Honeywell RM7838B1013 User Manual

RM7838B,C 7800 SERIES RELAY MODULE
7 32-00199—01
Table 1. Recommended Wire Sizes and Part Numbers.
Table 2. Recommended Grounding Practices.
Application Recommended Wire Size Recommended Part Numbers
Line voltage terminals
14, 16 or 18 AWG (0.75, 1.5 or 2.5 mm
2
) copper
conductor, 600 volt insulation, moisture-resistant
wire.
TTW60C, THW75C, THHN90C.
Keyboard Display Module
KDM
a
22 AWG (0.34 mm
2
) two-wire twisted pair with
ground, or five-wire.
Belden 8723 shielded cable or
equivalent.
Data ControlBus
Module™
22 AWG (0.34 mm
2
) two-wire twisted pair with
ground, or five-wire.
Belden 8723 shielded cable or
equivalent.
Remote Reset Module
22 AWG (0.34 mm
2
) two-wire twisted pair, insulated
for low voltage.
—
13 Vdc full wave rectified
transformer power input.
18 AWG (0.75 mm
2
) wire insulated for voltages and
temperatures for given application.
TTW60C, THW75C, THHN90C.
a
The KDM, Data ControlBus Module™ (for remote mounting or communications) or Modbus™ Module must be wired in a
daisy chain configuration, (1(a)-1(a), 2(b)-2(b), 3(c)-3(c)). The order of interconnection of all the devices listed above is
not important. Be aware that modules on the closest and farthest end of the daisy chain configuration string require a
120 ohm (1/4 watt minimum) resistor termination across terminals 1 and 2 of the electrical connectors for connections
over 100 feet (ca. 30 meters).
Ground Type Recommended Practice
Earth Ground (Subbase and relay
module)
1. Use to provide a connection between the subbase and the control panel of
the
equipment. Earth ground must be capable of conducting enough current to
blow
the 15A fuse (or breaker) in the event of an internal short circuit.
2. Use wide straps or brackets to provide minimum length, maximum surface
area
ground conductors. If a lead wire must be used, use 14 AWG (2.5 mm
2
) cop-
per wire.
3. Make sure that mechanically-tightened joints along the ground path are
free of
nonconductive coatings and protected against corrosion on mating
surfaces.
Signal Ground (KDM, Data
ControlBus Module™
Use the shield of the signal wire to ground the device to the signal ground terminal
3(c) of each device. Connect the shield at both ends of the daisy chain to earth
ground.

Honeywell RM7838B1013 Specifications

General

Brand	Honeywell
Model	RM7838B1013
Category	Control Unit
Language	English