FRITSCH PULVERISETTE 13 classic line - Manual (Page 38)

10 Repairs
DANGER!
Mains voltage!
– Before beginning with repair work, unplug the mains
plug and protect the device against being unintention-
ally switched back on.
– Indicate repair work with warning signs.
– Repair work may only be performed by specialised per-
sonnel.
– Put safety equipment back into operation after mainte-
nance work.
10.1 Checklist for troubleshooting
Fault description Cause Remedy
Mill does not start up No mains connection Plug in mains plug
Grinding chamber safety switch is
open
Close the grinding chamber properly
Grinding stock container safety
switch open
Insert the grinding stock container properly
Overload of the motor Allow motor protection switch to cool down
Grinding disks are not
rotating
Grinding disks are touching (gap
width < 0.1 mm)
Set gap width or stop screw, see Ä Chapter 6.1
‘Setting the minimum gap width’ on page 22
Mill stops running during
operation
Overload! Switching off by motor
protection switch
Allow the mill to cool down, reduce sample
addition
Grinding chamber overfilled, jam-
ming of grinding stock that is too
large/hard
Open grinding chamber and empty
Mill has poor grinding
result
Grinding disks worn down Reverse direction of rotation or replace grinding
disk. See Ä Chapter 9.3 ‘Exchanging the
grinding disks’ on page 34 and Ä Chapter 9.2
‘Rotation direction of the drive motor’
on page 34.
Grinding disks not parallel Remove grinding disks, clean holder and rein-
sert
Grinding stock escapes Grinding chamber or grinding stock
container seals is soiled or defective
Clean or replace seals
Repairs
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