60
Optional Isolated 24VDC Signal Input Power
In situations of extreme electrical noise, it may be preferable to power the alarm logic
and signal inputs from separate isolated power supplies. This will significantly reduce
any disturbance due to large currents flowing in the common supply lines. Systems
using isolated 24VDC logic and 24VDC signal supplies should be connected as
follows:-
Logic Supply
The 24VDC logic supply should be connected to the terminals VS and 0VS
on the logic rack. The logic supply is protected with a 5A fuse (F2) and a monitor LED
is provided to indicate the status of the fuse.
Signal Supply
The 24VDC signal supply should be connected to the signal supply input terminals
VC IN and OVC IN, this input is filtered and protected with a 1A fuse (F1) and
a monitor LED is provided to indicate the status of the fuse.
The signal supply voltage, (+24VDC), is available on teVC OUT for distribution
to the associated signal input contacts.
Please Note: - Each P925TS-I Input Card is equipped with a 3 pin header and 2 way
shorting bar that allow selection of inputs suitable for operation from 24VAC/DC or
125VAC/DC. Please ensure the jumper is in the correct position before applying
power.
+VC OUT
0VS
0VS
+VS
+VS
0VC IN
+VC IN
+VC OUT
+VS
P2
F2
F1
+VC OUT
P1
CONTACT FUSE 1A/F
RIBBON INPUT
RIBBON OUTPUT
24VDC SIGNAL SUPPLY
OUTPUT VOLTAGE
5
4
3
2
1
5
4
3
2
1
6
+VC OUT
SUPPLY FUSE 5A/T
FAIL
FAIL
6
0VS
CONTACT SUPPLY
RACK SUPPLY
24VDC SIGNAL SUPPLY
INPUT VOLTAGE
24VDC
LOGIC SUPPLY
24VDC Logic and Isolated 24VDC Signal Input Power Wiring