VERSATEK VX-MD4024 - Housekeeping and Alarm Contact Output Interface

1 — Installation of the VX-MD4024
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1.2.10 Housekeeping and Alarm Contact Output Interface
The VX-MD4024 has an RJ-50 port (HK) on the front panel to provide four housekeeping inputs
and one alarm contact output. Generally, housekeeping contacts can connect to environment-
sensor- controlled switch to indicate the operation environment condition.
The HK circuit contains a photo coupler powered by the VX-MD4024 to detect the “open” or
“close” status of the loop between HK_IN and HK_COM (user does not need to feed 3.3v power
into the circuit). As to the alarm output, there is a relay between ALMOUT and ALMCOM to
control the status of the loop to be “open” or “close” to the alarm equipment (close between
ALMOUT and ALMCOM for alarm; open if no alarm).
The pin assignment of housekeeping and alarm contact output interface is illustrated below:
1 2 3 4 5 6 7 8 9 10
ALMOUT
HK1IN
HK1COM
HK2IN
HK3COM
HK4IN
HK4COM
ALMCOM
1
2
3
4
5
6
7
8
HK2COM
HK3IN
9
10
Figure 1-17 Pin assignment of Housekeeping Inputs and Alarm Contact Output