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A U TO M AT I C T R A N S F E R S W I TC H , OT M _ C _ 2 1 D
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8. Maintenance and common
troubleshooting
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8.1 Maintenance
To ensure the operation reliability of switches, regular switching tests should be performed (once
every 3 months) to confirm normal function.
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8.2 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
6
"I" or "II" LED blinking
7
Power supply functioning normally
and LED blinks
8
OTM_C21D cannot be controlled to
transfer by Modbus module
9
OTM_C21D Modbus parameters
cannot be modified
Table 10. 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
OTM_C21D is in Local
monitoring mode, remote
control is not available
OTM_C21D is in Local
monitoring mode, parameters
modification is not available
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.
Modify OTM_C21D to Remote control
mode then remote transfer commands are
available
Modify OTM_C21D to Remote control mode
then parameters modification is available
29
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