FRITSCH PULVERISETTE 7 classic line - Manual (Page 45)

9 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.
9.1 Checklist for troubleshooting
Fault description Cause Remedy
The POWER SUPPLY ready status indi-
cator does not light up
No mains connection Plug in mains plug
Main switch Switch on main switch.
Device fuse Check device fuse.
START button is pressed but mill does
not start up
Check above if POWER SUPPLY is
not lit up
See above
if LID LOCK ACTIVATED is not lit up Close the hood firmly
Pause time active Wait for end of pause or press STOP
Fuse blown Set the fuse to 0.063 A T on the board
or 10 A T in the frequency converter
Mill reduces speed If OVERLOAD lights up: Overload Press STOP; reduce load or accept the
reduced speed
Mill stops running Switched off due to thermal over-
load of the drive
Allow device to cool down and select a
lower speed
Imbalance of machine too high Correct the mass balancing
Drive was blocked Rectify malfunction in grinding
chamber
Motor's V-belt loose or ripped Check V-belt, replace if necessary
Speed sensor is defective Call customer service.
The hood cannot be opened The button on the front of the
hood was not activated when
opening
Open the hood by using the hood
handle
Repairs
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