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Operation, Installation, and Maintenance Manual
LW-401
Standard Components
A standard four zone LW-401 has one
module—the main board. An expander
board is added to provide four additional
zones, when needed.
MAIN BOARD
The Main board of the LW-401 contains the
intelligence for the system and performs all
of the input/output processing as listed
below:
• Two supervised Notification Appliance
Circuits provide 24 VDC at 1.5 amps.
Each circuit operates Class B (Style Y)
and can be independently programmed
to operate a number of different ways
(Non-Coded, March Time, Temporal, or
Simple Zone Code).
• Two Form C relays rated at 30 VDC at
1 amp resistive, 30 VAC at 500mA
resistive. These relays are for Alarm and
Trouble operation.
• A dual mode battery charger that
Figure 2
LW-401 Front Panel
provides float and constant current
modes of charging sealed lead acid
batteries (15 Amp-Hour maximum).
• Nonvolatile storage of system configu-
ration so that configuration remains
intact during loss of system power.
• Four supervised power limiting
Initiating Device Circuits. Each circuit
operates Class B (Style B) and can be
independently programmed to operate
as an Automatic Alarm input, a Verified
Alarm input, a Supervisory input, or a
Generic input. Each initiating device
circuit can use an unlimited number of
manual shorting-type devices.
• CPU Fail LED.
DISPLAY
The LW-401 display, shown in Figure 2,
provides the user with the necessary inter-
face to operate the fire detection system in
Normal, Test, and Program modes.
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