Dri-Air Industries HP4-X 400 - 750 Kullanım Kılavuzu - Sayfa 12

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DETAILED DIAGNOSIS &
TROUBLESHOOTING
Page 12
DRI-AIR
Diagnosing problems with the dryer is very easy, as the
Microprocessor Control Module performs numerous internal
diagnostic checks upon start-up and continually monitors
critical parameters during operation. When a fault or failure is
detected, the dryer shuts down and an Error Code is displayed
on the dryer's control panel.
Error codes are displayed on the control panel by Err
appearing in the left display and a three digit number
appearing in the right display. Each code corresponds to a
specific type of failure. These codes are discussed in detail in
the Microprocessor Control Instruction Manual.
If the temp will not reach set point, check the following:
1. Check heater fuses with multimeter.
2. Check blower rotation by utilizing procedure detailed on
page 8 of Installation Procedures.
3. Check location of process air thermocouple. Ensure
that is positioned so that the tip is centered in the inlet
port to the hopper.
4. Check dryer's internal air flow by the following:
a. Ensure that Zone Valve Air Diversion Valve is
positioned correctly.
b. Ensure filter element is not blocked or choked
with dust/material.
c. Ensure air flow to hopper is sufficient by
removing process air hose from dryer and
checking flow from dryer.
If the temp exceeds the set point, check the following:
1. Remove the hose from the top of the hopper to check air
flow. There should be air flow out of the hopper with a
suction on the hose. If there is little or no flow, check the
inlet hose.
2. Inspect the filter to make sure that it is clean and not
affecting the air flow.
3. Check to see if heater relay has failed on. Using an
ammeter or voltmeter, check the output lead from the
relay to the heater for power to the heater when the
Micro Display LED for that heater is off.
4. Check the Zone Valve position.
OPERATING MANUAL - HP4-X 400-750 FM DRYERS
Revision 10/8/02
INDUSTRIES, INC.