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IM00120

MSC-3 Instruction Manual

Application: Cooling tower fan with reverse acting internal PID

This setup is for a typical cooling tower fan application that requires water temperature control using a

water temperature transducer and the PID controller function provided by the MSC-3 extended features

option board. Prior to commissioning, you will need to know the type of temperature sensor signal that is

to be used (0-10V, 4-20mA etc).

Procedure

STEP 1 Complete the power wiring according to the instructions on pages 9 to 18

STEP 2 Connect the control wiring as shown.

CAUTION

Do not connect the wire

to terminal 6 yet.

The terminal conguration

should not be changed

while the MSC-3 is

enabled.

1 2 3 4 5 6 7 8 9 10 11

+5V D1 D2 D3 D4 EN COM SCN Vref IN+ IN -

MSC - 3 Control Board

MSC-3 Extended

Features Option

IN+ IN-

32 34

Water temperature

transducer

RUN

STEP 3 Connect the signal wiring from the water temperature transducer as shown. Consult the

transducer manufacturer’s literature for power supply requirements of the transducer.

Set the switches on the Extended Features Option to suit the type of signal.

Go to the G00 INPUT/OUTPUT menu and select G10 AI(32,34). Set G100 for the type of

input signal (mA or voltage). Set G101 Min Input and G102 Max Input to reect the range

of the signal, typically 4-20mA or 0-10V. For more information, see page 89.

See page 45

for additional

details

Zener MSC-3 User Manual

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