ABB Zenith ZT30 Operation And Maintenance Manual page 58

Troubleshooting and Diagnostics (Cont.)
SYMPTOM ANNUNCIATION
No power to None
controller
Isolation ATS will N/A
not rack in
Unable to insert N/A
Racking Handle
Table T7-1 cont: Troubleshooting and diagnostics
Zenith Automatic Transfer Switch
POSSIBLE CAUSE(S)
Input power disconnected
DANGER: Electric current could
still be present on current carrying
elements on ATS.
Racking operation inhibited
Padlock Latch is in the
Lock position
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TROUBLESHOOT STEP 1
Check for position of Maintenance Switch on
and S5-13)
Check fuse status on Electrical Panel input fuse
S5-13)
Check if Racking Solenoid is preventing racking
operation
Check to see if Padlock Latch assembly is
preventing handle insertion
ACTIONS TO BE TAKEN
Turn Maintenance Switch to the ON
position
Replace fuse
For the Racking Solenoid to allow
racking operation:
Power source availability
(check controller indication)
Maintenance Switch on Electrical Panel
S5-12 and S5-13)
Bypass ATS is closed into either source
Isolation ATS is in between the
Isolate and Auto position
Control Switch is in the
"INHIBIT" position
If above conditions are met , determine
if racking solenoid is in working
condition. Refer to Section 4G for racking
solenoid location.
Unlock latch assembly.
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