RTK Series 725 Annunciator
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16.2 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
EXTERNALLY
GENERATED
SIGNAL
VOLTAGE
C2C1GPBGPAHNA HNB MULT
SPRSUPPLY 24VDC
+VCOVCOV +V
MR
ST
AT FR
24VDC LOGIC
SUPPLY
INTERNAL
1A SIGNAL
SUPPLY FUSE
TYPICAL SIGNAL INPUTS
16.3 Higher Voltage Direct Powered Inputs
If higher field contact voltages are required this must be specified at the time of the order to allow the
associated input conditioning components to be altered to suit. The following higher voltage
externally powered input options are available 48VAC/DC, 125VAC/DC, or 250VAC/DC. Wiring is
identical to the 24VDC-powered version shown above.
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