Hettich ROTOFIX 32 - Lid Lock Control; Imbalance Switch-Off Adjustment

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5.5 Lid lock control
With the centrifuge ROTOFIX 32 the solenoid of the lid lock is energized automatically
when the rotor is at standstill.
After the lid is opened the solenoid will drop out again.
With this kind of lid lock control, the jumper for the lid lock control on the power board
(see below) may not be plugged.
Jumper für Verschlußansteuerung
Jum
p
er for lid lock control
Leistungsteil
Power board
Unwuchtschalter
Imbalance switch
Deckelverriegelun
g
Lid lock
Motor
Übertemp. -schalter
Overtemp. switch
Übertemp.-sicherung
Overtemp. fuse
Bremswiderstand
Brake resistor
Tac ho
Speedometer
S402L
S402N
L1
N
S402P
A 1
S404
S503
S501
2341
S405
12
3
4
S502
S401
UR US UT
12
3
45
5.6 Imbalance switch-off
The permissible imbalance is specified for rotor 1628 by the indication of the difference
in weight of opposite rotor positions.
When having a difference in weight within the range of 4g to 8g during run-up, the drive
has to switch off before reaching 1400 RPM.
The imbalance switch-off is adjusted by changing the distance of the imbalance switch.
With a test run with the indicated differences in weight the imbalance switch-off will be
checked.
Adjusting the imbalance switch:
• Loosen both screws at the angle bracket of the imbalance switch on the outer part of
the housing floor until you can shift it.
• Set the permissible imbalance by shifting the angle bracket.
• Tighten both screws at the angle bracket of the imbalance switch again.
• Check the imbalance switch-off with a test run.