Despatch LCC Series - Figure 29. Protocol 3 Heater on Indicator Light; Table 12. Error Messages, Possible Causes, and Remedial Steps; Table 13. Relay Assignments

LCC_LCD1-16/51 Oven Owner’s Manual C244, 320207, REV B
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Figure 29. Protocol 3 Heater ON Indicator Light.
Check high limit safety status light, , on the right button/indicator light
column. High limit light should not be ON. If light is on, reset high limit and test
oven again.
Table 12 lists common error messages, possible problems and remedies. Refer to
Protocol 3 manual for further troubleshooting hints.
Table 12. Error Messages, Possible Causes, and Remedial Steps.
Alarm Status
Possible Problem
Next Step
HI LIMIT LED ON
• Problem with thermocouple
• High Limit setpoint has
been exceeded.
Once the problem has
corrected, press RESET.
DEV HOLD LED flashing
Oven temperature has not
entered (or dropped out of) the
Auto Hold band and the soak
timer has stopped
Program a slower ramp rate or
if oven is not heating check
heater circuit.
Top PV displays OPEN
Control thermocouple is
disconnected or broken
Repair or replace the
thermocouple.
HLPV displays OPEN
High Limit thermocouple is
disconnected or broken
Repair or replace the
thermocouple.
Functions assigned to the five Protocol 3
TM
relays are listed on Table 13.
Table 13. Relay Assignments
Relay Number
Circuit
Position #1
Water Cooling
Position #2
Unused
Position #3
N2 Purge option
Position #4
N2 Maintain option
Position #5
End of Cycle Alarm