Honeywell S7800A1142 Manual page 5

4. For Recommended grounding practices, see Table 2.
5. For KDM: The KDM is powered from a low voltage,
energy-limited source. It can be mounted outside of a
control panel if it is protected from mechanical damage.
Application
Keyboard Display Module
Data ControlBus™ Module
Remote Reset Module
Communications Interface ControlBus
Module™
13 Vdc full wave rectified transformer
power input.
Ground Type
Signal ground (KDM, Data ControlBus™
Module, Communications Interface
ControlBus Module™).
6. Recommended wire routing:
a. ControlBus:
(1) Do not route the ControlBus cable in conduits
that carry line voltage circuits.
(2) Avoid routing the ControlBus cable close to
ignition transformer leadwires.
(3) Route the ControlBus cable outside of conduit if
properly supported and protected from damage.
b. Remote Reset:
(1) Do not run high voltage ignition transformer wires
in the same conduit with the Remote Reset wir-
ing.
(2) Do not route Remote Reset wires in conduit with
line voltage circuits.
7. Maximum wire lengths:
a. KDM: The maximum length interconnecting wire is
4000 ft (1219m).
b. Remote Reset leadwires: The maximum length wire
is 1000 ft (300m) to a Remote Reset push-button.
8. Install all electrical connectors.
9. Restore power to the panel.
Table 1. Recommended Wire Size and Part Number.
Recommended Wire Size
22 AWG two-wire twisted pair with
ground, or five-wire.
22 AWG two-wire twisted pair with
ground, or five-wire.
22 AWG two-wire twisted pair, insulated
for low voltage.
22 AWG two-wire twisted pair with
ground.
18 AWG wire, insulated for voltages and
temperatures for given applications.
Table 2. Recommended Grounding Practices.
Use the shield of the signal wire to ground the device to the signal ground terminals
[3(c)] of each device. Connect the shield at both ends of the daisy chain to ground.
5
7800 SERIES S7800A1142 KEYBOARD DISPLAY MODULE
NOTE: A 13 Vdc power supply must be used any time more
than one KDM is used. A maximum of two KDM, Data
ControlBus™ Modules or S7810B Multi-Drop Switch
Modules are allowed in any combination.
Recommended Part Number
Belden 8723 shielded cable or equivalent.
Belden 8723 shielded cable or equivalent.
—
Belden 8723 shielded cable or equivalent.
TTW60C, THW75C, THHN90C
Recommended Practice
S7800 KEYBOARD DISPLAY MODULE
(MOUNTED ON 7800 SERIES RELAY MODULE)
3
1
2 3
120 OHM
RESISTOR
120 OHM
RESISTOR
1
2 3
1
THREE-WIRE SHIELDED CABLE MAY BE REQUIRED. TWO 120
OHM TERMINATING RESISTORS ARE REQUIRED FOR
CONNECTIONS OVER 100 FEET (30 METERS). CABLE SHIELD
MUST BE TERMINATED TO EARTH GROUND AT BOTH ENDS.
IF SHIELDED CABLE IS NOT USED, TWISTED PAIR WIRE
MUST BE USED.
2 WHEN CONNECTING THE KEYBOARD DISPLAY MODULE, DATA
CONTROLBUS MODULE, OR REMOTE RESET MODULE EXTERNAL
FROM THE CONTROL CABINET, APPROPRIATE MEASURES MUST
BE TAKE TO MEET EN60730 SAFETY LOW VOLTAGE
REQUIREMENTS (SEE APPROVALS).
3 TERMINALS OF 203541 5-WIRE CONNECTOR.
Fig. 5. Wiring the Keyboard Display Module.
MOMENTARY
PUSH BUTTON
SWITCH
4
5
1
1
2
QS7800 COMMUNICATIONS
INTERFACE CONTROLBUS
MODULE, MOUNTED IN
Q7700 COMMUNICATIONS
INTERFACE MODULE
M1990G
65-0288-1