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Operation
DK58113 Developer Kit User Manual
29
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connected the value of these settings will likely change, and if an Atlas amplifier is used, other than the motor output
mode these parameters do not need to be specified.
The following table shows the recommended (or required) settings for amplifier-related parameters:
All of the MC58113 parameters described in this section can be conveniently specified using Pro-Motion via the Axis
Wizard. See
1.12, “First-Time System Verification”
2.3.5
DK58113 Current Scale Value
To correctly control or trace motor current it is useful to know the DK58113’s amplifier-specific current conversion
factor. The following table shows this:
All of the MC58113 parameters described in this section can be conveniently specified using Pro-Motion via the Axis
Wizard. See
1.12, “First-Time System Verification”
Parameter
Value & Units
Comment
Motor Output Mode
PWM High/Low
Set the motor output mode to PWM High/Low for operation
with the on-card amplifier. For remote amplifier operation PWM
High/Low, 50/50 PWM, or sign/magnitude PWM may be selected.
SPI Atlas is selected for use with an off-card Atlas Digital
Amplifier. Pulse & Direction is selected for use with an off-card
step motor amplifier supporting those input signals.
PWM Switching Frequency
20 kHz
This setting is motor-specific. Higher inductance motors should
be set for 20 kHz. Lower inductance motors may use 40 or 80
kHz to reduce current ripple and minimize heat generation.
PWM Dead Time
540 nSec
For correct operation of the DK58113’s on-card switching
amplifier this parameter must be set to this value.
PWM Refresh Time
2,000 nSec
To ensure sufficient time to recharge the on-card amplifier’s high
side switches this parameter must be set to this value.
PWM Refresh Period
8 cycles
To ensure sufficient time to recharge the on-card amplifier’s high
side switches this parameter must be set to this value
PWM Signal Sense
Active High
For correct operation of the on-card amplifier all PWM outputs
must be set to active high.
Minimum Current Read Time 2,000 nSec
To ensure sufficient minimum current read time with BLDC
motors this parameter must be set to this value.
PWM High/Low motor output mode must be selected to use the DK58113’s on-card amplifier. If any other motor
output mode is selected the on-card amplifier must be disabled by installing JP1 and JP2 in the 2-3 position. See
Parameter Value & Units
Comments
Leg Current
Conversion
.733 mA/count
This value should be entered so that the motor
current can be traced and displayed correctly in
amps.
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