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Hettich EBA 21 Repair Instructions

Hettich EBA 21
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6.7 Setting the display contrast
The contrast of the display has been preset by the manufacturer. However, you can
readjust it.
Use a screwdriver with insulated shank to make this setting as there is a risk of short
circuit on the printed circuit board.
Use the screwdriver to set the contrast on the trimming potentiometer on the rear side of
the control panel (see figure).
Rear side of the control panel:
11
1610
432 10
trimming-potentiometer for LCD-contrast
X1
X100
X101
X3
1
4
6.8 Imbalance switch-off
The permissible imbalance is specified for rotor 1416 by the indication of the difference
in weight of opposite rotor positions.
When having a difference in weight within the range of 7g to 15g during run-up, the
drive has to switch off before reaching 1500 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:
Old version of the imbalance switch:
Set the permissible imbalance by bending the rocker switch of the imbalance switch
carefully.
Check the imbalance switch-off with a test run.
New version of 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.

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Hettich EBA 21 Specifications

General IconGeneral
TypeCentrifuge
Capacity6 x 15 ml
WeightApprox. 9 kg
Max. Capacity6 x 15 ml
Timer1 - 99 min, continuous run
Power Supply230 V, 50/60 Hz
Temperature RangeNot applicable

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