Cole Parmer 05017-10, Руководство пользователя

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A group of six messages alert the operator to heater and control
malfunctions. The OTC (open thermocouple) and OVR (over temp)
errors alternately display in the TEMP/VACUUM display. The PWRF
(power failure), BATT LOW (low battery) and CRC (calibration data
corruption) are displayed in the DAY/TIME display window. All messages
and their meanings are as follows:
OTC (Open Thermocouple): The TEMP/VACUUM display alternates
between OTC and current chamber pressure at 5 second intervals, where
OTC replaces the normal process temperature display field. The heaters
and vacuum pump (if connected to auxiliary contacts) are forced OFF.
Program execution is halted.
OVR (Over Temperature): Activates if oven temperature exceeds
the se20°C.
PWRF (Power Failure): Power failure only detected during program mode.
The failure must be longer than 2 minutes. Time display alternates
between PWRF, HH:MM and DAY(n) at 5 second intervals.
BATT LOW (Low Battery): Indicates it is time to replace the 6-year
battery module. Module is in a socket on the back of the control board.
See control board illustration on previous page.
CRC (Calibration Data Corrupted): Indicates an error in the stored
calibration data. The heater and pump relay are forced off. Unit must be
calibrated to clear.
Run Away Heater Safety:
In the event the heater triac or control
malfunctions and results in a run-away heater, a secondary thermostat is
in place that will automatically pick up control of the heaters at
approximately 325°C. If the set point is above 270°C and the display is
indicating a chamber temperature of 325°C (±12°C), this will be an
indication the secondary thermostat has taken over control of the oven.
If the set point is at 270°C or below, the temperature display will show
OVR at every other temperature display update. In either case, Technical
Services should be contacted to check the heater circuit.
4-4 Vacuum Oven Cole-Parmer
Section 4
Controls, Indicators and Connectors
Self-Diagnostic
Safety Monitors