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Geo Brick Drive User Manual
Drive Structure and Troubleshooting
267
Reading IGBT Temperature and Bus Voltage
IGBT Temperature reading:
The baseline IGBT temperature is set at 25°C (77°F), with ADC bits [11-4] value of $21 (Hexadecimal).
Above the baseline temperature, every additional 2.13°C (3.834°F) correspond to $1 hexadecimal ADC
count. The maximum IGBT temperature for the Geo Brick Drive is about 125°C (257°F), or $5B
Hexadecimal ADC counts.
Bus Voltage reading:
Every ADC $1 Hexadecimal count corresponds to 5.875 Volts DC. See electrical specifications for over-
voltage, shunt resistor turn-on,
The following, is an example PLC that updates the DC Bus Voltage (converted to AC) every 3 seconds,
and Axis-1 IGBT temperature in degree Celsius every 30 seconds:
End Gat
Del Gat
Close
// Substitutions and definitions
#define IC0StrobeWord
I7006 ; Servo IC#0 ADC Strobe Word
#define Mtr1ADCB
M7050 ; Motor 1 ADC Phase B
#define ACBusVoltage
M7051 ;
#define LastIC0Strobe
P7050 ;
#define CS1Timer1
I5111 ; Coordinate System &10 Countdown Timer 1
#define CS1Timer2
I5112 ; Coordinate System &10 Countdown Timer 2
#define IGBTAxis1Temp
M7054 ;
#define BaselineTemp
P7052 ;
#define TempConstant
P7053 ;
#define AmbientTemp
P7054 ;
Mtr1ADCB->Y:$78006,4,8
; Channel 1 ADC Phase B
ACBusVoltage->*
; Self-referenced M-variable to store Bus Voltage reading
IGBTAxis1Temp->*
; Self-referenced M-variable to store IGBT Temperature reading
LastIC0Strobe= 0
; 0 at download
IGBTAxis1Temp= 0
; 0 at download
BaselineTemp= 33
; $21 at 25 Degree Celsius
TempConstant= 2.13
; 2.13 Degrees C for each additional Hex Count
AmbientTemp= 25
; Ambient at 25 degrees Celsius
// This PLC example updates AC Bus Voltage reading (M7051) every 3 seconds and
// Axis-1 IGBT Temperature reading (M7054) in degree Celsius every 30 seconds
Open plc 1 clear
If (CS1Timer2<0)
; Read IGBT Temperature
IC0StrobeWord = $300FFF
; Set Strobe Word for Enhanced Mode, IGBT Temperature
CS1Timer2=50*8388608/I10 While(CS1Timer2>0) Endw ; 50 msec Delay
IGBTAxis1Temp=(Mtr1ADCB-BaselineTemp)* TempC AmbientTemp
CS1Timer2=30000*8388608/I10 ; 30 sec IGBT Temperature Update
EndIF
// AC Bus Voltage (M7051)
If (LastIC0Strobe != IC0StrobeWord)
IC0StrobeWord = $301FFF; Set ADC Strobe Word for Enhanced Mode, Bus Voltage
LastIC0Strobe = IC0StrobeWord
CS1Timer1= 50*8388608/I10 While(CS1Timer1>0) Endw ; 50 msec Delay
EndIf
ACBusVoltage=(Mtr1ADCB*5.875)/sqrt(2)
; Convert to AC
CS1Timer1= 3000*8388608/I10 While(CS1Timer1>0) Endw ; 3 sec Bus Voltage update
Close
Note
Toggling the ADC Strobe Word at a very fast rate is not desirable.
Handshaking between the PMAC and the amplifier processor may
take to up to 50 milliseconds.
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...