QS7800B NETWORK INTERFACE CONTROLBUS™ MODULE FOR MULTI-DROPPING 7800 SERIES RELAY MODULES
3. Installer must be a trained, experienced service
technician.
a. Allow for an additional 2-1/2 inches (64 mm)
minimum below the Network Interface Unit for
electrical connector installation.
b. Allow for an additional 1-1/2 inches (38 mm)
minimum on each side for electrical housing cover
insertion and wiring.
4. Check out the product after installation, as provided in
the Q7700 Network Interface Unit instructions, form 63-
2278 and S7810B instructions, form 65-0228.
5. Make sure that only the manufacturer makes repairs.
6. If trouble develops, disconnect the equipment from the
modem and determine the cause of the fault.
Reconnect only when the problem is corrected.
6. Remove the ControlBus™ Module using the wire loop;
grasp the ControlBus™ Module firmly and pull the
module from the Network Interface Unit.
WIRING
WARNING
Can cause severe injury, death or equipment
damage.
.Electrical Shock Hazard.
Wiring Requirements
Disconnect power supply before beginning installation
to prevent electrical shock and equipment damage.
More than one power supply disconnection can be
involved.
WARNING
Can cause severe injury, death or equipment
damage.
Electrical Shock Hazard.
1. Wiring must comply with all applicable codes,
ordinances and regulations.
2. Refer to Fig. 6 for proper system wiring.
3. Do not plug or unplug any Network Interface Unit
ControlBus™ Module or electrical connectors with
the power on. Make sure that power is off to protect
against equipment damage.
Humidity
Install the Network Interface Unit where the relative humidity
never reaches the saturation point. The Network Interface
Unit is designed to operate in an 85 percent relative humidity
continuous noncondensing moisture environment.
Condensing moisture can result in improper operation.
1. All wiring must comply with all applicable electrical
codes, ordinances, and regulations.
2. Recommended wire size and type for ControlBus™
communication is shielded 22 AWG twisted pair cable
(Belden 8723 or equivalent). Terminal identification
numbers and letters are shown in Table 1.
Vibration
Do not install the Network Interface Unit where it can be
subjected to excessive vibration in excess of 0.5G continuous
maximum vibration.
Table 1. QS7800B and S7810B Terminals
and Identification.
Weather
The Network Interface Unit is not designed to be weather
tight. When installed outdoors, provide protection for the
Network Interface Unit.
QS7800B
Terminals
S7810B
Terminals
Signal
Multi-Drop Data+
Multi-Drop Data-
Multi-Drop Ground
3. Wire Routing:
a
b
c
7
8
6
Mounting the Network Interface Plug-in Card
For installation dimensions, see Fig. 1.
1. Mount the ControlBus™ Module in the Network
Interface Unit (see Fig. 2). Do not mount the Network
Interface Unit with the Interface ControlBus™ Module
edge connector slots facing down.
2. Insert the ControlBus™ Module with the electrical
connector facing out from the Network Interface Unit.
3. Grasp the ControlBus™ Module and align the plug-in
edge card with the connector in the bottom of the
Network Interface Unit.
a. Do not route the ControlBus™ cable in conduit with
line voltage circuits.
b. Do not route the ControlBus™ cable close to the
ignition transformer.
c. Route the ControlBus™ cable outside of conduit if
properly supported and protected from damage.
d. Route the ControlBus™ cable so that all devices are
connected in a daisy chain configuration. See Fig. 6.
4. Maximum wire lengths can be 4000 ft (1219 m) for the
ControlBus™ RS-485 interface under ideal conditions.
4. Firmly insert the ControlBus™ Module into the Network
Interface Unit.
5. Select a location that can support the Network Interface
Unit. Be sure to allow clearances for servicing, installing
and removing the wiring compartment cover, Network
Interface Unit cover, electrical connectors and
ControlBus™ Modules.
Procedure
1. Refer to Fig. 6 for proper wiring.
2. Be sure that power is removed from the control panel by
opening the main disconnect before beginning wiring to
the electrical connectors. More than one disconnection
can be involved.
3. Select the location of the Network Interface Unit to be
mounted:
3
65-0227—2
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