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SMD Series Dehumidifying Dryers Page 41
Control Operation 6
6-1 Controller Operation
(Without 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.
Note: The relay screen which contains the Alarm Display Messages is
located inside the controller enclosure. For a list of Alarm Display
Messages, see Section 6-3 on Page 44.
WARNING!
Do not attempt to check the Alarms on the Controller
located within the unit enclosure unless you are a qualified
electrician!
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:
3-1. The process heater is turned on and controlled by the
E5CN controller.
3-2. The solenoid valve opens and air flows through the
dryer.
4.) If the OMRON controller faults, the optional redundant high
temperature safety device opens, or the process heater safety
switch opens, a heater fault is generated. “HIGH TEMP” is
displayed on the relay screen. The alarm horn and light are
activated. The process heater and solenoid valve are turned
off.
Turn the OFF-ON-START switch to the START position to
deactivate the alarm light and restart the dryer. If the fault
condition still exists, the dryer will not restart.
5.) If the pressure in the system drops below 15 PSI for 10
seconds or more, the alarm will sound. The process heater and
solenoid valve will shut off.