Holding Brake - Siemens SIMODRIVE 611 Configuration Manual

5.4

Holding brake

5.4
Characteristics
• The integrated or mounted holding brake is used to clamp the motor shaft when the
• Motors with or without holding brake cannot be subsequently retrofitted! Motors with
• Restricted Emergency Stop operation is permissible. Up to 2000 braking operations can
• The rated voltage of the holding brake is 24 V DC.
Brake types
Brakes with different principles of operation are used.
• Permanent-magnet brake
• Spring-operated brake
Both of the brake types operate according to the closed-circuit principle.
Mode of operation of a permanent-magnet brake
The magnetic field of the permanent magnets results in a pulling force on the brake armature
disk. This means that in the no-current condition, the brake is closed and the motor shaft is
held.
When 24 V DC rated voltage is connected to the brake, the solenoid - through which current
flows - establishes an opposing field. This neutralizes the force of the permanent magnets.
Permanent magnet brakes have a proportionally stiff connection to the motor rotor. This is
the reason that this brake is almost without any play.
Caution
Motors with integrated permanent-magnet holding brake cannot be subject to axial forces at
the shaft end! This applies when installing the system and during operation.
General Section for Synchronous Motors
Configuration Manual, (PJAL), 11.2005 Edition, 6SN1 197-0AD07-0BP4
motor is at a standstill. The holding brake is not a working brake that is used to brake a
motor that is still rotating.
holding brake are longer by the mounted space required (refer to the dimension drawing).
be executed with 300% rotor moment of inertia as external moment of inertia from a
speed of 3000 RPM without the brake being subject to an inadmissible amount of wear.
The specific highest switching work for each emergency braking operation may not be
exceeded.
Caution
The rated voltage is 24 V DC +/- 10%. Voltages outside this tolerance bandwidth can
result in faults.
Inadmissible wear means that the braking function can no longer be guaranteed!
It is not permissible to exceed the above specified Emergency Stop conditions or to
repeatedly briefly accelerate the motor against a holding brake that is still closed. This
means that the switching times of the brakes and relays must be taken into account in the
drive control and enable functions.
Motor Components
5.4 Holding brake
5-7