892 HEIDENHAIN Technical Manual MANUALplus 620
Limitation of the
braking power
The use of energy recovery and/or a braking resistor must also be taken into
account when braking the drives in an emergency stop or in the event of a
power failure:
Inverter without energy recovery (with braking resistor):
MP_motPbrMax: Calculate the maximum braking power from the formula
below.
MP_motPbrMaxAcFail: Calculate the maximum braking power from the
formula below.
Inverter with energy recovery (without braking resistor):
Enter MP_motPbrMax = 0 so as not to limit the braking power.
MP_motPbrMaxAcFail: The braking power cannot be limited in a power
failure. Axes and spindles will coast to a stop.
Inverter with energy recovery and additional braking resistor:
Enter MP_motPbrMax = 0 so as not to limit the braking power.
MP_motPbrMaxAcFail: Calculate the maximum braking power from the
formula below.
Calculation of maximum braking power:
For inverters with braking resistor, calculate the maximum braking power
from the following formula:
R = Braking resistance [Ω]
U
Z
= DC-link voltage [V]
Max. braking power
U
Z
2
R 1000⋅
--------------------------=
If the braking power defined in MP_motPbrMax or
MP_motPbrMaxAcFail is smaller than the one defined in
MP_maxAcceleration, the braking power from MP_maxAcceleration is
used for braking.
If after entry of a value in MP_motPbrMax or MP_motPbrMaxAcFail,
the mechanics are overloaded by the braking process, reduce the value
until you have found an optimum between braking time and mechanical
load.
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