KNF SC 950, Operating Instructions Manual

Page: 54 / 64

Troubleshooting Vacuum Pump System SC/SEM/SH/SR950
54 Translation of original Operating Instructions, English, KNF 125549-125552 07/18
10. Troubleshooting
DANGER
Extreme danger from electrical shock!

Disconnect the pump power supply before working
on the pump.

Make sure the pump is de-energized and secure.

Vacuum pump system as a whole: see table 9.

Only SC 950:
Hand terminal: see table 10.

Only SC 950:
Software operation: see table 11.
Vacuum pump system as a whole
Problem Cause Solution
Vacuum pump system is
switched on, but the mains
switch does not light up. Mains cable not plugged in.

Plug the mains cable for the vacuum
pump system into a properly
grounded power socket.
No current in electricity
network.

Check the electricity supply.
Vacuum pump system
fuses blown. 1. Find and eliminate the cause of the
overload.
2. Replace the mains fuse(s) of the
vacuum pump system:

Push the locking clip on the fuse
drawer down (Fig. 2/
17 , p. 13 or
Fig. 4/ 14 , p. 17, Fig. 5/ 13 , p. 19 and
Fig. 6/ 12 , p. 21) and pull the drawer
out.

Replace the defective fuse(s)
(for fuse specifications see chapter
4.1, page 9f; for fuse order numbers
see chapter 11, p. 59).

Push the fuse drawer back in until it
clicks into position.
Required vacuum not
generated even though pump
is running.
Leaks in vacuum chamber. 1. Run a test by closing the gas inlet
(Fig. 2/ 19 , p. 13 or Fig. 4/ 16 , p. 17,
Fig. 5/ 14 , p. 19 and Fig. 6/ 13 , p. 21).
If the pump reaches the required
vacuum, this confirms the presence
of leaks in the vacuum chamber.
2. Eliminate leaks in the vacuum
chamber.
O-ring is not sitting
correctly in the slot on the
suction side of the
collection flask.

Adjust O-ring.

Replace if defective (for order
number for O-ring, see chapter 11,
p. 59).