Retsch SM 200 - Manual (Page 37)

Fault messages
37
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9 Fault messages
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Flashing sequence Meaning Instruction
G4 and G5 flash
alternately
Safety circuit is not
closed

Close the door.

Pull the locking bracket forwards.

Allow the locking bolt to engage.
G5 flashes Motor block

Remove the blocking pieces of sample material
from the grinding chamber.

Press button G6

Press button G1.
G4 + G5 flash
simultaneously
Faulty relay contact

Service necessary!
G4 flashes Revolving field
detection 
Switch the two phases (L1 with L2) on the power
cable
Fig. 30:Flashing sequence during error message
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G1
G4
G5
G6
G4