38
Watlow Series 935B User’s Manual
Errors and Troubleshooting
Key Error Information
Set up an input failure operation mode at the
[FAIL]
prompt in the
[CnFG]
menu; choose bumpless
transfer
[bPLS]
for smooth output action transition to percent power control, or select a percent power
output value.
[FAIL}
[bPLS]
Bumpless Transfer
when errors occur, the control output will continue at a percent output learned while stable. Default =
[bPLS]
.
[-100] [`100]
Percent Power
(-100% to +100% , depending on heat/cool output configuration). The control will assume a specific output
power when input errors occur.
• All except one of the possible displayed error messages are input related.
• If you see
[`Er5]
, cycle power to the controller. If the error persists, call the factory.
• Be aware of the difference between U.S and European thermocouple color/colour codes.
• Reversed polarity input leads is one of the most common errors.
• Incorrect software input choice at the Configuration Menu
[CnFG]
input
[``In]
prompt is another
common error.
When calling the factory for help, please have:
1.
The model number of the control.
2.
A photocopy of pages 51-58 with the settings from your control, if possible.
3.
Specifications of devices directly interfaced with the control.
Configuration Menu
[``In]
Input Type
[`C_F]
Celsius/Fahrenheit
[``rL]
Input Range Low
[``rh]
Input Range High
[`Ot1]
Output 1 Function
[`Ot2]
Output 2 Function
[dISP]
Display Default
[ALtY]
Alarm Type
[AhYS}
Alarm Hysteresis
[`LAt]
Alarm Latch
[`SIL]
Alarm Silencing
[FAIL}
✓
Failure Mode
[tIM]
Timer Function
[Strt]
Start Timer
[`rdY]
Timer Ready Band
[``St]
Signal Time
[SLOC]
Set Point Lockout
[`tAG]
Lockout Tag
