Functions
7.7 Application-specific functions
Inverter cabinet units
382
Operating Instructions, 12/2014, A5E32923362A
DC braking initiated by a control command
1.
The higher-level control issues the command for DC braking, e.g. using DI3:
p1230 = 722.3.
2.
DC braking starts.
If the higher-level controller withdraws the command during DC braking, the inverter
interrupts DC braking and the motor accelerates to its setpoint.
DC braking when the motor is switched off
1.
The higher-level controller switches the motor off (OFF1 or OFF3).
2.
The motor brakes along the down ramp to the speed for the start of DC braking.
3.
DC braking starts.
Settings for DC braking
Parameter Description
p0347
Motor de-excitation time (calculated after the basic commissioning)
The inverter can trip due to an overcurrent during DC braking if the de-excitation time is
too short.
p1230
DC braking activation (factory setting: 0)
Signal source to activate DC braking
•
0 signal: DC braking deactivated
•
1 signal: DC braking activated
p1231
DC braking configuration (factory setting: 0)
0
4
5
14
No function
DC braking
DC braking for OFF1/OFF3
DC braking below the starting speed
p1232
DC braking braking current (factory setting 0 A)
p1233
DC braking duration (factory setting 1 s)
p1234
DC braking start speed (factory setting: 210000 rpm)
r1239
DC braking status word
.08
.10
.11
.12
.13
1 = DC braking active
1 = DC braking ready
1 = DC braking selected
1 = DC braking selection internally locked
1 = DC braking for OFF1/OFF3
Summary of Contents for SINAMICS G120P
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Page 16: ...Table of contents Inverter cabinet units 16 Operating Instructions 12 2014 A5E32923362A ...
Page 432: ...Application examples Inverter cabinet units 432 Operating Instructions 12 2014 A5E32923362A ...
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