AEC TD4-400-500 Floor Mount Dryer - Manual (Page 12)

OPERATING MANUAL - TD4-400-500 DRYERS
Revision 10/3/01
Page 11
Basic Trouble-Shooting
Our new MICROPROCESSOR Electrics are designed for
quick diagnosis of problems. The microprocessor is designed
to display error codes and faults that indicate the nature of the
failure that has occurred. The most common errors and faults
are discussed in the Microprocessor Control Instruction
Manual and should be consulted in the event of a failure.
The following steps should be taken before proceeding with
other diagnostic steps.
1. Check the Power Circuit:
a. Incoming power fuses or circuit breaker
b. Check all dryer fuses with multimeter.
c. Is power supplied to the unit?
d. Check heater continuity using a volt/ohmmeter.
2. Compressed Air:
a. Is compressed air connected with at least 70 PSI
b. Check water separator and drain if necessary
c. Pressure gauge should read 70 PSI
3. Air Flow Circuit:
a. Ensure Zone Valve position corresponds to the
regeneration cycle by comparing the position of the Zone
Valve to the ZONE position lights on the dryer control
panel (See pg. 12 for details).
b. Make sure that all process air hoses are connected, not
crushed, and free from obstructions.
c. Inspect filter and make sure cover is tight and the filter
element is clean.
4. Control Circuit:
a. Using the MICRO Display panel ZONE indicator
lights as a guide for the dryer regeneration cycle, check
that all outputs to heaters are proper for the part of the
regeneration cycle that the machine is in. (Output
voltage to heater relays is approx 4.5v)
5. Operating Conditions:
a. Check the process temperature. It should not be set
below 140° F (60° C) because the unit will go into high
temp alarm.