867 INSTALLATION GUIDE | DIGITAL MONITORING PRODUCTS
3
ADDITIONAL INFORMATION
Wiring Specifications
DMP recommends using 18 or 22 AWG for all LX‑Bus and Keypad Bus connections.
The maximum wire distance between any module and the DMP Keypad Bus or LX‑Bus
circuit is 10 feet. To increase the wiring distance, install an auxiliary power supply, such
as a DMP Model 505‑12. Maximum voltage drop between a panel or auxiliary power
supply and any device is 2.0 VDC. If the voltage at any device is less than the required
level, add an auxiliary power supply at the end of the circuit.
To maintain auxiliary power integrity when using 22‑gauge wire on Keypad Bus circuits,
do not exceed 500 feet. When using 18‑gauge wire, do not exceed 1,000 feet. Maximum
distance for any bus circuit is 2,500 feet regardless of wire gauge. Each 2,500 foot bus
circuit supports a maximum of 40 LX‑Bus devices.
For additional information refer to the LX‑Bus/Keypad Bus Wiring Application Note
(LT‑2031) and the 710 Bus Splitter/Repeater Module Installation Guide (LT‑0310).
Power Supply
The bell power must be supplied by a regulated, power limited, auxiliary power supply
listed for Fire Protective Signaling with a maximum output of 5 Amps at 12 or 24 VDC.
The power supply output positive connects to module Terminal 1 and power supply
output negative connects to module Terminal 2.
The power supply must be supervised and provide a set of Normally Closed trouble
contacts that connect to the Power Supply Monitor zone (Terminals 7 and 8) on the
867 module. An open on the supervision circuit causes the Power Supply Monitor LED
to light and an open condition to be reported on the panel supervisory zone address.
LED Operation
For normal operation, all notification devices are connected in parallel on the Style W
circuit. An included 10k Ohm EOL resistor installs at the last device in the circuit. The
Style W circuit LED operation is defined as follows:
•
Normal
—No LEDs light and the module reports a normal condition on the
supervisory zone address.
•
Open or Short
—The TRBL LED lights and the module reports an open
condition on the supervisory zone address.
•
Ground Fault
—The TRBL and GND FAULT LEDs light and the module reports
an open condition on the supervisory zone address.
Bell Silence Switch
The Bell Silence slide switch allows technicians to test or perform maintenance on
the fire system without sounding the fire alarm notification devices. When the switch
is placed in the Bell Silence position, the module TRBL LED turns on and an open
condition is reported on the supervisory zone address. After testing, returning the
silence switch to the Bell Normal position returns the module to normal operation.
5
6
7
8
4
3
2
1
BELL
+ IN
BELL
- IN
BELL
+ OUT
BELL
- OUT
BELL
TRBL
BELL
TRBL
PS
MON
MON
ATN
BELL SILENCE
BELL NORMAL
MODEL
867
PS
TRBL
TENS
ONES
TENS
SUPERVISORY ADDR
BELL ADDRESS
ONES
RING
STYL
DATA
RED
BLA
CK
BELL
TRBL
GND
FAULT
Trouble and Ground Fault LEDs
Power Supply Trouble and Data LEDs
Ring Style Header
Bell Address Switches
Supervisory Address Switches
Bell Silence Slide Switch
From 505-12 DC +
To N/C Trouble Contact
To LX-Bus
From 505-12 DC –
To Trouble Indicator (optional)
To Trouble Indicator (optional)
To N/C Trouble Contact
+
–
To Bell Output –
To Bell
10k Ω EOL
S
S
S
S
S
=
Supervised Circuit
All circuits are power limted.
Figure 4: Wiring Connections
