Siemens SINAMICS G110M - Page 219

Functions
8.9 Application-specific functions
SINAMICS G110M Operating Instructions
Operating Instructions, 04/2015, FW V4.7.3, A5E31298649B AD
219
DC braking when falling below a starting speed
1. The motor speed has exceeded the starting speed.
2. The inverter activates the DC braking as soon as the motor speed falls below the starting
speed.
DC braking when a fault occurs
1. A fault occurs, which initiates DC braking as response.
2. The motor brakes along the down ramp to the speed for the start of DC braking.
3. DC braking starts.
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 control 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 control switches off the motor (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: Deactivated
• 1 signal: Active
p1231
Configuring DC braking (factory setting: 0)
0
4
5
14
No DC braking
General release for 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)