Watlow Series 988LF - Manual (Page 51)

Tuning, Manual Operation, Alarms, and Error Codes, Chapter 7 WATLOW Series 988LF Users Manual 7.5
Error Codes
NOTE:
To view the error code,
press the Auto/Man key
å once. The upper
display shows the error
code for five seconds
before returning to the
[----] [----] [----] [----] [----] display.
Figure 7.5 -
Error Code Display
NOTE:
An alarm display will be
masked by an error
condition or when the
control is in the Calibra-
tion or Setup menus.
Error Code E1 and E2 Messages
Four dashes, [----], in the upper display indicate a Series 988LF error. If
the control was operating with stable output values (less than 75% power
and less than a 5% changeover the past 2 minutes) when the error oc-
curred, it continues to operate at those levels on a percent-power basis
([bplS]). If output values were not stable, or the percent output was
greater than 75%, the control outputs drop to 0% power (off).
[E1`1] [E2`1]: A/D underflow error
The analog-to-digital (A/D) converter of the input indicated by the first
number is under range. An open or reversed polarity sensor is the most
likely cause. Check the sensor. Make sure the input prompt is set to the
correct sensor.
TL W WA
PROCESS
L1 L2 L3 L4
DEV
% OUT
DISPLAY
SERIES 988
MODE
AUTO
MAN
[E1`2] [E2`2]: Sensor under-range error
The sensor at the input indicated by the first number generated a value
lower than that allowed for the range of the sensor, or the analog-to-digital
(A/D) converter malfunctioned. Make sure the setting for the input (Setup
Menu) matches the sensor type and that the sensor range falls within the
range of the process being controlled.
[E1`3] [E2`3]: Sensor over-range error
The sensor at the input indicated by the first number generated a value
higher than that allowed for the range of the sensor, or the analog-to-digital
(A/D) converter malfunctioned. Make sure the setting for the input (Setup
Menu) matches the sensor type and that the sensor range falls within the
range of the process being controlled.
[E1`4] [E2`4]: A/D overflow error
The analog-to-digital (A/D) converter at the input indicated by the first
number is over range. An open or reversed polarity sensor is the most
likely cause. Check the sensor. Make sure the input (Setup Menu) is set
to the correct sensor type.
The analog-to-digital (A/D) converter input voltage may be too high to
convert an A/D signal.
[`Er3]: Ambient temperature error