Hermle Z 326 Service Instruction page 35

Mechanic micro switch:
Replacing the imbalance micro switch
• Remove the lower covering of the front housing as described in chapter 7.4.1.
• Remove the housing as described in chapter 7.4.5.
• Remove all defective parts as imbalance micro switch, angles or spring plates.
Adjusting screw
• Re-assemble the unit in reverse order.
Adjustment of the imbalance micro switch
Precondition:
• Put in a rotor into the unit and fasten the rotor nut.
• Load one hole of the rotor with the listed imbalance shut off weight in the table 6.3.
• Adjust the acceleration- (accel) and the deceleration level (decel) on the control board to level 9.
• Start the centrifuge. The unit must shut off when reaching the listed speed of the resp. rotor
(see table 6.3).
• In case the unit does not shut off you have to loosen the fixing screws of the imbalance sensor. Adjust
the imbalance sensor more sensitive with the adjusting screw (clockwise).
• Repeat those steps as often as the listed value of the table 6.3 is reached.
• Switch off the unit and fill the rotor with the permitted imbalance weight.
• The unit must not shut off after the start. In case the unit shuts off, you have to lower the sensibility of
the sensor.
• In case you have to re-adjust the imbalance sensor when testing the permitted imbalance weight, you
have to repeat the procedure with the imbalance shut off.
Page 35 of 48
To adjust the imbalance value, you have to bridge the movement sensor with an
adapter at SV2 (speed/imbalance) on the control unit.
You can demand this bridge at Hermle Labortechnik GmbH.
SERVICE INSTRUCTION Z 326
7 SERVICE INSTRUCTIONS
Distance approx. 0,7 mm
© HERMLE Labortechnik GmbH
Version 01/2010