Configuration Manual AC Induction Motors 1PH4 - Siemens ...

3.3 Holding brake
© Siemens AG 2003 – 2006 All rights reserved
AC Induction Motors, 1PH4 (APH4) – 04.06 Edition
Motor Components
3.3 Holding brake
Application
A single–disk brake can be fitted at the DE to lock the motor rotor without any play
at standstill.
Design
The DE bearing end shield is supplied with an external bearing cover (special version)
as a fastening part for the magnet block (brake pad). The magnet block can
be attached by the customer. The armature disk of the brake is screwed on to the
output element (belt pulley or similar).
The brakes are brushless and maintenance free. Both braking surfaces are made
of metal. Retrofit is not possible.
Table 3-3 Degree of protection and supply voltage
Degree of protection IP 00
Supply voltage 24 V DC �10 %
Principle of operation
The brakes work according to the working principle, i.e. the brake is open when
de–energized.
!
Only apply the brake when the motor is at a standstill.
The holding brake must be released (no current) when changing–over the gearbox
ratio and while the motor is running. There is no remaining torque after release.
After mounting the motor, the brake must be checked to ensure that is correctly
functioning.
Caution
The holding brake is only designed for a limited number of emergency braking
operations. It is not permissible to use the brake as operating brake.
Before removing the magnet block, the holding brake must be under power to
prevent the diaphragm spring from overexpanding.
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