Tuning and Operating, Chapter 5
26
WATLOW Series 945 User's Manual
NOTE:
An alarm display will
be masked by an
error condition or
when the control is
in the Calibration or
Setup Menus.
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.
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.
Error Codes
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