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Geo Brick Drive User Manual
Drive Structure and Troubleshooting
268
Calculating Motor Current Output Example
Channel 1 on a 5/10A Geo Brick Drive is driving a commutated brushless motor. The instantaneous
current output can be calculated as follows:
// Substitutions and definitions
#define MaxADC
P7055 ; Max ADC reading. See electrical specifications
#define MaxOutput
P7056 ; Maximum Command Output
#define Mtr1ActQuadCurrent
M175
; Motor 1 Actual Quadrature Current
#define Mtr1ActDirectCurrent M176
; Motor 1 Actual Direct Current
#define GlobalVar1
P7057 ; General Purpose Global Variable 1
#define GlobalVar2
P7058 ; General Purpose Global Variable 2
#define Axis1CurrentOutput
P7059 ; User variable to store Axis-1 current
Mtr1ActQuadCurrent->X:$0000B9,8,16,S
; #1 Actual quadrature current (Suggested M-var)
Mtr1ActDirectCurrent->Y:$0000B9,8,16,S
; #1 Actual direct current (Suggested M-var)
MaxADC= 16.26
; = 16.26 for 5/10A
-User Input
; = 26.02 for 8/16A
; = 48.08 for 15/30A
MaxOutput=32767*0.866
; 32767 * sqrt(3)/2
// This PLC returns Axis-1 instantaneous current output (P7059) in Amps
Open Plc 1 Clear
// Quad^2 + Direct^2
GlobalVar1=(Mtr1ActQuadCurrent*Mtr1ActQuadC(Mtr1ActDirectCurrent*Mtr1ActDirectCurrent)
// Get SQRT
GlobalVar2=exp(0.5*ln(GlobalVar1))
// Convert to Current. Assume most efficient bus voltage
Axis1CurrentOutput=MaxADC*GlobalVar2/(MaxOutput*1.414)
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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...