ABB OTM_C_21D Installation And Operating Instructions Manual page 9

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
Automatic operation
OTM_C_21D must be in automatic mode and the
"AUTO" LED is on in order that the switch can per-
form automatic transfer cycles according to the
preset operating mode.
To operate the switch electrically:
If the handle inserted:
1. Press handle locking clip and remove the handle
from the switch.
2. Press "AUTO" button and the "AUTO" LED will
be ON, indicating automatic mode.
Figure 6. Selecting the automatic transfer OTM_C_21D switch to Auto Mode
System testing
Local test
In automatic mode, "AUTO" LED is ON and you
can transfer the switch using I, O, and II push but-
tons on the front panel of the switch. Press
"AUTO" button to return the automatic operation.
If handle is not inserted
1. If "AUTO" LED blinks, press "AUTO" button and
the "AUTO" LED will be ON, indicating
automatic mode.
2. Automatic operation includes three operating
modes: Line 1 priority (factory default setting),
No line priority, and manual back switching
mode.
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