Wittur WSG-S0 Serie Instrucciones De Funcionamiento página 38

1 Scope of application
Use as braking device – part of the the protection device against overspeed for the car mov-
1.1
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
BFK464-18S.2
BFK464-18S
BFK464-18S
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.
n
v =
i
Use as braking element – part of the protection device against unintended car movement (act-
1.2
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
BFK464-18S.2
BFK464-18S
BFK464-18S
Interim values can be interpolated
Explanations:
* Nominal brake torque:
** Response times:
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 862 of 2016-03-18
Nominal brake
torque* [Nm]
2 x 165 = 330
2 x 195 = 390
2 x 225 = 450
v = Tripping (rated) speed (m/s)
iameter of the traction sheave from rope's center to rope's center (m)
D =
TS
= 3,14
n = Rotary speed (rpm)
i = Ratio of the car suspension
Nominal brake
torque* [Nm]
2 x 165 = 330
2 x 195 = 390
2 x 225 = 450
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
455
optionally calculated t
50
455
800
455
Maximum response times**
[ms]
without / with overexcitation
t t
10 50
39 / 43 66 / 71
27 / 32 46 / 52
46 / 52
27 / 32
= (t + t )/2 or value taken from
50 10 90
t
90
94 / 99
65 / 72
65 / 72
Page 1 of 2