9300 Servo PLC
System blocks
2.12 MCTRL_MotorControl
2-59
L
ServoPLC EN 2.0
Example:
• C0173 = 3 ð Switch-off threshold = 770 V
• C0172 = 10 ð “OV reduce” =10V
Threshold for brake torque derating
=
770 V
−
10 V
=
760 V
ð The brake torque is derated as of a DC-bus voltage of 760 V.
• Braking with active brake torque derating generates audible noises in the motor.
Tip!
A frequent overvoltage message indicates an incorrect dimensioning of the drive (the braking energy
is excessive).
• Remedy: 934X supply module or (additional) 935X brake units.
• When several controllers are operated simultaneously, an operation as DC bus connection
may be useful. Here, the generated brake energy of one drive can serve as drive energy for
another drive. The mains connections only supply the energy difference.
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