NT PROPORTIONAL CONTROL VALVE, MODEL 6300
16
User Guide | Entegris, Inc.
Diagnostic Guide
SYMPTOM
POSSIBLE CAUSES
SUGGESTIONS
1. Unit is
unresponsive
No power
Check power connections or fusing.
No setpoint signal
Check setpoint wiring for correct setup.
Verify setpoint code of the proportional
control valve matches your wiring setup
and applied setpoint.
Rezero line active
Clear rezero line.
2. Unit is unable
to meter flow
Unit is undersized
Use a larger C
V
unit.
Unit is oversized
Use a smaller C
V
unit.
Unstable setpoint signal
Check wiring and setpoint electrical
stability.
3. Unit operation
is unstable
Unit installed backwards
Verify inlet/outlet connection.
Unstable pressure
Check applied pressure stability and/or
stability of downstream backpressure.
Unstable setpoint signal
Check wiring and setpoint
electrical stability.
4. Unit causes
high pressure
when closing
External valving
Verify the unit does not close against a
fixed volume, trapped between valves
(the proportional control valve can be
one of the two valves).
Stepper motor valve closes and creates
entrapped fluid.
5. Unit does
not close
External valving —
entrapping a fixed volume
Close unit before closing external valve.
See page 14 for more information.
Foreign object in valve
Clear obstruction with back flush/
forward flush procedure.
6. Unit leaks
fluid out of
weep hole
Overpressure on unit
Intermittent — single overpressure
event. Monitor for future instances.
Continuous — diaphragm rupture.
Call factory for more information.