PowerTec DFS-1 Drive Regenerative Current Limit, Pulse Multiplier, Modulation and Operation Modes

limit the output DRIVE current to 150%. This parameter CANNOT OVERRIDE that limit, but this parameter may be set for an ultimate current limit on drives which are built with more capability than the motors they run. In this way, short term 300% current ratings can be obtained.

45.DRIVE REGENERATIVE CURRENT LIMIT

USE PARAMETER #45 TO SET THE REGENERA- TIVE CURRENT LIMIT OF THE DRIVE.

RANGE OF VALUES: 0000 0000h to 0000 0096h 0 to 150% (decimal)

Default Value: 0000 0032h 50% (decimal)

Parameter #44 allows current limit settings of up to 255% and must be set in terms of MOTOR current. Other circuitry in the motor control will limit the output DRIVE current to 150%. This parameter CANNOT OVERRIDE that limit, but this parameter may be set for an ultimate current limit on drives which are built with more capability than the motors they run. In this way, short term 300% current ratings can be obtained.

46.PULSE MULTIPLIER

USE PARAMETER #46 TO SET THE VALUE BY WHICH THE ENCODER PULSE WILL BE MULTIPLIED.

RANGE OF VALUES: 0000 0000h to 0000 0003h

	0 to 3	(decimal)
Default Value:	0000 0002h	2 (decimal)
0= X 1	2= X 4
1= X 2	3= Commutation Mode

Encoder loss detection applies only when pulse multiplier is set to 4X.

47.MODULATION AND OPERATION MODES

USE PARAMETER #47 TO SET REGEN / NON- REGEN AND MODULATION MODES.

RANGE OF VALUES: 0000 0000h to 0001 0001h no decimal significance

Default Value: 0000 0000h no decimal significance

Parameter #47 contains two pieces of informa- tion.

VL4 VL3 sets the operational mode of the drive: 0000h sets the drive for non-regenerative

operation.

0001h sets the drive for regenerative operation.

VL2 VL1 sets the modulation mode for the drive:

0000h sets the modulation for bottom transistors only.

000h1 sets the modulation for top and bottom transistors.

Normal setup is:
Non-regenerative drives:	0000 0000h
Regenerative drives:	0001 0001h

Normally, in POWERTEC Brushless DC motor controls, non-regenerative drives modulate the bottom transistors only (this generates less heat and makes them more efficient). Regenerative drives modulate both top and bottom transistors for better control. There are some cases where modulating both top and bottom transistors in a non-regenerative drive may be desirable. This can be done by setting VL2 VL1 to 0001h.

Note: If regenerative mode is used, the drive may require an optional DC bus loader to dissipate the regenerative energy and avoid over voltage faults.

48.JUMP OR MOP OPERATION

USE PARAMETER #48 TO SET TEMPORARY OR PERMANENT UP/DOWN SPEED/RATIO CHANGES.

RANGE OF VALUES: 0000 0000h to 0000 0001h

0 to 1	(decimal)
Default Value: 0000 0000h	0 (decimal)

Parameter #48 selects whether the change in speed or ratio made by the up/down inputs is a temporary change which lasts as long as the up or down input is active (JUMP mode), or whether the change will remain after the up/down input has been released (MOP mode). The up/down functions may be generated by software through setting of param- eter #3.

Page 32	DFS-1 Manual	Revised 7/95
		POWERTEC Ind. Corp.©