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Dehumidifying Dryers Chapter 4: Operation 37 of 59
Controller Operation (With Optional Alarm Horn & Reset Button)
1. Turn the disconnect on the control panel to the ON position. Power is applied to the
voltage line fuses, line side of the control power switch and the temperature
controller.
2. Turn the control power switch to the ON position. Power is applied to the
programmable relay and dew point controller. The valve will move to the start
position as follows:
a. The valve motor rotates until the cam switch makes 2 transitions.
b. If the cam switch does not make a transition within 10 seconds, a valve
motor fault is generated. “VALVE MTR” is displayed on the relay screen,
the alarm horn and light are activated. The valve motor, heaters, and blower
shut off. Pressing the ALARM RESET pushbutton will deactivate the alarm
horn and light.
Cycle control power to restart the dryer.
Note: The relay screen which contains the Alarm Display Messages is located
inside the controller enclosure. For a list of Alarm Display Messages,
see Page 35.
WARNING! Do not attempt to check the Alarms on the Controller located within the
unit enclosure unless you are a qualified electrician!
c. The valve will normally complete one full cycle (revolution).
If the drying process shuts down due to an alarm, the dryer has been setup to
have the following operational features:
• The bed in process at power-down will remain in process.
• The bed in regeneration at power-down will remain in regeneration.
• The regeneration timing cycle will restart from the beginning.
3. Once the control power is on and no fault conditions exist, turning the Off-On-Start
switch to the START position will start the dryer as follows:
a. The process heater is turned on and controlled by the E5CN controller.
b. The process/regen blower is started.
c. The regen heater is turned on and the regeneration timing sequence is
initiated. The regen heater is controlled by the E5C2 controller. Default
timing for regeneration is 35 minutes for HEATING and 30 minutes for
COOLING.
4. If either the left or right bed safety temperature switch opens, a regen heater fault is
generated. “HIGH TEMP” is displayed on the relay screen. The alarm horn and
light are activated. The process heater, regen heater, and process/regen blower are
turned off. Pressing the ALARM RESET pushbutton will deactivate the alarm horn
and light.
Turn the Off-On-Start switch to the START position to restart the dryer. If the
switch is still open, the dryer will not restart.