OPERATING MANUAL DAF290 MAINTENANCE
ThyssenKrupp Aufzugswerke GmbH
7.3 Setting braking deceleration
If this brake adjustment is changed, the configuration complying with
EN81/A3 is invalid and must be checked!
However, if it is necessary to set the brake subsequently, proceed as follows.
The setting of the braking torque must be carried out system-specifically and
uniformly by means of the initial tension of the brake springs at the two brake
shoes.
The DAF290 brake setting carried out with only one effective brake shoe in
each case with the elevator car at rated load in a descending run (full down)
corresponding to the value specified in table below.
In a brake test, the braking distance (s
a
) with one braking shoe should
be below the specified value.
a
≤
≤≤
≤ 5 ≤
≤≤
≤ 10 ≤
≤≤
≤ 15
Important: In the case of repeated braking, the brake disc heats up, which
causes braking behaviour and setting values to change. It is therefore
recommended to have a sufficiently long cooling-down phase between tests.
Setting braking force (contact pressure of the brake shoe)
The braking force setting is made by changing the pressure spring
pretension.
The system-specific deceleration is set by turning the pressure spring
clamping screw at the brake shoe. This setting must be secured by tightening
the counter nut. Repeat this procedure at the second brake shoe
Important: The maximum initial tension distance for one shoe is 18 mm
(corresponds to approx. 9 screw revolutions).
The brake is set to this value when it leaves the factory. It must not be
exceeded.
If the maximum value is exceeded, this can impair the brake function.
Caution: When setting, the test switch screw must not touch the switch
contact because otherwise the switch will be damaged.
Note: Brake test switches must be checked or readjusted after adjusting the
brake.
See 7.2
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