KNF SC 920G Manual De Instrucciones página 82

Troubleshooting
Vacuum pump system as a whole
Problem
Pump not activated on
process start-up, in spite of
pressure decrease command.
Noisy pump.
Hand terminal
Problem
Hand terminal display fails to
light up.
Pressure display shows
implausible values.
38 Translation of original Operating Instructions, English, KNF 334631-334633 07/21
Cause
Overcurrent protection of
vacuum pump system has
been activated.
Leaking hose connection.
Leaks at hose nipple on
high-performance
condenser.
Leaks in overpressure
valve on high-performance
condenser.
Tab. 6
Cause
Hand terminal not switched
on.
Unit of pressure for display
has been changed.
Leaks in system.
Recalibration of pressure
sensor required.
Tab. 7
Vacuum Pump System SC 920G
Solution
 Reset by switching the vacuum
pump system off and back on.
 Check that there is no object
blocking the pump fan (Fig. 17/20, p.
33) and make sure that adequate
supply and removal of cool air is
provided.
 Find and eliminate any other cause
of pump overload.
 Check that hoses are sitting correctly
on hose nipples.
 Replace any leaking hoses.
 Replace any damaged hose nipples.
 Tighten hose nipple at gas outlet
(Fig. 2/17, p. 12).
 Check overpressure valve is sitting
correctly; replace if necessary. For
ordering number see chapter 11,
page 40.
Solution
 Switch hand terminal on.
 Set desired unit of pressure.
 See Tab. 8, "Required vacuum not
generated even though pump is
running".
 Contact KNF Service.