Maguire Products, Inc.
Rev. June 11, 2020
– ULTRA-600 Touchscreen
66
ULTRA By Maguire
- Ultra Low Energy Dryer
Alarms - Cause and Solution
Typically,
problems are indicated by an alarm condition on the Dryer controller’s display
with an audible alarm and a flashing strobe light. The following alarm troubleshooting
chart will describe the alarm condition and possible causes and solutions.
Alarm Display:
Troubleshooting:
BLOWER FAILURE
ALARM:01
Problem: The blower is not running.
Motor contactor overload relay has tripped. See wiring diagram on
page 103 for Blower Motor Contactor. Item # 3, overload relay on
wiring diagram. This alarm will trigger a dryer shutdown.
Solution:
Reset contactor. Check that blower motor shaft is not
locked. Check line voltage to machine; make sure voltage is not too
low which can cause an increase in amperage. Check that power
source has not lost a phase.
ALARM:02
HH NO HEAT
Problem: No heat or inadequate heat detected by the
Heating Hopper inlet RTD.
This alarm is triggered by the NH1 parameter. NH1 parameter is the
maximum time limit, in seconds, after the heat cycle begins, during
which one of the following two conditions must be detected: Either the
temperature must climb 20 degrees, or the temperature must move at
least 20 percent toward the target temperature. If neither condition is
met the “NO HEAT” alarm will sound. Such an occurrence would
signal a failure of either the heater or the airflow from the blower. This
parameter and consequent alarm protects the heater from burn out in
the event the blower fails or airflow is blocked.
Solution:
Check for airflow from the blower. Check blower inlet
obstruction, check that 2” air duct from blower to heater is not
detached, obstructed or perforated. Check 2” air duct from top of
heater to heating hopper inlet for detachment, obstruction or
perforation. Check resistance across heater. Disconnecting heater
from circuit is not necessary to measure resistance. Measurement
should read 80 ohms. See wiring diagram on page 103
. If the dryer’s
heater shorted, the result would be a trip of the breaker or fuse
supplying power to the ULTRA-600 dryer.
ALARM:03
HH SP EXCEEDED
Problem: The heating hopper air inlet temperature has
drifted above set-point.
If the Heating hopper air inlet temperature (T1a sensor) is over the
degrees specified in parameter OT1 (default 6° F or 6° C) for a time
greater than the time in seconds specified in OT1, then the alarm is
triggered and the heater output will drop by 20%. The alarm will occur
but the machine will keep running. See OT1 parameter for more
information.
Solution:
No solution is necessary under normal circumstances as
the dryer is alerting to a temperature adjustment. If this alarm
continued to repeat, contact Maguire Technical Support.
