NEX7250 Zone 2 Annunciator
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19.2 Standard Systems Using Externally Powered Inputs
24VDC powered inputs. As an option systems can use externally generated signal supply voltage
sources to power the inputs.
If the externally generated signal supply voltage is 24VAC/DC then the standard annunciator can be
used without modification.
The external supply should be connected to signal supply input terminals, OVC and +VC to distribute
the voltage required to power the input contacts. +VC is used to internally link the externally
generated signal supply voltage, via a fuse, to all of the common terminals within the annunciator
marked “C” to allow connection to customer signal contacts
Systems Using Isolated Logic And Signal Supplies
C
2
C
1
GPB
GPA
HNA HNB
MULT
SPR
SUPPLY 24VDC
M
R ST
A
T
FR
24VDC LOGIC
SUPPLY
INTERNAL
1A SIGNAL
SUPPLY FUSE
TYPICAL SIGNAL INPUTS
OV
+VC
+V
OVC
EXTERNALLY
GENERATED
SIGNAL
VOLTAGE