INSTALLATION, START-UP & MAINTENANCE MANUAL
MODEL NO.: SD-820 / SD-1710
REV 1 – AUGUST 03,.2001
Page 15
SECTION 3
3.2.2 Dryer operating sequence (No control or alarm option) – (Continued)
STEP 6 RIGHT CHAMBER REPRESSURIZATION.
- Keep energized EV-1R.
- De–energize EV-2L closing right chamber dump/exhaust valve.
- The repressurization timer begins a countdown of 45 seconds.
- Inlet valve remains in current position.
The dryer has completed 1 full cycle and will repeat steps 1 through 6 until power is
removed from the control panel.
3.2.3 Operating sequence (DDS Option)
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SD-820-DDS – SD-1710-DDS and all “LDP” heatless air dryers use a PLC
as its standard controller. In the event of a power failure, the exhaust valves will close
and dryer will pressurize both chambers. Since this control panel uses retentive
programming, the dryer will return to the same step in the cycle dryer was in before
power was lost. (See NOTE 2)
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
If not in DDS mode:
- Energize EV-2R opening right chamber dump/exhaust valve.
If in DDS mode and dewpoint is better than hygrometer setpoint:
- EV-2R does not energize.
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 repress timer begins a countdown of 45 seconds (See Note 1)
- Inlet valve remains in current position.
- When repressurization time has passed, go to STEP 4
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