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350-2100 cfm Dryers Chapter 4: Control Panel 23 of 58

; If one or two of a heater's three meters indicates a low reading, a burned-out heater is

likely, and should be serviced.

4-3 PLC Control

These dryers are equipped with an Omron C28K programmable logic controller (PLC).

The "brick" type PLC has 28 I/O points - 16 inputs and 12 outputs.

All inputs are 115 VAC, except for the 24 VDC input #1 from the dewpoint circuit board.

All programming and logic is factory installed on an EPROM, and cannot be modified.

A battery backup retains the programming during power failures.

Battery life is 5 years at room temperature.

If the alarm indicator blinks intermittently, replace the battery [P/N A0544701] within one

week.

4-4 Process Air Temperature Controller

Standard ACS dryers use a microprocessor based PID control for maintaining process air

temperature. The controller is a modular, self-contained unit that can slide from its mounting

housing. All parameters except for the process air setpoint are factory set and adjusted; no

field adjustment to the internal controls is normally necessary.

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CDA CST Installationshandbuch Seite 24