Suppression Release Peripheral Application and Installation Instructions
4
IDNet Input
The SRP communicates with the FACP through the IDNet channel. The IDNet channel
connects to terminal TB3 on the SRP and accepts two 12 – 18 AWG wires on each of the
terminals.
An IDNet circuit has a communications power rating of 36.25 volts (maximum) at .5 A,
3333 baud.
NAC Input
Note:
Only SRP is allowed per NAC, no EOL supervision resistor is required on the NAC. The
Releasing Appliance Circuit (RAC) supervision module must be wired to the RAC output for
proper NAC supervision.
The SRP NAC Input monitors the NAC from the FACP. The NAC interface monitors the
NAC for NO POWER, SUPERVISION, and ACTIVE states. The NAC Input connects to
terminal TB1 on the SRP and accepts two 12 – 18 AWG wires on each of the terminals.
See Table 2 for maximum NAC wiring distance calculations. Refer to NAC wiring
diagrams for more details.
Releasing Appliance Circuit (RAC) Output Interface
The SRP monitors the output RAC wiring for opens and shorts. It will
NOT monitor the
coil
. A coil supervision module (2081-9046) must be placed as close to the coil as possible
to monitor the wiring. The RAC device connects to terminal TB2 on the SRP and accepts
up to 12 AWG wiring.
Due to the variety of actuators that can be used with this releasing device, the
minimum allowable voltage at the end of the RAC wiring is 20.4 V DC
. Line distances
must be calculated assuming a maximum voltage drop of 0.6 V (minimum SRP output –
coil supervision module – minimum actuator voltage; 21.7-.7-20.4) at the rated actuator
operating current, including the coil supervision module. See Table 3 for maximum RAC
wiring guidelines and distance calculations.
Table 2 provides the maximum NAC input wiring distances to the Suppression Release
Peripheral (SRP). The maximum distances are based on the actuator current draw, wire
gauge and total line resistance. The SRP provides a single Releasing Appliance Circuit
(RAC) to control the releasing actuator and a DC to DC regulator to ensure proper voltage
is supplied to the actuator. Due to the efficiency of the DC to DC regulator, the dedicated
NAC used to power the SRP must be rated at 2 amps for actuator loads up to 1 amp, or
3 amps for actuator loads greater than 1 amp up to 2 amps maximum. For actuator loads
up to 1.75 amps the maximum wiring distances are based on a total voltage drop of 3.4 V.
For 2 amp actuator loads the maximum wiring distance is based on a total voltage drop of
1.2 V.
Table 2. SRP NAC Wiring Distances
MAXIMUM NAC WIRING DISTANCES
Based on a total Drop of 3.4 V
RAC OUTPUT
CURRENT
(Refer to actuator
rating)
DISTANCE
TOTAL LINE
RESISTANCE
18 AWG
16 AWG
14 AWG
12 AWG
0.50 A
250’
399’
635’
1,010’
3.58
0.75 A
167’
266’
423’
673’
2.39
1.00 A
125’
199’
317’
505’
1.79
1.25 A
1
100’
159’
254’
404’
1.43
1.50 A
1
84’
133’
212’
337’
1.19
1.75 A
1
72’
114’
181’
289’
1.02
2.00 A
1,2
25’
39’
63’
100’
0.36
1
For RAC Output greater than 1.0 A, NAC must be at least 3 A Capacity
2
2.0 A RAC Output Line Distance is based on Total Drop of 1.2 V, NOT 3.4 V
SRP Terminal
Wiring
Inputs/Outputs
Wiring
Restrictions
Continued on next page
