Over Speed Protection; Speed Signal; Lid Contact; Imbalance Detection - Hermle Z 326 Service Instruction

7.2.6 Over speed protection

If the pre-selected rpm is higher as the permitted rpm of the rotor, the speed indication in the display will
be regulated to the max. speed permitted for this rotor.
The regulation will accelerate the rotor only to the permitted rpm of the rotor.

7.2.7 Speed signal

The actual speed is extracted by a hall-effect-sensor placed on the lower side of the motor.
There is a „preset/actual" comparison in the control board. Thereupon a new "preset-signal" is given by
the control board to the converter.
(See also photo of chapter 7.2.6.)

7.2.8 Lid contact

The micro switch in the mechanism of the lid lock controls the correct closing of the centrifuge lid.
The switch may never be bypassed.
The lid lock is unlatched by an electro motor, receiving its signal from the control board.
The actual state is indicated in the display.

7.2.9 Imbalance detection

The imbalance detection is done in two ways.
A micro switch that controls for certain rotors the displacement of the motor and shut off if there it too
much imbalance. The micro switch should be adjusted according to the instruction of the company.
(See chapter 7.4.13. See also list 6.3)
Page 9 of 48 SERVICE INSTRUCTION Z 326
7 SERVICE INSTRUCTIONS
© HERMLE Labortechnik GmbH
Version 01/2010