Hettich ROTINA 420, Repair Instructions

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IMBALANCE
Imbalance on motor axle.
The rotor slows down braked until it stops.
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Reset error code:
Open the lid or perform a MAINS RESET.
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Weight difference in rotor components.
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The supporting lugs of the rotor are not lubricated.
•
Check grounding of the motor.
A missing grounding of the motor causes disturbing signals
which can produce the error.
•
Check the maximum permissible imbalance values, see pg. 59,
chapter 6.15.3.
•
Imbalance sensor (B2.2) is defective.
Measure supply voltage on plug S701 / Electronics (A1)
pin 6 – pin 1 (+5 VDC).
Measure on Electronics (A1) / plug S701, pin 6 – pin 2 and
pin 6 – pin 3 (square wave signal 5 V /100 Hz).
•
Electronics (A1) is defective.
CONTROL - ERROR 4.1
The lid switches for the left and/or right hook have opened during the
centrifugation run.
The rotor slows down without braking until it stops.
No further user operation possible except opening the lid.
•
Reset error code:
After the rotor has stopped perform a MAINS RESET. If the left
LED in the button
STOP / OPEN
is blinking after turning the centrifuge
on again, press this button so that the motor-driven lid locking
once again assumes the normal position (opened).
•
An emergency unlocking was performed during the centrifugation
run.
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Switches of the lid lock defective.
Check the function of both switches, see pg. 62, chapter 6.17,
item 21.
Pull out plug S703 and check the function of the switches at the
plug of the cable between pin 1 - pin 2 (left hook) and
pin 3 - pin 4 (right hook).
•
Electronics (A1) is defective.