Set Current – BONCURS Controls

The Set Speed command is used to set the motor controller’s target current output. The motor controller’s current operating mode will be set to CURRENT mode. The command timeout counter is reset when this command is received.

If the commanded current is less than the configured minimum current, the motor is stopped unless the CAN bus command is sent with a specified Current Off Delay.

Command Parameters

Parameter	Units	Description
Current	amps	Target motor current, in amps
Current Off Delay	sec	(CAN bus only) Optional parameter. If commanded, the current controller will be prevented from switching off modulation for target currents less than the configured minimum current for this amount of time. This parameter is only functional when operating an FOC motor.

[reveal1 title=”Web App”]

Switch to Operate tab
From the Control Mode selection box, select Current Control
Under Current Control, specify a minimum and maximum commandable amperage
a. Drag the slider to change the commanded current
OR
b. Type a current value into the manual entry box and click Set Current

[/reveal1]

[reveal1 title=”Serial Interface”]

This command follows the standard VESC serial packet format.

Command Structure

Byte	Datatype	Value	Scaler	Description
0	uint8	`0x02`		Packet start byte
1	uint8	`0x05`		Packet length
2	uint8	`0x06`		Packet ID [COMM_SET_CURRENT]
3	int32		1000	Target current, in amps
7	uint16			CRC16 of data section
9	uint8	`0x03`		Stop byte

Command Examples

The following table shows an example command to set the target current to 5 amps.

	Start Byte	Length	PID	Current	CRC16	End Byte
Hex	`0x02`	`0x05`	`0x06`	`0x00001388`	`0x8B25`	`0x03`
Integer	2	`5`	6	5000	35621	3

The following table shows an example command to set the target current to -10 amps.

	Start Byte	Length	PID	Current	CRC16	End Byte
Hex	`0x02`	`0x05`	`0x06`	`0x`FFFFD8F0	`0x3AD4`	`0x03`
Integer	2	`5`	6	-10000	15060	3

Command Response

There is no response for this command.

[/reveal1]

[reveal1 title=”CAN Bus Interface”]

This command follows the standard VESC CAN command frame format.

The CAN bus command has two formats – one with the optional minimum current controller timeout and one without.

Without the timeout:

Packet Identifier:	`0x0`1 [CAN_PACKET_SET_CURRENT]
Data Length Code:	4
Contents:	[int32] Target current * 1000

With the timeout:

Packet Identifier:	`0x0`1 [CAN_PACKET_SET_CURRENT]
Data Length Code:	6
Contents:	[int16] Current timeout * 1000 [int32] Target current * 1000

Command Response

There is no response for this command.

[/reveal1]