NFS2-640/E Installation Manual —
P/N 52741:P2 7/10/14
35
Connecting the Power Cables
Installation
3.7.4 Installing and Connecting the Batteries
Batteries are installed in the control panel cabinet
or in a separate battery cabinet which can be
mounted below the control panel or up to 20 feet
(6.096 m) away from the control panel, in conduit
in the same room.
Connect the battery as follows (see Figure 3.14
above):
1. Install batteries into bottom of cabinet or into
separate battery cabinet.
2. Connect the red cable from TB3(+) on the
CPS-24/E power supply to the positive (+)
terminal of one battery.
3. Connect the black cable from TB3(–) on the
CPS-24/E power supply to the negative (–) terminal of the
other
battery.
4. Connect the remaining cable between the negative (-) terminal on the first battery to the
positive (+) terminal on the second battery.
3.7.5 External DC Power Output Connections
Terminal TB10 provides two (2) power outputs, resettable and non-resettable. Each output is
power-limited. Follow sequence of steps in Section 3.2 “Installation Checklist”, Table 3.1; this is
part of Step 6. TB2 (on CPS-24), TB10 and all 4 NACS share a maximum of 3.0 A in standby and
6.0 A in alarm.
24 VDC Resettable Power Circuit (Four-Wire Smoke Detectors).
The power supply
provides a single 24 VDC filtered, power-limited, resettable power circuit for devices that require
resettable power (such as four-wire smoke detectors). This circuit is power-limited, but must be
supervised. To provide supervision, install a UL-listed end-of-line power supervision relay (such as
the System Sensor model EOLR-1) after the last device. Connect the power supervision relay
normally open contact in series with an Initiating Device Circuit (IDC). The four-wire power
circuit energizes the power supervision relay. When you reset the system, the control panel removes
power from these terminals for approximately 15 seconds.
!
w
WARNING:
Battery contains sulfuric acid which can cause severe burns to the skin and eyes, and can destroy
fabrics. If contact is made with sulfuric acid, immediately flush skin or eyes with water for 15 minutes
and seek immediate medical attention.
!
WARNING:
Do not connect the Battery Interconnect Cables (P/N 75560 and 75561) at this time. Make this
connection AFTER initial system primary powerup. Follow sequence of steps in Section 3.2
“Installation Checklist”, Table 3.1; this is Step 16.
CO
M
CO
M
+
5V
A
U
X
+24
V
AU
X
TB3
- Battery Connection
Battery (-)
Battery (+)
Figure 3.15 CPS-24/E:
DC Power Connections
C
PS-
24
-D
C.
wm
f
Non-resettable
Power
CP
U2-
64
0-
DCOut.wmf
Resettable
Power
Figure 3.16 Power Supply DC Outputs - TB10
