NFS-640 Systems
68 PN 15842:K 7/23/2002
Q.3 Providing Power to Annunciators
NFS-640 panels have an integral
on-board power supply. The
annunciator’s power supply is
connected to TB7 of the control
panel as shown in the
accompanying illustration. No
more than 1.25A can be drawn
from these power-limited
terminals in standby or alarm.
The power run to the annunciator does not require a Power Supervision Relay.
Loss of power is inherently supervised through a Communications loss. This
24 VDC output is supervised, power-limited, filtered, and non-resettable.
TB7
-
+
-
+
-
+
acs640pwr.cdr
24 VDC
TB7 on NFS-640
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