Siemens SINAMICS G110D Operating Instructions Manual page 133

Parameterizing DC braking
Table 6- 38
Parame-
ters
P003= 3
P1230
P1232=
P1233=
P1234=
P0347=
DC braking using an external command
This allows DC braking to be activated using a signal from an external source (BICO). The
function remains active as long as the external signal is active. The use of this function is
explained in the sequence below.
1. The function is enabled and selected using BICO parameter P1230 (see figure below).
2. The Inverter pulses are inhibited for the duration of the de-magnetizing time P0347.
3. The requested braking current P1232 is impressed as long as the DC braking is enabled
(P1230=1) and the motor is braked. This state is displayed using signal r0053 bit 00.
4. After the DC braking has been cancelled, the motor accelerates back to the setpoint
frequency until the motor speed matches the Inverter output frequency.
5. If any faults occur during P1230=1, the DC current is set to zero. The motor does not
ramp-up even if the fault is acknowledged; a new ON command is necessary.
6. If the DC brake is enabled again, the braking current P1232 is impressed as long as
P1230=1.
SINAMICS G110D
Operating Instructions, 07/2016, FW V3.63, A5E36768472B AB
Parameters to enable and set DC braking
Description
User access level
3: Expert
Enabling DC braking using an external command
Enables DC braking via a signal that was used by an external source (BICO). The func-
tion remains active as long as the external signal is active.
Current, DC braking (entered as a %)
Defines the strength of the direct current in [%] with respect to the rated motor current
(P0305)
Enable and duration of the DC braking for OFF1 or OFF3 command (entered in s)
Defines the duration of the DC braking in seconds after an OFF1 or OFF3 command.
P1233 = 0 deactivates DC braking for an OFF1 and OFF3 command.
Starting frequency of DC braking (entered in Hz)
Sets the speed threshold for the start of DC braking.
Demagnetizing time of the motor
The inverter calculates this value from the motor data during commissioning. Only
commissioning engineers, who have the appropriate experience, may change the pa-
rameter values. The inverter can trip due to an overcurrent during DC braking if the
demagnetizing time is too short.
Functions
6.9 Technological functions
133