Siemens SINAMICS G110, Operating Instructions Manual

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04/2005 Using the SINAMICS G110
SINAMICS G110 Operating Instructions
6SL3298-0AA11-0BP0
61
4.4 OFF and Braking Functions
4.4.1 OFF1
This command (produced by canceling the ON command) causes the inverter to
come to a standstill at the selected ramp-down rate.
Parameter to change ramp-down time see P1121
NOTES
¾
ON and the following OFF1 command must have the same source.
¾
If the ON/OFF1 command is set to more than one digital input, only the last set
digital input is valid.
¾
OFF1 can be combined with DC braking or Compound braking.
4.4.2 OFF2
This command causes the motor to coast to a standstill (pulses disabled).
NOTE
The OFF2 command can be actuated from any command source simultaneously.
4.4.3 OFF3
An OFF3 command causes the motor to decelerate rapidly.
¾
Ramp down time: see P1135
NOTE
OFF3 can be combined with DC braking or Compound braking.
4.4.4 DC braking
2
Warning
During DC braking the components of the kinetic energy of the motor and the
driven load are converted into thermal energy in the motor. If this power loss is too
high or if the braking operation takes too long, then this can cause the motor to
overhead.
DC braking is possible together with OFF1 and OFF3. A DC current is applied to
stop the motor quickly and hold the shaft stationary until the end of the braking
period. The stator resistance value must be entered into P0350 for the DC braking
to work correctly.
¾
Enable DC braking: see P0701 to P0704
¾
Set DC braking period: see P1233
¾
Set DC braking current: see P1232
¾
Set DC braking start frequency: see P1234
2
P1234 valid for firmware 1.1