Energy saving function for holding brakes
Decrease brake voltage
The control voltage of the holding brake in MS2N holding brakes can be reduced
after executing the switching operation "Open brake" by using control modules
(e.g. brake control module HAT02.1-003). By decreasing the control voltage, en-
ergy can be saved of up to 50% and the self-heating of the motor can be re-
duced.
To decrease the control voltage of MS2N holding brakes, the following condi-
tions apply:
● Maximum decrease of control voltage to U
N
≥ 17 V
DC
● Waiting time after releasing the holding brake is at least 200 ms
● Decreasing the control voltage by voltage control or pulse width modulation
with a PWM cycle frequency ≥ 4 kHz
Refer to the instructions in the control module documentation.
Refer to the notes for dimensioning of the cable length and cable
cross-section of brake cables.
Safety instructions holding brakes
The permanent magnet brake of a MS2N motor is no safety brake. This means, a
torque reduction by non- influenceable disturbance factors can occur. Especially
for use in vertical axes.
Grievous bodily harm due to dangerous move-
ments from falling or dropping axes!
Additionally secure vertical axes to prevent them from sinking or descending af-
ter having shutdown the motor, for instance as follows:
● Lock the vertical axes mechanically,
● External brake, arrestor, clamping device.
● Weight compensation of the axes
The holding brake itself is not suitable for personal protection. Ensure protec-
tion of individuals by superordinate protective measures such as cordoning off
of danger zones using protective fences or grids.
For European countries, additionally comply with the following standards and
guidelines, e.g.
● EN 954; ISO 13849-1 and ISO 13849-2 Safety-related parts of control units
MS2N Synchronous Servomotors
29/101
About this product
R911347581_Edition 04 Bosch Rexroth AG
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