Despatch RFD Series - Manual (Page 37)

RFD Oven Series Owner’s Manual T ROUBLESHOOTING
Version 1 37
Copyright © 2012 by Despatch Industries.
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7.
Troubleshooting
7.1. Troubleshooting: Possible Problems and Solutions
Equipment which operates for long periods of time may develop problems. Table 3 lists possible
problems and suggested solutions. If you have a problem not listed and do not know what to do,
contact Despatch Industries at our toll free Help Line 800-473-7373.
Table 3. Troubleshooting grid.
Difficulty
Probable Cause Suggested Remedy
Failure to heat or
heats up to only 35-
50ºC
No power Check power source and/or oven and wall
fuses
Burned out heater Replace heater (see warranty, Section 8.1)
Protocol 3 controller
malfunction Replace controller
Loose wire connections Disconnect power and check connections be-
hind control panel
Heater relay failure Replace heater contactor or SCR
Door switch failure (if
installed) Replace door switch
Slow heat up
Improperly loaded Reduce load or redistribute load in chamber.
Low line voltage Supply sufficient power and proper
connections. Check for circuit overload
Heating element(s) are
burned out Replace heater (see warranty, Section 8.1)
Fan motor failure Replace fan motor
Frequent heater
element burnout
Harmful fumes generated
by load Increase vent opening or discontinue process
Spillage or splattering of
material on heater
elements Disconnect power and clean oven chamber.
Take measures to prevent splattering.
Overheating oven Check the High Limit
Erratic temperature
or
inaccurate
temperature
Protocol 3 controller
malfunction Replace controller
Improper tuning
parameters Check tuning parameters
Protocol 3 controller
miscalibration Recalibrate controller (see Protocol 3
Controller Owner’s Manual for further
instruction manual).
High Limit setting High Limit should be 10-25ºC higher than
setpoint.
Defective SCR Replace SCR
Improper offset Check zone calibration
Excess surface or
door temperature
Door seal deterioration Replace door seal.
Improper airflow
Fan motor failure Replace fan motor
Fan wheel seated too low Adjust fan wheel for 3/16" clearance between