Subject to changes without notice !
Änderungen vorbehalten !
Gearless Lift Machine
WSG-SF
Operating Instructions
EN
Code: GM.8.004284.EN
Date:
28. Jan 2020
Version: 0.16
Page: 75
Technical specifications
INTORQ | BA 14.0214 | 09/2017
14
The division of the brake circuits is done using a two-part armature disc with the associated compression
springs and electromagnetic coils. Each brake circuit can be operated individually due to the separate supply
lines for each coil group and armature disc segment (
33). Each brake circuit has a micro-switch which
monitors the switching state of the spring-applied brake. Using the associated switching device, the supply
voltage (AC voltage) is rectified and, when the brake is released, lowered after a short period of time. This
results in a reduction of the average electrical power of the brake.
The stator is designed to comply with heat class F. The limit temperature of the coils is 155 °C. The BFK464
spring-applied brake is designed for a maximum duty cycle of 60 % with holding current reduction. The per-
missible operating frequency is 180 1/h (maximum 240 1/h for short periods).
Certificate
3.1.2
Brakes
During the braking procedure, the pressure springs use the armature plate to press the rotor (which can be
shifted axially on the hub or on the toothed shaft) against the friction surface. The asbestos-free friction lin-
ings ensure high braking torque and low wear. The braking torque is transmitted between the hub and the
rotor via gear teeth.
3.1.3
Brake release
When the brakes are applied, an air gap "s
L
" is present between the stator and the armature plate segment.
To release the brake, the coils of the existing magnetic circuit are supplied with the correct DC voltage. The
resulting magnetic force works against the spring force to draw the armature plate segments to the stator.
This releases the rotor from the spring force and allows it to rotate freely.
3.1.4
Release monitoring
The spring-applied brake has a micro-switch for each braking circuit to monitor the switching state. When the
brake is released, the micro-switches toggle. This means that it is possible to exclude the drive being oper-
ated when the brake is closed. The micro-switches can be connected as both normally open and also nor-
mally closed.
For checking the correct functioning of the micro-switches, we recommend to check the switching status (see
Tab. 6) both when the brake is released and when the brake is applied.
Type
EC type examination certificate
Directive 2014/33/EC
BFK464-18
R
EU-BD 1056
BFK464-20
R
EU-BD 1034
Summary of Contents for WSG-SF Series
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