Lenze MDSLS Servo spindle motor - Manual (Page 17)

Technical data
Rated data
Holding brake (option)
3

17 BA 33.0003 EN 1.0
3.3 Holding brake (option)
The MDXLS servo motors can optionally be fitted with a spring-operated brake.
The brakes used are not fail-safe brakes in the sense that a torque reduction cannot occur
through uncontrollable interference factors, such as through the entrance of oil.
With long motor supply cables, the ohmic voltage drop along the cable must be observed
and compensated for by a higher voltage at the cable entry.
The following applies to Lenze system cables:
U * [V] = U [V] + (0 08

V

⋅ L [m] ⋅ I [A])
U* Resulting supply voltage
U * [V] = U
B
[V] + (0.08

V
m ⋅ A

⋅ L [m] ⋅ I
B
[A])
U
B
Rated voltage of the brake
L Length of cable
I
B
Rated current of the brake

Stop!
If no suitable voltage (incorrect size, incorrect polarity) is applied to the brake,
the brake is applied and can overheat and be destroyed by the motor which
continues to run.
Theshortestoperating times ofthe brakesare achieved by switching the voltageon theDC
side and a suppressor circuit (varistor or spark suppressor). Without suppressor circuit, the
operating times may increase. A varistor/spark suppressor limits the breaking voltage
peaks. It must be observed that the power limit of the suppressor circuit is not exceeded.
It is dependent on the brake current, brake voltage, disengagement time and the
switchings per time unit.
Thesuppressorcircuitis alsorequired for radiointerference suppressionand forincreasing
the service life of the relay contacts (external, not integrated in the motor).
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