Watlow Series 988LF - Manual (Page 52)

7.6 WATLOW Series 988LF Users Manual Tuning, Manual Operation, Alarms, and Error Codes, Chapter 7
Error Codes
NOTE:
An alarm display will be
masked by an error
condition or when the
control is in the Calibra-
tion or Setup menus.
The ambient temperature of the Series 988LF has dropped below 32°F/0°C
or risen above 149°F/65°C. Calibration errors can also cause this error
code. Try setting [`rSt] (Calibration Menu) to [`yES].
[`Er4]: RAM verification error
An internal RAM failure has occurred. Contact the factory.
[`Er5]: Non-volatile checksum error
An EEPROM checksum error was detected. Turn the power off then back
on again. If this does not clear the error, contact the factory.
[OPLP]: Open-loop detect
This error is not available while in the on/off mode. It is only active when
[OPLP] is set to [``On] (Diagnostics Menu).
[`Er9]]]]]: Configuration error
An incorrect module has been installed in the control. Contact the factory.
Error Code Actions
• All of the above error codes except [`Er4], [`Er5] and [`Er9] will
result in this condition:
• 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 occurred, 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).
• To clear an error code…
• If [`Err] is set to [`nLA], the error code should clear once the
problem is corrected.
• If [`Err] is set to [`LAt], correct the problem and cycle power. You
can also clear the error by pressing both the Up-arrow > and
Down-arrow < keys to enter the Setup Menu, then press the
Display key ¥.
• Error codes [`Er4], [`Er5] and [`Er9] will result in these conditions:
• The control is in automatic operation with both control outputs off.
• The alarm outputs are in their alarm state (de-energized with the
LED lit).
• The lower display is blank.
• The upper display indicates the error code.
• All keys are inactive.
• With [`Er5], all Setup Menu prompts return to default values.
Cycle power to the control. If the error is still present contact the factory.