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Troubleshooting l 6-13
6
Troubleshooting
Problem
P23 The MDC conveying
blower exceeded the full load
amps rating for the blower
motor. This is a passive alarm
so the dryer will continue run-
ning, but the material convey-
ing function will stop.
P25 RTD Integrity – If the
process RTD is faulty.
Possible cause
The MDC blower has mechanically
failed or is unable to rotate freely.
The MDC blower has failed electri-
cally.
The overload is set incorrectly.
The MDC conveying blower has
exceeded the full load amps rating
for the blower motor.
The connection in the electrical
enclosure for the process RTD is
loose.
The connection of the RTD plug on
the control board is loose.
The process RTD has failed.
Solution
With the power removed, check the
MDC blower for mechanical failure
and free rotation. Replace if neces-
sary. Wait 3 to 15 minutes with
power on until the dryer indicates the
overload condition has cleared then
try to restart the dryer.
With the power removed, check the
MDC blower for electrical shorts or
open circuits. Replace if necessary.
Wait 3 to 15 minutes with power on
until the dryer indicates the overload
condition has cleared then try to
restart the dryer.
With the power removed, check the
overload settings and confirm that
the settings match the full load amps
listed on the conveying blower
motor. Wait 3 to 15 minutes with
power on until the dryer indicates the
overload condition has cleared then
try to restart the dryer.
Press alarm acknowledge and wait 2
to 3 minutes for the overload to auto-
matically reset. If the alarm condi-
tion occurs again, have a qualified
electrician check the current draw to
the motor.
Check the RTD plug connection and
tighten if needed.
Check the plug connection and tight-
en if needed.
Replace the process RTD.
Passive Alarms