3-29
PFC-6800 • 5403602 • Rev B • 2/13
Reverse Polarity Communication Line Circuit
Only I/O 1 – I/O 4 on the PFC-6800 can be programmed as reverse polarity circuits. The short circuit current is rated at
24 VDC
and 14 mA maximum
. Please refer to the figure below for an example of wiring a reverse polarity communication line circuit.
Reverse Polarity Communication Line Circuit Wiring
Figure 26.
Notes
:
The panel has ground fault detection on reverse polarity circuits; impedance to ground for ground fault detection
1.
is 0 ohms.
The short circuit current is power limited and supervised by a Keltron TTM-RPS transmitter module.
2.
When configured for reverse polarity, the PFC-6800 will indicate alarm and trouble events to a remote site.
3.
The
4.
Alarms override
trouble conditions.
DWG #602-8
I/O 1 I/O 2
-
+ -
+
I/O 3 I/O 4
-
+ -
+
Note: IO circuit must configured as a Reverse Polarity circuit.
This connection is limited to same room installation . This connection shall
be limited to 20 feet and enclosed in conduit or equivalently protected
against mechanical injury .
Keltron
TTM-RPS
+
-
