Kmc-controls FlexStat Operation Guide User Manual download pdf (Page 39)

FlexStat 39 Operation Guide, Rev. R

Wiring Issues

Installation Wiring Considerations

CAUTION

To avoid damage from ground loops and other

communication issues in networked FlexStats,

correct phasing on network and power

connections on ALL the networked controllers

is critically important.

• Because of the many connections (power,

network, inputs, outputs, and their respective

grounds or switched commons), be sure wiring is

well planned before installation of conduit!

• For information on principles and good practices

when connecting an MS/TP network, see Tipsfor

Connecting24-VoltPowerApplicationNote

(AN0604D).

• To prevent excessive voltage drop, useaconduc-

torsizethatisadequateforthewiringlength!

Allowplentyof“cushion”toallowfortransient

peaksduringstartup.

• Make sure that conduit for all wiring has ad-

equate diameter for all necessary wiring. Using

1-inch conduit and junction boxes is recom-

mended!

• Use external junction boxes above the ceiling or

in another convenient location as needed to make

connections that run to the FlexStat’s junction

box.

• Using multiple conductor wires for all inputs

(e.g., 8 conductor) and outputs (e.g., 12 conduc-

tor) is recommended. Grounds for all the inputs

can be combined on one wire.

Troubleshooting Wiring Problems

• Review the wiring information in the relevant

FlexStat installation guide.

• Remove the FlexStat from the backplate and

inspect the terminals for loose or shorted wires.

• Use a voltmeter and ohmmeter to check the

terminals for expected values. See the illustration

below and the Connections and Wiring section of

the relevant FlexStat Installation Guide.

NOTE: Voltage on the BACnet MS/TP terminals

changes according to the signals (passing

of the token) between controllers on the

network. No voltage may indicate a bad

connection or simply no active network.

NOTE: Wiringmustbeadequatetoavoid

excessivevoltagedroponlong

runs!Allowplentyof“cushion”in

measurementsAmetermaybetooslow

toregistertransientdipsorpeaksduring

startup.See Wiring Issues on page 39.

• Check the wiring at the connected devices.

–A

IN4

IN3

GND

IN2

Common/–/C

Phase/ /R

Analog 9

GND 7–9

Analog 8

Analog 7

Relay 6

SC 4–6

Relay 5

Relay 4

Relay 3

SC 1–3

Relay 2

Relay 1

Outputs

NOTE: Values Shown Are Approximate!

BACnet

MS/TP

Network

Inputs

24 VAC

NOTE: SC = Switched (Relay) Common, Should

Have the Phase Side of 24 VAC Connected

(Wiring Inputs

and Outputs

Dependent on

Application)

24 VAC

}

10K Ohms (Thermistor)

O Ohms (Closed Contact)

0.1–0.2 VDC (If Network

Token Passing is Present)

}

24 VAC

(Jumper to

Turn Device

On Manually)

NOTE: BAC-1xxx63 Backplate Terminals Shown

with FlexStat Removed; Outputs and Inputs

Vary According to Application

Resistance

Dependent

on Device

Terminal Voltages and Resistances with FlexStat REMOVED from Backplate

CAUTION

Do not mistakenly connect 24 VAC to an analog

output ground. This is not the same as a relay’s

switched common. See the backplate’s terminal

label for the correct terminal.

CAUTION

Relays are for Class-2 voltages (24 VAC) only.

Do not connect line voltage to the relays!

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Kmc-controls FlexStat Operation Guide User Manual Page 39

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