Holding Brake - Bosch Rexroth MS2N Operating Instructions Manual

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About this product

4.2.8 Holding brake

MS2N motors can optionally be provided with permanent magnet brakes. The
backlash-free holding brakes are operated according to the "electrically-re-
leased" principle (closed-circuit principle) and open upon applying the switching
voltage.
Number of operating cycles ≥ 5,000,000
●
The holding brakes with emergency stop function are intended to secure mo-
●
tor shafts at standstill. The holding brakes are no operation brakes to deceler-
ate motors in operation from speed.
In case of an emergency stop or voltage drop, the brake operation is only al-
●
lowed to a limited extend. Up to 500 breaking cycles from speed 3000 1/min
can be performed, whereas the maximum switched energy per emergency
stop of the brake must not be exceeded. The number of brake applications
per hour is 20, whereas a uniform scheduling is a precondition. For specifica-
tions about the max. switched energy per emergency stop, see
nical data holding brakes" on page 27
CAUTION
Impermissibly high wear due to breaking from speed by exceeding the specified
emergency stop properties.
Avoid deceleration from speed during setup mode.
Rated voltage
The rated voltage to apply the brakes is 24 V DC (±10%).
The voltage supply of the holding brake has to be designed so as to guarantee
under the worst installation and operation conditions that a sufficient voltage 24
V ±10% is available at the motor in order to release the holding brake.
The voltage drop ΔU on the brake supply can approximately be calculated for
copper conductors using the following formula:
ΔU Voltage drop [V]
ρ Specific resistance of copper
Cu
[Ω*mm 2 /m]
Fig. 4-6: Voltage drop of brake supply for Cu (copper) conductor
Bosch Rexroth AG R911347581_Edition 04
MS2N Synchronous Servomotors
Malfunctions due to wear
l Cable length [m]
q
Wire cross section [mm
I Rated current [A]
N
chapter "Tech-
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