Troubleshooting - KNF SC 920G Manual De Instrucciones

Troubleshooting

Vacuum pump system as a whole
Problem
Vacuum pump system is
switched on, but the mains
switch does not light up.
Required vacuum not
generated even though pump
is running.
36 Translation of original Operating Instructions, English, KNF 334631-334633 07/21
10. Troubleshooting
Extreme danger from electrical shock!
 Disconnect the pump power supply before working
on the pump.
DANGER
 Make sure the pump is de-energized and secure.
Vacuum pump system as a whole: see table 7.

Hand terminal: see table 8.

Software operation: see table 9.

Cause
Mains cable not plugged in.  Plug the mains cable for the vacuum
No current in electricity
network.
Vacuum pump system
fuses blown.
Leaks in vacuum chamber. 1.
O-ring is not sitting
correctly in the slot on the
suction side of the
collection flask.
Leaks in hose connection.
Hexagonal gland (Fig. 2/8,
p. 12) loose.
Vacuum Pump System SC 920G
Solution
pump system into a properly
grounded power socket.
 Check the electricity supply.
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. 3/4, p. 12) and
pull the drawer out.
Replace the defective fuse(s)

(for fuse specifications see chapter
4.1, page 8; for fuse order numbers
see chapter 11, p. 40).
Push the fuse drawer back in until it

clicks into position.
Run a test by closing the gas inlet
(Fig. 2/7,p. 11). If the pump reaches
the required vacuum, this confirms
the presence of leaks in the vacuum
chamber.
2. Eliminate leaks in the vacuum
chamber.
 Adjust O-ring.
 Replace if defective (for order
number for O-ring, see chapter 11,
p. 40).
 Check hoses are sitting correctly on
hose nipples.
 Replace any leaky hoses.
 Replace any damaged hose nipples.
 For ordering numbers see chapter
11, page 40.
 Carefully tighten hexagonal gland
with wrench.