Voltage Tables - UTC Fire and Security Interlogix NX-8E Installation Manual

Voltage tables

The following tables show normal values for control panel voltages. if these
values are incorrect, you may experience trouble or fault conditions.
Table 11: Phone or power voltage values
Phone or power voltage
T to R and T1 to R1
T to R
T1 to R1
AC to AC
Data to common
Keypad positive to common
Aux power to common
Battery to battery
Table 12: Zone voltages ( 10%)
Zone condition
Zones, not doubled
Open
Good (3.3 kohm resistor)
Shorted
Two-wire smoke (680 ohm resistor)
Zones, doubled
Open
Only low zone OK (3.74 kohm resistor)
Only high zone OK (6398 kohm resistor)
Both high and low zones OK
Shorted
Normally open zones (such as four-wire smoke) Use low zone resistor (3.74 kohm resistor).
NX-8E Control Panel Installation Manual
Value
50 VDC not communicating (on hook)
7 VDC communicating (off hook)
0 VDC communicating (line seized)
17.5 VAC
6 VDC nominal (1.5 to 10 V, fluctuates)
13.5 VDC
13.5 VDC
13.5 VDC
Value
13 VDC
6.6 VDC
0 VDC
10.75 VDC
13 VDC
7 VDC
9 VDC
5.5 VDC
0 VDC
Cannot use the corresponding high zone.
Chapter 3: Reporting codes
63