Setting Up Network Communications - Nailor 37S Manual

Connections and wiring
Use the following principles when connecting a controller to an MS/TP network:
• Connect no more than 128 addressable BACnet devices to one MS/TP network. The devices can be any mix of controllers
or routers.
• To prevent network traffic bottlenecks, limit the MS/TP network size to 60 controllers.
• Use twisted pair, shielded cable with capacitance of no more than 51 picofarads per foot for all network wiring. Belden
cable model #82760 meets the cable requirements.
• Connect the -A terminal in parallel with all other - terminals.
• Connect the +B terminal in parallel with all other + terminals.
• Connect the shields of the cable together at each mid line controller. For EZvav controllers use the S terminal.
• Connect the shield to an earth ground at one end only.
• Use repeater between every 32 MS/TP devices or if the cable length will exceed 4000 feet (1220 meters). Use no more
than four repeaters per MS/TP network.
• Place a surge suppressor in the cable where it exits a building.
End of line termination switches
The controllers on the physical ends of the EIA-485 wiring segment must have end of line termination added for proper network
operation.
• For controllers at the end of the network set the EOL switches to On
• For mid line controllers at the end of the network set the EOL switches to Off
Network bulbs
• EZvav controllers include network bulbs located near the MS/TP network connector. These bulbs serve three functions:
• Removing both bulbs will disconnect the controller from the MS/TP network.
• If one or both bulbs are lit, it indicates the network connection or controller power is not properly wired.
• If the voltage or current on the network exceeds safe levels, the bulbs may open and protect the controller from damage.
Bulbs are illuminated If one or both bulbs are illuminated, it indicates the network is not phased correctly. The ground potential of
the controller is not the same as other controllers on the network. The brighter the isolation bulbs on a controller are illuminated,
the closer that controller is to the source of the problem. Remove power and check the network and power connections.
Bulbs are open If one or both bulbs are open – as tested with an ohm meter – it indicates the voltage or current on the network
exceeded safe levels. Correct the conditions and replace the bulbs.
Bulbs not inserted correctly One lead from one or both of the bulbs are not inserted into the socket.
Setting up Network Communications
Set the network communication settings before placing a controller on the network. Setting network settings requires entering
Password 2 which is described in the topic Getting started with configuration on page 14.
Procedure to set up network communications
PROCEDURE
1 Starting display.
Date: 10-2016 Supersedes: 7-2016
Nailor reserves the right to change any information concerning product or specification without notice or obligation.
Installation and Operation Manual
1. Start at the temperature display.
∆
2. Press the and
• If Password 2 is not required, the display changes to
CNFG.
• If required, enter Password 2. The display changes to
CNFG when Password 2 is correct.
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EZvav Digital Controls
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STEPS
buttons together.
STE DISPLAY

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