Retsch DM 400 - Manual (Page 52)

Repair
52
8.1 Checklist for troubleshooting
Malfunction Possible cause Rectification of fault
Mill does not start No mains connection Plug in
Mains switch is off Switch the mains switch on
Grinding chamber safety switch open Correctly connect the grinding chamber
Sample material container safety switch
open Correctly insert the sample material container
Thermal circuit breaker has triggered Wait until the device has cooled down
Fuse in the control circuit has triggered Have the fuse replaced by qualified specialists.
Discs do not rotate Gap width set to 0 Adjust the gap width! See chapter “Working with
the disc mill ”
Sample is blocking the disc Open grinding chamber and remove the sample
Mill stands still during operation Overload! Switch off by motor circuit
breaker switch (main switch) Allow the mill to cool. Remove sample material,
reduce feed of sample material
Grinding chamber overfilled. Too large /
hard sample material has become stuck Open the grinding chamber and empty
Mill produces poor grinding
result Grinding discs are worn Change the direction of rotation or replace grind-
ing discs. See chapter
“Reverse operation” or
chapter “Replacing the grinding discs (5 + 6)“
Grinding discs are not installed in parallel Remove grinding discs, clean the support and
reinsert (see
chapter “Working with the disc mill” )
Sample materials escapes Grinding chamber seals and sample
material container seals dirty or faulty Clean or replace seals
Collecting container overfilled (max. 2l) Remove container and clean the inside
Error message sample material
container Sample material container not recognised Slide container in centrally
Soiling of the container guide Cleaning
No release of the sample
material container after STOP Release mechanism on sample material
container faulty Release by emergency actuation inside the
device; see
chapter “Protection against restart-
ing ”. Contact Retsch!
Automatic gap adjustment not
possible Control panel is faulty Replace the control panel
Gap adjustment is faulty Contact Retsch
Temporary problem solution using the set screw
(7) on the bottom right-hand side at the front!
Adjust the precise gap width manually!
Discs have got stuck With the help of the set screw (7), loosen! Rea-
lign the zero point!
Error message Gap width, grinding chamber, sample
material container Actuate the STOP button