Write Inverter Control Word with LS_InverterControl

LS_InverterControl is used to control an EtherCAT AC drive. See AC Drive Control Word State Machine for the operation state machine of an AC drive using the command bits.

  • LS_Connect must be used before executing this function block.

  • The control word is an object used in the AC drive’s EtherCAT PDO.

  • The following examples can be found in the XMC_ACDrive_FBs.zip downloadable from Example Applications.

Element Name Element Type Description
Enable Input Level detected request to execute the function block.
Axis Input/Output Specify the axis to control.
SwitchOn Input Switch On bit of the control word.
VoltageEn Input Voltage Enable bit of the control word.
QuickStop Input Quick Stop bit of the control word.
EnableOP Input Enable operation bit of the control word.
EnableRamp Input Enable ramp bit of the control word.
UnlockRamp Input Unlock Ramp bit of the control word.
ReferenceRamp Input Reference ramp bit of the control word.
FaultReset Input Fault reset bit of the control word.
Halt Input

Halt bit of the control word.

Note: This input is not used.
Done Output Indicates the control word was sent to the AC drive.
Error Output Indicates the function block has an error.
ErrorID Output Error Identification for the function block.

Note:

  • Bit 0 -> SwitchOn in the Control Word.

  • Bit 1 -> VoltageEn in the Control Word.

  • Bit 2 -> QuickStop in the Control Word.

  • Bit 3 -> EnableOp in the Control Word.

  • Bit 7 -> FaultReset in the ControlWord.

Extra Command Bit Functionality:

Bit Value Description
4 (Enable Ramp) 0 Holding previous operation status.
1 Inverter operation by command bit.
5 (Unlock Ramp) 0 Holding of output frequency.
1 Operating to target frequency.
6 (Reference Ramp) 0 Input target frequency as 0.
1 Input target frequency as setting value.
8 (Halt) X Unusued.

To enable an AC drive LS_InverterControl must be executed 3 separate times with different command bits set. This is to traverse the EtherCAT AC drive state machine from section 2.

After the AC drive has been enabled, only the EnableOP input needs to be set to ‘0’ to disable the drive.

To stop AC drive motion and leave the drive enabled, Only the QuickStop bit needs to be set to ‘0’. Motion will occur if QuickStop is set back to ‘1’ and executing the LS_InverterControl function block.

To stop AC drive motion and disable the drive, the QuickStop and EnableOP bits need to be set to ‘0’.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

LM900