Error Code Messages - Watlow 945 Series User Manual

Error Codes
NOTE:
An alarm display will
be masked by an
error condition or
when the control is
in the Calibration or
Setup Menus.
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WARNING:
Electrical noise or a
noise event, vibra-
tion or excess
environmental
moisture or tem-
perature may cause
Series 945 errors to
occur. If the cause
of an error is not
otherwise apparent,
check for these.
26
WATLOW Series 945 User's Manual

Error Code Messages

Four dashes, "- - - -", in the upper display indicate a Series 945 error. The
error code is visible in the lower display.
Er 1 - Sensor overrange error
The sensor input generated a value higher than that allowed for the range of the
sensor, or the A/D circuitry malfunctioned. Enter a valid input. The A/D value is
above the range limits, but within the A/D conversion limits. Make sure the In
parameter matches your sensor.
Er 2 - Sensor underrange error
The sensor input generated a value lower than that allowed for the range of the
sensor, or the A/D circuitry malfunctioned. Enter a valid input. The A/D value is
below the range limits, but within the A/D conversion limits. Make sure the In
parameter matches your sensor.
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 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 6 - A/D underflow error
The A/D circuit is underrange. An open or reversed polarity sensor is the most
likely cause. Check the sensor; if the connection is good, and functions properly,
call the factory. The A/D underrange voltage is too low to convert an A/D signal.
Make sure the In parameter matches your sensor.
Er 7 - A/D overflow error
The A/D circuit is overrange. An open or reversed polarity sensor is the most likely
cause. Check the sensor; if the connection is good, and functions properly, call the
factory. The A/D overrange voltage is too high to convert an A/D signal. Make sure
the In parameter matches your sensor.
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Tuning and Operating, Chapter 5