Parker TWP/TWB201, User Manual

Page: 79 / 83

TWP/TWB201 – TWP/TWB7501
79
TROUBLESHOOTING
Dryer not operating; no lights on
- Blown control fuse: replace fuse.
- No power: apply correct power, verify quality of power source.
- Controller inoperative: replace controller.
- Control transformer defective: replace transformer.
- Program crashes: replace SD card.
Power light on, other lights off, dryer does not operate
- Cycle has not been initiated: press start button.
Dryer not operating; lights on, dryer does not switch
- Control air valve is closed: open control air valve; check condition of control air filter element.
- No air supply to dryer inlet: connect air supply.
- Dryer in Power Saving State: Disable Dewpoint Demand to go back to a standard timing cycle.
No heat in regenerating bed
- Regenerating tower will not blow down: dryer not sequencing or in dewpoint demand mode: see above.
- Bad output, solenoid, or exhaust: replace part or correct issue.
Dryer cycles, no heat
- Dryer in heatless backup mode: switch to heated mode and press start button.
- Overtemp shutdown engaged: Check setting and press reset; if overtemp shuts down dryer again
consult factory.
- Thermocouple disconnected or defective: reconnect or replace.
- Purge flow set to low: adjust purge setting to spec (TWP dryers only).
Insufficient Heat
- Low purge flow: adjust purge setting to spec (TWP dryers only).
- Clogged muffler: clean, replace, or remove.
- Moisture load too high: adjust dryer inlet air flow conditions to within spec.
- Defective thermocouple or controller: replace.
High Outlet Dewpoint or Moisture Downstream
- Dryer not cycling: see dryer not operating.
- Insufficient or no heat: see above.
- Incorrect purge rate: adjust purge setting to value specified on purge tag or manual.
- Capacity of dryer exceeded: adjust inlet flow rate, inlet air temperature, and inlet air pressure to within
specified operating conditions for the model.
- Liquid water present at dryer inlet: check water level in separators, receivers, prefilters, and operation of
associated y-strainers and auto drains. Check condition of filter elements or check differential
pressure gauges.
- Desiccant worn out, contaminated, or insufficient quantity: replace desiccant or add correct amount.
- Reduced regeneration: see Back Pressure In Regenerating Tower .
- Leaking bypass valve: replace valve.
- Undried air from another source mixing downstream of dryer: remedy.