Troubleshooting
Vacuum Pump System SC 920G
42
Translation of original Operating Instructions, English, KNF 121308-121311 07/18
Vacuum pump system as a whole
Problem
Cause
Solution
Overcurrent protection of
vacuum pump system has
been activated.
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.
36) and make sure that adequate
supply and removal of cool air is
provided.
Find and eliminate any other cause
of pump overload.
Noisy pump.
Leaking hose connection.
Check that hoses are sitting correctly
on hose nipples.
Replace any leaking hoses.
Replace any damaged hose nipples.
Leaks at hose nipple on
high-performance
condenser.
Tighten hose nipple at gas outlet
17
, p. 12).
Leaks in overpressure
valve on high-performance
condenser.
Check overpressure valve is sitting
correctly; replace if necessary. For
ordering number see chapter 11,
page 45.
Tab. 7
Hand terminal
Problem
Cause
Solution
Hand terminal cannot be
removed from vacuum pump
system.
Transport fastener has not
been removed.
Remove transport fastener (see
chapter 6, p. 17).
Hand terminal display fails to
light up.
Hand terminal not switched
on.
Switch hand terminal on.
Batteries of hand terminal
have run down.
Charge batteries by placing the
terminal in the holder provided on
the vacuum pump system, with the
system switched on.
Alternatively, operate the terminal
via the power supply.
The hand terminal display
keeps showing "No connec-
tion"; if a button of the touch-
screen is actuated a signal
tone sounds.
Vacuum pump system is
switched off.
Switch the vacuum pump system on
at the mains switch. The mains
switch should light up.
The hand terminal is
designed for use with a
different SC 920G vacuum
pump system.
Use the page function (see Actuating
the vaccum pump system, p. 29) to
check whether the right hand termi-
nal is being used.
