Terminal Outputs And Inputs - ABB OTM C 21D Installation And Operating Instructions Manual

4. Interface and Settings

4.5 Terminal outputs and inputs

The switch has 11 bits of signal terminals for users to input and output signals.
Terminal Function
No.
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
contacts required. 24VDC or up to 250VAC max. 3A AC1
Figure 15. Terminals
Table 5. Terminals
1SCC303015M0201 l ABB Installation and operating instructions, 34OTM_C_21D rev. B
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