Manual

Detailed Descriptions of ACL Commands 3-57
PM [<level>] Power Level of Motors
The power level applied to the X and Y motors is altered immediately, according to the
value of <level>:
Table 15 - Power Levels of X and Y Motors
-1 Switching drivers are shut off
0 Drivers on, no current
1 Drivers on, half current (1/4 static power)
2 Drivers on, full current
This new setting lasts until the next XY motor movement occurs, at which time the motors
are set to full current for the motion and left at full current after the motion.
Caution: Be sure to shut off the switching drivers before
electrically disconnecting a motor while the
Automove power is on.
At power up the switching drivers are enabled but no current is applied to the X and Y
motors until the first front panel or ACL motion command. The IN command does not affect
the power level.
If omitted, <level> defaults to 0, meaning drivers on, no current.
If <level> is specified as 0 or -1 (i.e. there will be no current to hold the motors in place)
then the optional Step Verify circuit is deactivated. This allows the motors to be moved by
external means without triggering the Motor Slipped state. Step Verify is reactivated when
motor current is turned back on by another PM command or by any motion command.
If necessary you can keep Step Verify active while motor current is off in order to keep track
of whether the motors did move. See personality parameter 50 in Chapter 7. But use
caution -- if a motor is moved a small amount (say, 3 full steps) and then the current is
turned back on then the motor may go to a different stable position than the original one,
thus causing a slip to be detected.