93-520-20 Issue 3.3
Page 15 of 60
CirrusPro Engineer’s Manual
27V dc power.
F input (PowerFault) wired to
+
for no
fault. Fault level at < 2.5V
Screen – ideally grounded at a single point
Twisted Pair In
Out
Cirrus Main PCB
Double stacked Terminals for general connection:
Fault/OP1/OP2/OP3/OP4: Changeover contacts
All Rated: 0.3 A at 125 VAC; 1 A at 30V DC
Auxiliary (VS) supply:
27V, Current limited to 300mA PTC protected
IP1/IP2/IP3/IP4:
Programmable Inputs:
4 monitored inputs for Isolate, Silence, reset and
‘Sensitivity Change’ feature.
Open circuit voltage: ~16V, Max applied voltage: 30V
Max. closed circuit resistance: 1500 Ohms
0V
Zero Volt connections
Ground Point
