Delays
Time Delay Default
Adjustment
Range
Emergency source engine start 3 sec. 0--6 sec.
[
Normal source engine start
(gen/gen mode)
0 sec.
Emergency source engine
cooldown
5 sec.
Normal source engine cooldown
(gen/gen mode)
2 sec.
Failure to acquire standby source 1 min.
Preferred to standby 1 sec.
Standby to preferred 15 min.
Pretransfer to preferred signal 0 sec.
0--60 min.
[
Post-transfer to preferred signal 0 sec.
Pretransfer to standby signal 0 sec.
Post-transfer to standby signal 0 sec.
Failure to synchronize 1 min.
Off (preferred to standby,
programmed-transition only)
1 sec.
Off (standby to preferred,
programmed-transition only)
1 sec.
Auto load test duration 30 min. 1--60 min.
]
[
Adjustable in 1 second increments. Engine start can be extended to
60 minutes with an External Battery Supply Module Kit.
]
1 minute increments.
Figure 2-7 Factory Settings, Time Delays