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6-1
Series 1 Portable Chillers, PLC Control
UGH017/0500
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Before Beginning . . . . . . . . . . . .6-2
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A Few Words of Caution . . . . . .6-3
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Identifying the Cause
of a Problem . . . . . . . . . . . . . .6-3
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Answering Alarms . . . . . . . . . . .6-4
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Control Problems . . . . . . . . . . . .6-6
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Alarm Conditions . . . . . . . . . . . .6-8
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Checking and Replacing
Switches . . . . . . . . . . . . . . . .6-16
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Checking the Pressure
Transducer . . . . . . . . . . . . . . .6-17
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Checking the Temperature
Transmitter and RTD . . . . . . . .6-18
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Replacing the RTD . . . . . . . . . .6-20
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Replacing the Temperature
Transmitter . . . . . . . . . . . . . . .6-21
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Removing Pump Components .6-22
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Replacing Overload Modules .6-23
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Replacing Fuses . . . . . . . . . . .6-24
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Replacing the Contactor . . . . .6-25
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Replacing the PLC . . . . . . . . . .6-26
T
ROUBLESHOOTING