Sullair SD Series - Dryer Operating Sequence (No Control;Alarm)

INSTALLATION, START-UP & MAINTENANCE MANUAL
MODEL NO.: SD-820 / SD-1710
REV 1 – AUGUST 03,.2001
Page 14
SECTION 3
3.2.2 Dryer operating sequence (No control or alarm option)
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SD-820 –SD-1710 heatless air dryers use a PLC as its standard controller.
In the event of a power failure, the exhaust valves will close and the dryer will pressurize
both chambers. Since this control panel uses retentive programming the dryer will return
to the same step in the cycle the dryer was in before power was lost.
Energizing control panel : Power is turned ON – electrical circuit energized.
STEP 1 SELECT LEFT CHAMBER DRYING.
- De-energize solenoid EV-1R.
- Energize solenoid EV-1L.
- Inlet valve positioned for left chamber drying.
- When 3 seconds have passed, go to STEP 2
STEP 2 RIGHT CHAMBER DE-PRESSURIZATION.
- Keep energized EV-1L
- Energize EV-2R opening right chamber dump/exhaust valve.
- When regeneration time has passed, go to STEP 3
STEP 3 RIGHT CHAMBER REPRESSURIZATION.
- Keep energized EV-1L.
- De–energize EV-2R closing right chamber dump/exhaust valve.
- The repressurization timer begins a countdown of 45 seconds.
- Inlet valve remains in current position.
- When repressurization time has passed, go to STEP 4
STEP 4 RIGHT CHAMBER DRYING.
- De-energize solenoid EV-1L
- Energize solenoid EV-1R.
- Inlet valve positioned for right chamber drying.
- When 3 seconds have passed, go to STEP 5
STEP 5 LEFT CHAMBER DEPRESSURIZATION.
- Keep energized EV-1R
- Energize EV-2L, opening right chamber dump/exhaust valve.
- When regeneration time has passed, go to STEP 5