MDB Series Dryers
Reference Manual (PN: 882.02900.00) for
Complete Operation and Installation Instructions
(Available online at www.sterlco.com)
Sterling Products, Inc.
Part No:
882.99179.02
2900 S. 160
th
Street
•
New Berlin, WI 53151 USA
Bulletin No: DH1-320.00
Tel. 262-641-8610 • Fax 262-641-8653
press
START/STOP
to start the system.
TROUBLE SHOOTING
NOTE: For additional troubleshooting tips see the Troubleshooting section in the Operation and Installation Manual.
PROBLEM
POSSIBLE CAUSE
CORRECTIVE ACTION
LOSS OR REDUCTION OF PROCESS AIR
TEMPERATURE.
PROCESS HEATERS ARE FAULTY.
CHECK FOR OPEN HEATERS. REPLACE IF
REQUIRED.
SOLID-‐STATE RELAY IS FAULTY.
REPLACE SOLID-‐STATE RELAY.
PROCESS TEMPERATURE WAS IMPROPERLY
ADJUSTED.
REVIEW PRODUCT FOR PROPER SETTING. TRAIN
PLANT PERSONNEL ABOUT PROPER
TEMPERATURE SETPOINT AND OPERATION.
LOSS OR REDUCTION IN DRYING CAPACITY.
PROCESS HEATERS ARE FAULTY.
REPLACE.
DESICCANT BEDS ARE CONTAMINATED.
REPLACE DESICCANT.
MATERIAL BEING DRIED DIFFERS FROM MATERIAL
SPECIFIED AT THE TIME OF PURCHASE.
DRYING SYSTEMS ARE DESIGNED FOR THE
MATERIAL WHICH WAS ORIGINALLY SPECIFIED.
DIFFERENT MATERIALS MAY NEED A LONGER
RESIDENCE TIME OR DIFFERENT DRYING
TEMPERATURE.
BREAK IN FLEX HOSE TO/FROM DRYING HOPPER.
INSPECT FOR AIR LEAKS, REPLACE IF NECESSARY.
AIRFLOW VALVE STICKING OR FAILING TO SHIFT.
CHECK FOR PROPER OPERATION OF VALVE
ACTUATORS.REPAIR OR REPLACE IF NECESSARY.
BLOWER FINS FILLED WITH DUST OR
CONTAMINANTS.
REMOVE BLOWER SIDE PLATE, CLEAN BAFFLES,
REPLACE. REPLACE FILTER ELEMENTS.
MATERIAL IN DRYING HOPPER CAKES OR
MELTDOWN OCCURS.
PROCESS TEMPERATURE SET TOO HIGH DUE TO
OPERATOR ERROR.
CHECK RESIN MANUFACTURER’S DATA SHEET
FOR PROPER DRYING TEMPERATURE. MAKE
SURE PLANT PERSONNEL ARE AWARE OF THE
CORRECT PROCESS TEMPERATURE SET POINT.
HIGH TEMPERATURE ALARM NOT SET PROPERLY.
RESET HIGH TEMPERATURE ALARM.
PROCESS SET POINT IS OUT OF ACCEPTABLE
RANGE.
RESTORE TEMPERATURE CONTROLLER TO
FACTORY PRE-‐SETS.
FUNCTION SET FOR DEGREES CELSIUS (
0
C), SET
POINT AT DEGREES FAHRENHEIT (
0
F).
VERIFY CORRECT CELSIUS OR FAHRENHEIT
SETTINGS.
POOR DEW POINT PERFORMANCE.
BURNED OUT REGEN HEATER.
REPAIR OR REPLACE.
CONTAMINATED OR WORN OUT DESICCANT.
REPLACE.
LEAKING PROCESS AIR HOSES.
REPAIR OR REPLACE.
DRYER OPERATES BEYOND ITS CAPACITY.
CHECK DRYER AND DRYING HOPPER SIZING.
BAD DEW POINT SENSOR.
REPLACE.
FOULED DEW POINT SENSOR MANIFOLD.
CLEAR OBSTRUCTION. AIR SHOULD FLOW
FREELY THROUGH SENSOR.
PROCESS VALUE IS ABNORMAL OR NOT
OBTAINED.
INPUT POLARITY ON THERMOCOUPLE IS WRONG
OR CONNECTION IS WRONG.
PROPERLY WIRE THE TERMINALS.
NO COMPENSATING LEAD WIRES USED FOR
EXTENSION OF THE THERMOCOUPLE.
USE PROPER COMPENSATING LEAD WIRES AND
TERMINALS.
THERMOCOUPLE AND CONTROLLER ARE
CONNECTED BY WIRES OTHER THAN PROPER LEAD
WIRES.
USE A DEDICATED THERMOCOUPLE
CONNECTOR. IF A CONNECTOR IS A METAL
DIFFERENT FROM THE THERMOCOUPLE AND
CONTROLLER, AN ERROR MAY RESULT.
SENSOR IS BROKEN OR SHORT-‐CIRCUITED
REPLACE.
THE CONTROLLER IS INFLUENCED BY NOISE OR
OTHER INDUCTION.
SEPARATE INPUT WIRES AS FAR AS POSSIBLE
FROM THE ORIGIN OF THE NOISE.
CELSIUS TEMPERATURES USED INSTEAD OF
FAHRENHEIT OR VICE VERSA.
SETUP MODE LEVEL 2 DISPLAY d-‐U. S-‐V SHOWS
SETTING.
GROUNDED THERMOCOUPLE
USE AN UN-‐GROUNDED THERMOCOUPLE
