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1
Scope of application
1.1
Use as braking device – part of the the protection device against overspeed for the car mov-
ing in upwards direction – permissible brake torques and tripping rotary speeds
1.1.1
Permissible brake torque when the braking device acts on the shaft of the traction sheave while the
car is moving upwards
Type
BFK464-25S.1
BFK464-25S
1.1.2
Maximum tripping speed of the overspeed governor and maximum rated speed of the lift
The maximum tripping speed of the overspeed governor and the maximum rated speed of the lift
must be calculated on the basis of the traction sheave's maximum tripping rotary speed as outlined
above taking into account traction sheave diameter and car suspension.
x π x n
D
TS
v =
60 x i
1.2
Use as braking element – part of the protection device against unintended car movement (act-
ing in up and down direction) – permissible brake torques, tripping rotary speeds and charac-
teristics
1.2.1
Nominal brake torques and response times with relation to a brand-new brake element
Type
BFK464-25S.1
BFK464-25S
Interim values can be interpolated
Explanations:
*
Nominal brake torque:
** Response times:
1.2.2
Assigned execution features
Type of powering / deactivation
Brake control
Nominal air gap
Damping elements
Overexcitation
Note: The English text is a translation of the German original. In case of any discrepancy, the German version is valid only.
Annex to the EC Type-Examination Certificate
No. EU-BD 851 of 2016-03-18
Nominal brake
torque* [Nm]
2 x 500 = 1000
2 x 600 = 1200
v
= Tripping (rated) speed (m/s)
D
= Diameter of the traction sheave from rope's center to rope's center (m)
TS
π
= 3,14
n
= Rotary speed (rpm)
i
= Ratio of the car suspension
Nominal brake
torque* [Nm]
2 x 500 = 1000
2 x 600 = 1200
Brake torque assured for installation operation by the safety component manufac-
turer.
t
time difference between the drop of the braking power until establishing X% of
X
the nominal brake torque, t
the examination recording
Maximum tripping rotary speed of the
traction sheave [rpm]
Maximum tripping
rotary speed [rpm]
455
800
optionally calculated t
50
continuous current / continuous current end
455
800
Maximum response times**
[ms]
without / with overexcitation
t
t
10
50
89 / 105
115 / 137
52 / 63
90 / 106
= (t
+ t
)/2 or value taken from
50
10
90
2-fold non-release voltage
t
90
141 / 169
129 / 149
parallel
0.45 mm
YES
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