Tuning and Operating, Chapter 6
44
WATLOW Series 942 User's Manual
Error Code Messages
Four dashes, "- - - -", in the upper display indicate a Series 942 error.
• The error code is visible in the lower display.
•
Error code definitions and actions…
Er 1
- Sensor overrange error
The sensor input generated a value that was 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 that was 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 the
sensor 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 the
sensor functions properly, call the factory. The A/D underrange voltage is
too high to convert an A/D signal. Make sure the
In
parameter matches your
sensor.
Error Codes
Figure 41 -
Error Code Display
Example
WARNING:
Electrical noise or a
noise event, vibra-
tion or excess
environmental
moisture or tem-
perature may cause
Series 942 errors to
occur. If the cause
of an error is not
otherwise apparent,
check for these.
!
!
