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A U T O M AT I C T R A N S F E R S W I T C H , O T M _ C _ 2 1 D
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Maintenance and common troubleshooting
Maintenance
To ensure the operation reliability of switches, regu-
lar switching tests should be performed (once every
3 months) to confirm normal function.
—
Common troubleshooting
No
Fault Description
1
Power supply functioning
normally, but LED not on
2
Power supply LED functioning
normally but "AUTO" LED off, or
no response with "AUTO" button
pressed
3
Switching failure in case of
faulty power supply
4
EMRG OFF function failure
5
"AUTO" LED blinking No
response from buttons
6
"I" or "II" LED blinking
7
Power supply functioning
normally and LED blinks
Table 7. Troubleshooting
Fault Analysis
Control unit power supply
terminal not connected with
switch wiring terminal
Handle not pulled out
or electrical padlock not
removed
1. Switch not operating in
automatic mode
2. Both power supplies
malfunctioning
1. Check if the EMRG OFF
signal is 24V DC
2. Too short duration of
EMRG OFF signal
1.DIP switch setting is invalid
2.Generator is ON in no
priority mode
Execution rejected during
switching operation, thus
expected result not achieved
Wrong connection of the N
wire
Troubleshooting Method
Check and connect the power
line
Pull out the handle or remove
the padlock, and then press the
"AUTO" button
Make sure the switch working in
automatic mode; check and make
sure both power supplies are not
malfunctioning simultaneously
Correctly switch on the EMRG
OFF signal, which should only be
24V DC with the duration ≥ 1 s
Check if the DIP switch setup
matches the power supply.
Turn off generator in no priority
mode.
Manually set the switch to
Position "O", and press the
"AUTO" button to reset
Re-connect the wires
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