Specifications

Appendix l AA-33
Passive Alarms (continued)
Problem
Drying Monitor Low
Temperature Alarm
(DM Low Temp) - Once the
temperature at the RTD select-
ed in Screen B has reached the
Low Temperature Alarm
Setpoint in Screen C, the
alarm will become active if
the temperature drops below
the Low Temperature Setpoint
for a length of time longer
than the delay time in Screen
F.
Possible cause
Material throughput too high.
Material level in the hopper is below the
selected Low Temperature Alarm RTD.
Process air is not at the proper drying
temperature.
On central dryers with HTC, the process
setpoint of the HTC control and drying
setpoint of DM-II may not be the same.
Poor airflow to the hopper.
Solution
Ensure the material usage is within the
rated capacity of the dryer and hopper in
use.
Check your material supply system for
loader problems, material availability,
etc.
On central dryers with HTC, ensure the
HTC control has been turned on. Check
for process deviation or loop break
alarms on the dryer or HTC control.
Take whatever steps are necessary to
achieve the correct drying temperature.
Determine which setpoint is incorrect
and adjust as needed.
Clean or replace process filter, dust col-
lector, etc. in the process airstream.
Verify the blower is operating properly,
including correct rotation.
Straighten crimps or remove any objects
that may restrict airflow through hoses
and tubes.
Connect any loose hoses. Replace any
damaged hoses.