Geo Brick Drive User Manual
Motor Setup
213
I2T Protection, Magnetization Current: Ixx57, Ixx58, Ixx69, Ixx77
The lower values (tighter specifications) of the Continuous/Instantaneous current ratings between the Geo
Brick Drive and motor are chosen to setup I2T protection.
If the peak current limit chosen is that of the Geo Brick Drive (possible values 10, 16, or 30 Amps) then
the time allowed at peak current is set to 2 seconds.
If the peak current limit chosen is that of the Motor, check the motor specifications for time allowed at
peak current.
Examples:
For setting up I2T on a 5/10-Amp Geo Brick Drive driving a 3/9-Amp motor, 3 amps continuous
and 9 amps instantaneous will be used as current limits. And time allowed at peak is that of the
motor.
For setting up I2T on a 5/10-Amp Geo Brick Drive driving an 8/16-Amp motor, 5 amps
continuous and 10 amps instantaneous will be used as current limits. And time allowed at peak is
2 seconds.
For setting up I2T on a 15/30-Amp channel on a Geo Brick Drive driving a 12/45-Amp motor, 12
amps continuous and 30 amps instantaneous will be used as current limits. And Time allowed at
peak is 2 seconds.
A 4-axis 8/16 Amp Geo Brick Drive, is driving a 7/20 Amp AC Induction Motor on channel 4.
The continuous current limit is 7. The instantaneous current limit is 16.
#define Mtr4ContCurrent
7
; Motor #4 Continuous Current Limit [Amps]
-USER INPUT
#define Mtr4PeakCurrent
16
; Motor #4 Instantaneous Current Limit [Amps]
-USER INPUT
#define Ch4MaxADC
26.02 ; =16.26 for 5/10A
-USER INPUT
, see electrical specs
; =26.02 for 8/16A
-USER INPUT
, see electrical specs
; =48.08 for 15/30A
-USER INPUT
, see electrical specs
#define I2TOnTime
2
; Time allowed at peak Current [sec]
-USER INPUT
;#define ServoClk
P7003 ; [KHz] Computed in Dominant Clock Settings Section
#define Mtr4OutLimit
P7006 ; This is Ixx69, normally used in direct digital PWM
I457=INT(32767*( Mtr4ContCurrent*1.414/Ch4MaxADC)*cos(30))
Mtr4OutLimit=INT(32767*(Mtr4PeakCurrent*1.414/Ch4MaxADC)*cos(30))
I458=INT((Mtr4OutLimit*Mtr4OutLimit-I457*I457+I477*I477)*ServoClk*1000*I2TOnTime/(32767*32767))
Note
I2T settings should be corrected to reflect the (optimized)
magnetization current Ixx77, discussed in a subsequent section.
Magnetization Current: Ixx77
With Direct Micro-Stepping of PWM motor control, the magnetization current is set to the continuous
current limit divided by square root of 2:
I477=I457*0.7071
; Ixx77=Ixx57/SQRT(2)
Содержание Geo Brick
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Страница 286: ...Geo Brick Drive User Manual Appendix A 286 APPENDIX A Schematic Samples Watchdog X15 Inputs J6 J7...
Страница 287: ...Geo Brick Drive User Manual Appendix A 287 Outputs J6 J7 603793 109 and earlier Outputs J6 J7 603793 10A and later...
Страница 288: ...Geo Brick Drive User Manual Appendix A 288 Limits Flags J4...