Setting motor parameters, Peak current, Current control – RMS Technologies 4-AXIS CONTROLLER/DRIVER User Manual

Page 21: Velocity setting, Starting velocity, Driving ramps

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S I X P A C K / Q U A D P A C K

21

8.3 Setting motor parameters

16 bit or 32 bit parameters, marked with “#”, are transferred with least significant byte
(Bit 0 – 7)
first.

Peak current

(settings are done for pairs of motors, i.e. each two motors 0 + 1, 2 + 3 respectively 4 + 5 have the
same peak current. Only the values set for motor-numbers 0,2 and 4 are valid.)

CMD

$10

P0

motnr (0...5)

P1

value (0..255):Sixpack: Imax=0,8A * value/256
Quadpack Imax=1,5A * value/256 * DIPsetting (0%, 33%, 66%, 100%)

Current control

Note for energy saving: Power consumption can be reduced drastically when power-down current
(I0) is set to 0%, i.e. P1=8 for all (unused) motors.

CMD

$11

P0

motnr (0...5)

P1

I0: power down-current (0..8): (0=100%, 75, 50, 38, 25, 19, [13, 9,] 0%)

P2

I1: current when motor stands still

(s.a.)

P3

I2: current for constant velocity (s.a.)

P4

I3: current for acceleration (s.a.)

P5,6 #

T0(*): (1..65535): power down-delay time in increments of 2 ms
(Firmware before v1.40 required even values!)

(*) Note: T0 is also needed in CMD $15.

Velocity setting

(global setting for all motors, change only with stopped motors!)

CMD

$12

P0

clkdiv (0..31): s. calculation of step frequency

(default: clkdiv=5)

Starting velocity

(change only with stopped motors!)

CMD

$13

P0

motnr (0...5)

P1,2 #

vmin (0..511): velocity used in combination with div

i

=3 for searching of the reference-

switch. The fastest possible vmin will be calculated automatically when vmin=0 is set.

vmin <= 250Hz / fminsteps
vmin
<= vstart

(fminsteps is the microstep frequency when velocity = 1 and div

i

=3 is choosen)

P3,4 #

vstart (1..511):
starting and ending velocity for acceleration ramp. Limited by firmware to

0 < vstart < ( 512 shr(3-div[i]))-1 (e.g. div[i]=2 -> 0 < vstart < 256)

P5

div

i

(0..3): s. calculation of step frequency

(default: div

i

=2)

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