Power Line Carrier ____________________________________________________________________
RF-MCGARDPRO
Hubbell Power Systems, Inc.
–
RFL™
Products
July 1, 2022
©2022 Hubbell Incorporated
5-75
5.7
Optional Switched Battery Power Supply
I/O Module, Single On/Off Switch
This module was developed for use when a PLC (On/Off) module is installed in an HPS/RFL
GARD Pro system chassis. Input power is feed out to an auxiliary device through the Switched
Battery Terminals as shown below. No communication interface is possible with this Power
Supply I/O when a double pole switch is used.
This Power Supply I/O will connect internal power supplies to an external auxiliary device and
provide major and minor alarm contacts. The switch has a dual function when placed in the OFF
position:
a.
Main power is disconnected.
b.
Power is disconnected to an auxiliary device.
!
C
NC
NO
C
NC
NO
POWER SUPPLY 1&2
SWITCHED BATT
MAJOR
MINOR
SW1
Power Inputs
Switched
Battery Output
to Auxiliary
Device
O
I
Figure 5-50. Optional Power Supply I/O Module, Single On/Off Switch
The “+” and “-” designations on the Power Supply I/O module rear panel terminals are totally
arbitrary and the AC or “+” and “-” DC external power sources can be connected to either
terminal. The major and minor alarm relays are contained on this interface and the connections
are brought out to the lower three terminals of each terminal block as shown in the figure above.
Both relays are energized under normal operating conditions and are de-energized for an alarm
or alert condition. This ensures that the chassis will cause an alarm condition when power is lost.