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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. Pressing
the ALARM RESET pushbutton will deactivate the alarm horn and light.
5. If the OMRON controller faults, the optional redundant high temperature safety device opens,
or the process heater safety switch opens, a process 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 fault
condition still exists, the dryer will not restart.
6. If the process blower overloads trips, a process blower fault is generated. “PROC BLWR” 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.
Dehumidifying Dryers Chapter 4: Operation 30 of 53