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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
Terminal outputs and inputs
The switch has 11 bits of signal terminals for users
to input and output signals.
Figure 15. Terminals
Terminal
No.
Function
1, 2
Remote test: connection for at least 100 ms for the switch to enter the remote test mode.
3, 4
EMRG OFF: Input the 24VDC EMRG OFF signals for at least 1s until the switch transfers to the
EMRG OFF position and the EMRG OFF LED is on. At this time, the switch cannot enter the
automatic or test mode and only handle operation is allowed. After the signal is canceled,
press "AUTO" to quit EMRG OFF.
5, 6
Generator start: Dry contact, Generator start signal output. When the secondary power is a
generator, they are used to start (close signal) and stop (disconnect signal) the generator.
After the switch transfers to the primary power, the generator stop signal is sent after the
preset delay for generator stop (see the No. 9 in section 4.3 for the generator stop delay
setting).
7,8,9
Switch status, Dry contact, Switch feedback output signal to show the actual position of the
transfer switch.
10, 11
Alarm: Dry contact, The switch outputs consecutive alarm signals in EMRG OFF mode or
refuses to perform operations. The alarm signals are cleared after quitting the EMRG OFF
mode or fault recovered.
Output
Output contact relays are dry contactz and therefore external voltage supply is required.
contacts
24VDC or up to 250VAC max. 3A AC1
Table 5. Terminals
15
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