IC-68
ND
INSTALLATION GUIDE
9
6.2.2 Typical Power Backup Wiring
A backup relay (DPDT) connects to the power source 1 in normal operation but will switch to the
power source 2 if source 1 is disabled. The backup relay must be selected to ensure it is able to
support the required power load.
FIGURE NO. 5 Typical Power Backup Wiring
8 PIN RELAY DPDT
(OMRON model MK2EP-UA-AC120)
3
4
5
6
2
1
8
7
NO 2
NO 1
NC 1
NC 2
COM 2
COM 1
L2/N
GND
L1
3
4
5
6
2
1
8
7
L2 L1
GND
source 1
DISTRIBUTION
PANEL
L2 L1
GND
N
LINE
115/230 VAC
source 2
DISTRIBUTION
PANEL
LINE
115/230 VAC
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