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Remote Station Applications
Using the 7644-L8 Module
When the 7644-L8 is used for polarity reversal, it allows alarm and trouble events to be reported to a remote site. Alarms will override trou-
ble conditions and it will not be possible to reset the remote indicator until the condition is cleared and the control panel is reset.
To install the 7644-L8 for polarity reversal:
1.
Wire the 7644-L8 to the control panel as shown in Figure 4.47. Do not install an EOL resistor on the terminals of the NAC circuit used.
NOTE:
Use only NAC circuits on the control panel for reverse polarity.
2.
Program the NAC circuit as a notification circuit. See Section 8.5.2.
3.
Map the group to activate non silenceable, constant on in response to a system general alarm, and to discuss in response to a system
trouble.
4.
Intended for connection to a polarity reversal circuit of a remote station receiving unit having compatible rating.
RELAY 2
NO
C
4.18.4 Using a MR-201/T Control Relay From Air Products
When the MR-201/T control relay is wired for polarity reversal, it reports alarm and trouble events to a remote site. Alarms will override
trouble conditions and it will not be possible to reset the remote indicator until the condition is cleared and the control panel is reset. If an
alarm condition occurs, the alarm relay will close, overriding the trouble condition.
•
Current: 15mA max.
•
Operating Voltage: 24VDC nominal; 27.4 VDC max.
•
Resistance: 4kΩ
To install the MR-201/T for polarity reversal, follow the steps below:
1.
Wire the MR-201/T as shown in Figure 4.48.
.
Intended for connection to a polarity
reversal circuit of a remote station
receiving unit having compatible rating.
IFP-75 Series Manual — P/N LS10147-001SK-E:E 4/6/2022
FACP
SLC IN
RELAY 1
TROUBLE
_
NC
NO
C
NC
NO
C
NC
remote
indicator
Figure 4.47 Polarity Reversal Connection Using the 7644-L8
RELAY 2
RELAY 1
TROUBLE
NO
C
NC
NO
C
NC
NO
C
to remote
UL
receiving
Listed
station
EOLs
Figure 4.48 Polarity Reversal Connection Using the MR-201/T Relay
SLC OUT SLC PROG
SBUS
_
_
_
A
B
+
+
+
+
+
black
white
7644-L8
-
SLC OUT SLC PROG
SLC IN
SBUS
_
_
_
_
NC
A
B
+
+
+
+
1kΩ
resistor
MR-201
Control Panel Installation
NAC 1
NAC 2
black
NAC 1
NAC 2
4.7k UL-
listed EOL
white
7644-L8
53
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Troubleshooting
