21
2 Installation
Alpha Technologies
2.5 Connecting the External Alarm Port
An external alarm panel can be connected to the external alarm port (Figure 2.7). The port’s
contacts are rated at 30 VDC at 1 Amp.
An Emergency Power Off (EPO) switch is created by wiring a switch to Pins 7 and 8.
•
The switch must be a SPST, N.O. type and be electrically isolated (up to 1500 VAC
isolation is recommended). The connecting cable can be twisted or shielded wire not
more than 100 ft. long.
•
The contacts must be shorted for at least 1.5 seconds with unit shutdown about 2 seconds
after the shorting starts.
CAUTION:
The EPO switch does not disconnect the utility line. Switch off the circuit
breaker providing line power to the unit.
Figure 2.7
Wiring the External Alarm Port
8
7
6
5
4
3
2
1
EPO
Circuit
Optional
N.O. EPO Switch
N.C. Line
Present
N.C.
Battery OK
N.O. Line
Failure
N.O. Low
Battery Warning
Contact Rating:
30 VDC @ 1 Amp
UPS Internal
UPS External
1
8
RJ-45
Connector
(8-Pin Type)
