Installation manual
Geo Direct PWM Amplifier
Power PMAC3 Drive Setup 37
POWER PMAC3 DRIVE SETUP
Caution
The ADC Strobe Word, Gate3[i].AdcAmpStrobe, must be set to
$FFFFFC for proper operation in default mode. Failure to do so could
result in damage to the amplifier.
Key Gate Parameters
The following Gate-specific parameters are essential for the proper software setup of the Geo Direct
PWM Drive:
Structure Element
Description
Typical/Default
Notes
Sys.WpKey
PMAC3 Write Protection
0
$AAAAAAAA to
allow writing
Gate3[i].PhaseFreq
Phase Frequency
9000
9.00 KHz Phase
Gate3[i].ServoClockDiv
Servo clock divider
3
2.25 KHz Servo
Gate3[i].HardwareClockCtrl
Hardware Clocks
$55555403
2.50 MHz ADC Clock
Sys.ServoPeriod
=1000*(Gate3[i].ServoClockDiv+1)/Gate3[i].PhaseFreq
Sys.PhaseOverServoPeriod
= 1 /(Gate3[i].ServoClockDiv + 1)
Gate3[i].AdcAmpStrobe
ADC Strobe Word
$FFFFFC
Default Mode
Gate3[i].Chan[j].OutputMode
Output mode
0
PWM output
Note
Sys.ServoPeriod and Sys.PhaseOverServoPeriod must be re-computed
if the main clocks (Phase, and Servo) are changed.
Note
The above settings require a Save and a Reset ($$$) on the PMAC
side in order to take effect.