21
AU TO M AT I C T R A N SFER S W I TC H , OT M _ C _ 2 1 D
Table 8. Terminals
Figure 16. Terminals
The switch has 11 bits of signal terminals for users
to input and output signals.
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: generator start signal output. When the backup power is a generator, it is
used to start (close signal) and stop (open signal) the generator. After the switch transfers to
the normal power, the generator stop signal is sent after the preset delay for generator stop
(see the ninth bit in section 4.4 for the generator stop delay setting).
7,8,9
Switch status feedback signal output.
10, 11
Alarm: 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, fault
recovered, or handle inserted.
Output
contacts
Output contact relays are dry contactz and therefore external voltage supply is required.
24VDC or up to 250VAC max. 3A AC1
—
4.5 Terminal outputs and inputs
