Watlow Electric Micro-Based Autotuning Control SERIES 980/985 - Manual (Page 32)

Press
~ twice-
Read
error
Figure 32 -
Error Code Display
Examples
NOTE:
Electrical noise or a
noise event, vibra-
tion or excess
environmental
moisture or tem-
perature may cause
Series 985 errors to
occur. If the cause
of an error is not
otherwise apparent,
check for these.
•If the alarm is non-latching...
The alarm will clear automatically as soon as the process
temperature is inside the alarm limit by 3°F/l.7°C for 1° RTD units, or
0.3°F/0. 17°C for 0.1° RTD units.
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CAUTION:
An alarm display will be masked by an error condition or when the
control is in the Calibration or Set Up Menus.
How To Deal With Error Codes
Three dashes, “- - -", in the upper display indicate a Series 985 error.
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If operator access is LOC 0 or 1 . . .
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Press the AUTO/MAN key twice to see the error code for one
second.
•
If operator access is LOC 2 or 3...
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The error code is already in the lower display.
• Error code definitions and actions...
Er 1 - Sensor overrange error
The sensor input is generating a value that is higher than that allowed for
the range of this sensor, or the A/D circuitry is not functioning properly.
Enter a valid input.
Er 2 - Sensor underrange error
The sensor input is generating a value that is lower than that allowed for
the range of this sensor, or the A/D circuitry is not functioning properly.
Enter a valid input.
Er 3 - Ambient error
Check the specification for the ambient temperature range.
Er 4 - Configuration error
The unit’s microprocessor is faulty; call the factory.
Er 5 - Non volatile checksum error
The nonvolatile memory checksum has discovered a checksum error.
Unless a momentary power interruption occurred while the unit was
storing data, the nonvolatile memory is bad. Call the factory.
Er 7 - A/D overflow error
The A/D circuit is over- or under-range. An open or reversed polarity
sensor is the most likely cause. Check the sensor; if it is connected and
functioning properly, then call the factory.
To clear a corrected error...
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Cycle power to the control.
32
WATLOW Series 980/985 User’s Manual Tuning and Operating, Chapter 5