Maguire Products VBD-150 Installation Operation & Maintenance page 65

VBD® - Vacuum Dryer®
*** ALARM:04 ***
TEMP. OVER TARGET
Press Any Button
To SILENCE alarm
*** ALARM:08 ***
NO VACUUM
Press Any Button
To SILENCE alarm
*** ALARM:09 ***
RETEN. NOT PRESENT
Press Any Button
To SILENCE alarm
*** ALARM:11 ***
RTD FAILURE
Press Any Button
To SILENCE alarm
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.
Problem: The dryer failed to pull a vacuum after three
attempts.
Dryer attempted to pull a vacuum 200mm below atmosphere within 45
seconds (default). Dryer attempted three times (number of default retries).
After each attempt vacuum was equalized and vacuum gates were opened
and closed in an attempt to reseal the Vacuum Chamber (possible debris
or pellets preventing adequate seal). Defaults are controlled the NVT
parameter (retries and seconds). This alarm is non-fatal. Dryer will
continue to reseal after alarming.
Solution: If Dryer continues to alarm, check: compressed air connection
and pressure (dryer's regulator should be reading 85psi). Check for debris
in seals above and below Vacuum Chamber.
Retention Hopper Not Present
If retention hopper loadcell is reading 6.6 pounds (3000 grams) below tare
during AUTO run, this alarm is triggered and Dryer stops (fatal). This alarm
is generally caused by a missing Retention Hopper but may also be caused
by dryer Retention Hopper load cells having been zero calibrated while
material was in the Retention Hopper, or faulty loadcells.
Solution: If Retention Hopper is missing replace Retention Hopper. If
Retention Hopper is in place, ensure the tank is empty and zero calibrate
the load cells. If load cells are damaged, a zero calibration may detect
this.
Problem: RTD (temperature sensor) reading is above or
below max/min reading
RTD Sensor is probably disconnected or damaged. Check temperature
display reading in a cool state. Temperature should display room
temperature. If reading is below -25C or above 450C RTD sensor has
failed.
Solution: Contact Maguire Technical Support for a replacement RTD
Sensor.
Rev. August 31, 2016 – VBD-150
Maguire Products, Inc.
65