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AUTOM ATI C TR A N S FE R SWITCH , OTM _C _ 21D
Figure 7. Remote test connection in OTM_C_21D
In the test sequence, the main power supply circuit will be closed.
If the test sequence is interrupted due to power failure, the automatic transfer switch will
enter "automatic mode" after power recovery.
e.g., when the switch is in Position I:
Enter test signals; the switch transfers to
Position O à to Position II à to Position O à to
Position I. Entering test signals is invalid
before the automatic transfer switch returns
to its original position.
Under test mode, press the “AUTO” button to
cancel test mode and return to automatic
mode. The “Auto” LED will be “ON” as normal.
4. After the remote test finishes, the OTM_C_21D
automatically returns to the automatic mode
(“AUTO” LED is on).
Remote test
The procedure of the remote test is as follows
:
1. Connect to the remote test signal according to
Figure 7.
2. Ensure that the OTM_C_21D is in automatic
mode (“AUTO” LED is on).
3. Short circuit the remote test signal for at least
100 ms until the “AUTO” LED blinks to enter the
test mode. Under test mode, the automatic
transfer switch will simulate switching cycle
and finally return to its original position prior
to the activation of the test mode.
