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Dehumidifying Dryers Chapter 4: Operation 38 of 59
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 overload 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.
Reset the motor overload and turn the Off-On-Start switch to the START position to
restart the dryer.
7. The valve position limit switch enables the right bed heater and provides an input
signal to the programmable relay when actuated by the cam lobe. Each heater is ON-
OFF controlled by the OMRON E5C2 controller.
8. Upon completion of the HEAT portion of the regeneration sequence, the regen
heaters are disabled by the programmable relay and the COOL time begins.
9. Once the COOL time has expired, the valve motor is turned on until the cam switch
makes a transition. Upon making a transition, the timing sequence is restarted for the
new bed.
10. When no fault conditions exist, the display reads “SYSTEM NORMAL”.
11. When a dew point fault is generated by the optional dew point controller, the alarm
horn and light will activate. The alarm light will flash, indicating a non-critical fault.
Press Alarm Reset to deactivate the alarm until the next dew point fault occurs.
12. The top 2 lines of the display show the HEAT and COOL times (in minutes) for the
regeneration sequence. Changes to these times can be made by the operator as
follows:
a. Press the up or down arrow until the cursor is positioned at the number to be
changed.
b. Press the “+” key to increment the number, or the “-“ key to decrement the
number.
c. Press the “OK” key to accept the value and write to the relay memory.
OR
d. Press the “ESC” key to cancel the changes.
Note: A change will NOT take effect until step 12-c is done.
13. The dryer is shut off by turning the control power switch to the OFF position.
14. Refer to Schematic drawing A0566087 enclosed in the control enclosure.