4.2.8 Holding brakes
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 chapter "Tech-
nical data holding brakes" on page 24
Malfunctions due to wear
Impermissibly high wear due to breaking from speed by exceeding the specified
emergency stop properties.
Impermissibly high number of braking applications 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
Cu
Specific resistance of copper
[Ω*mm
2
/m]
l Cable length [m]
q
Wire cross section [mm
2
]
I
N
Rated current [A]
Fig. 4-6: Voltage drop of brake supply for Cu (copper) conductor
MS2N Synchronous Motors Bosch Rexroth AG
About this product
DOK-MOTOR*-MS2N*******-IT03-EN-P
23/95
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