381333-395 Troubleshooting 3-1
Troubleshooting for MV ATS
Hazardous voltage capable of causing shock,
burns, or death is used in the switch. Do not
touch the power or load terminal of the transfer
switch!
Check in Numerical Sequence
Problem
1 Operation 2 Gen-Set
3 Voltage on
Display
Gen-Set does not start
when the Transfer
Control switch is turned
and held in Transfer Test
position or when the
normal source fails.
Hold Transfer Test switch 15
seconds or the outage must
be long enough to allow for
Feature 1C time delay plus
engine cranking and starting
time.
Starting control must be in
the automatic position.
Batteries must be charged
and connected. Check
wiring to engine starting
contacts on customer
terminal block TB. Verify on
the controller that small
plug J3 is connected to
receptacle P3.
Transfer switch does not
transfer the load to the
emergency source after
the engine-generator set
starts.
Wait for Feature 2B time
delay to time out (if used).
Generator output circuit
breaker must be closed.
Generator frequency must
be at least 95% of nominal
(57 Hz for a 60 Hz system.)
Emergency
voltage on
controller display
should read at
least 90% of
nominal phase to
phase voltage.
Transfer switch does not
transfer the load to normal
source when normal
returns or when the
Transfer Control switch is
released.
Wait for Feature 3A time
delay to time out (if used).
Normal voltage on
controller display
should read at
least 90% of
nominal phase to
phase voltage.
Engine-generator set does
not stop after load
retransfer to the normal
source.
Wait for Feature 2E time
delay to time out (if used).
Starting control must be in
the automatic position.
Circuit breaker trips (on an
ATS without
protective
relay)
Check the controller display for error messages and determine the cause of the
trip. After the fault is cleared, turn the Breaker Control switch to CLOSE. Press
the Alarm Reset button.
The CB should close.
Circuit breaker trips (on an
ATS with a protective
relay)
Check the protective relay and determine the cause of the trip (refer to device’s
instructions). After fault is cleared, reset the protective relay. Then reset the
Lock-Out Relay by turning it to RESET. Next turn the Breaker Control switch to
CLOSE. Press the Alarm Reset button.
The CB should close.
Refer to the Group 5 Controller User’s Guide
381333-126 for ATS status display messages, time
delays, pickup & dropout settings, & adjustments.
DANGER
!
