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