Extech Instruments 96VFL User Manual

VFL Series User Manual v2.0 10/20
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15. Appendix A: Troubleshooting
Errors
Probable Cause
Action
Sensor break or sensor not
connected.
Connect or replace
sensor.
A/D converter failure.
Service required.
Check for EMI or
RFI interference.
Auto Tune time-out error.
Manually tune
control.
Keypad not functioning
Keypad locked.
Keypad defective.
Check the ‘LOCK’
parameter.
Service unit.
Process value unstable
Improper PID tuning.
Tune the
controller.
No heat or output
Fuse blown.
Incorrect wiring.
Heater defective.
Check wiring and
fuse.
Check heater.
LEDs and display not lighting up
No power to controller.
Controller failure.
Check power
connection.
Service meter.
Process Value changed abnormally
Electromagnetic (EMI) or
Radio Frequency (RFI)
interference.
Protect the controller
with arc suppressing
external circuitry. This
will eliminate high
voltage spikes.
Separate the sensor
and power wiring.
Ground heaters
Entered data lost
EEPROM error.
EMI or RFI
interference.
Service required.

Extech Instruments 96VFL Specifications

General

Brand	Extech Instruments
Model	96VFL
Category	Controller
Language	English