ABB OTM C 21D User Manual

8
AUTOMATIC TRANSFER SWITCH, OTM_C_21D
To operate the switch manually:
1. Attach the handle to the switch panel. You can
attach the handle in any position.
2. When the handle is attached, the automatic
transfer switch will automatically be in Manual
mode and won’t operate automatically in case
of line failure. The AUTO LED on the mimic panel
is OFF.
Figure 5. Operating the switch manually
When the handle is inserted into the switch, the switch will enter “manual mode” with the
automatic operation disabled.
Do not adjust wires when the transfer switch is being energized.
Before the power-on operation of the transfer switch, please operate the switch manually
to confirm it is in normal function.
With the power supply function in “normal” and without the handle inserted and EMRG OFF
signals, the initially energized switch will enter automatic mode and transfer to the main
line. Keep the handle inserted if you do not want the switch to be in automatic mode upon
initial energization.
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3. Quick start
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3.1 Operating the switch manually (local operation)

ABB OTM C 21D Specifications

General

Brand	ABB
Model	OTM C 21D
Category	Switch
Language	English