7800 SERIES S7800A KEYBOARD DISPLAY MODULE
5
65-009
0-6
A
A
B
B
C
C
(GND)
+13
VDC
RESET
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.
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.
Table 1. Recommended Wire Size and Part Number
.
Ap
plication
Recommended Wire Size Recommended Part Number
Keyboard Display Module
22 AWG two-wire twisted pair with
ground, or five-wire.
Belden 8723 shielded cable or equivalent.
Data ControlBus™ Module
22 AWG two-wire twisted pair with
ground, or five-wire.
Belden 8723 shielded cable or equivalent.
Remote Reset Module
22 AWG two-wire twisted pair, insulated
for low voltage.
-
Communications Interface ControlBus
Module™
22 AWG two-wire twisted pair with
ground.
Belden 8723 shielded cable or equivalent.
13 Vdc full wave rectified transformer
power input.
18 AWG wire, insulated for voltages and
temperatures for given applications.
TTW60C, THW75C, THHN90C
Table 2. Recommended Grounding Pract
ic
es
.
Ground
Typ
e Recommended Prac
tic
e
Signal ground (KDM, Data ControlBus™
Module, Communications Interface
ControlBus Module™).
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.
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
S7800 KEYBOARD DISPLAY
MODULE
(MOUNTED ON 7800 SERIES RELAY
MODULE)
3
1
2 3
4
5
120
OHM
RESISTOR
1
120
OHM
RESISTOR
1
2
MOMENTARY
PUSH
BUTTON
SWITCH
is 1000 ft (300m) to a Remote Reset push-button.
8. Install all electrical connectors.
9. Restore power to the panel.
1
2
3
QS7800
COMMUNICATIONS
INTERFACE
CONTROLBUS
MODULE, MOUNTED
IN
Q7700
COMMUNICATIONS
INTERFACE
MODULE
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.
M1990G
Fig. 5. Wiring the Keyboard Display Module.
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