Applied Motion RS-232 - Manual (Page 154)

154 920-0002 Rev. I
2/2013
Host Command Reference
PI - Power-up Idle Current
Compatibility: Stepper drives only
Affects:
Motor current at standstill, holding torque
See also: CC, CD, CI commands
Idle current is the level of current supplied to each motor phase when the motor is not moving. Using an idle
current level lower than the running motor current (see CC and PC commands) aids in motor cooling. A common
level used for the idle current setting is 50% of the running current. After a motor move, there is a time delay
after the motor takes its last step before the reduction to the idle current takes place. This delay is set by the CD
command.
This command is similar to the CI command. It differs only in that in addition to setting the idle current of the drive,
PI also immediately saves the setting to NV memory. See CI command page for details.
Command Details:
Structure PI{Parameter #1}
Type BUFFERED
Usage READ/WRITE
Non-Volatile Yes (see note below)
Register Access “O” (031)
Note: The CI command uses different units than the “O”
register; see Data Registers section for more details
Parameter Details:
STAC6
Parameter #1 Idle current at power-up
- units amps
- range 0 - 100% of running current
ST-Q/Si, ST-S, STM, STAC5
Parameter #1 Idle current at power-up
- units amps
- range 0 - 90% of running current
NOTE: This data is saved to non-volatile memory immediately upon execution. It is not required to execute the
SA command to save to non-volatile memory.
Examples:
Command Drive sends Notes
PI0.75 - Set power-up idle current to 0.75 amps
PI PI=0.75