Installing the Control Panel Installation
NFS-640 Installation Manual P/N 51332:B1 12/01/2003 39
3.5.10 APS-6R Auxiliary Power Supply Connections
If an optional APS-6R power supply is installed in the cabinet, connect it with no power applied;
follow sequence of steps in Section 3.2 “Installation Checklist”, Table 2; this is Step 4. For all
information pertaining to these connections see the APS-6R Instruction Manual.
3.5.11 External DC Power Output Connections
Terminal TB7 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 2; this is part of
Step 6.
Figure 15 Power Supply DC Outputs - TB7
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 A77-716B) 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.
Connect external field wires to the power supply terminals TB7 RESET(+)and(–) to provide up to
1.25 A of current for powering four-wire smoke detectors. See Figure 15 above.
24 VDC Non-resettable Power Circuit. The power supply provides one 24 VDC filtered,
power-limited, non-resettable power output, capable of up to 1.25 A. Use this circuit to power
devices that require low-noise 24 VDC power (such as annunciators or the TM-4).
Connect external field wires to power supply terminals TB7 NONRST(+)and(–) to provide up to
1.25 A of non-resettable current for powering external devices such as annunciators. See Figure 15
above.
+ – + –
TB7
Non-resettable
Power
nfs640-dcout.cdr
Resettable
Power
!
CAUTION: During system reset, power remains at terminals TB7 NONRST(+)and(–).
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