Large Dehumidifying Dryers Controls 27
Chapter 4: Controls 4-1 Controller Description and Operation
Identifying Control Panel Indicator Lights and Switches for the Standard
Controller
Switches
System OFF/ON/START Switch. This switch energizes or de-energizes control power to
the indicator panel and starts the dryer. (The controller can be energized without the dryer
running.)
Indicator Lights
Alarm Light. This feature works in conjunction with the alarm horn to warn the operator of
a high bed safety temperature, a regeneration heater fault, or a blower failure. This warning
is reset by pressing the alarm silence button.
Process Air Temperature Controller
Our dryers use a microprocessor-based PID temperature controller for maintaining process air
temperature. The controller is a modular, self-contained unit that can be removed from the
mounting housing. All parameters except for the process air set point are factory set and
adjusted; normally, no field adjustment to the internal controls is necessary.
Figure 11: Typical Process Air Temperature Controller
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