HEIDENHAIN ND 1300 CNC Setup - Manual (Page 12)

2
Setting CNC
Motor Direction
Chapter 2:
Setting Motor Direction
The QC-320 program drives CNC axis motors through external cables and amplifiers. It is often impracti-
cal to determine the resulting motor polarity and direction of rotation prior to applying motor power. How-
ever, the QC-320 program includes tools that make it simple to determine motor direction and configure
the system to accommodate it.
WARNINGS
Motors that are reversed due to wiring or amplifier configuration will run away
when driven at normal levels by the QC-320. Motor runaway can result in serious
personal injury and equipment damage. This procedure will drive the axis motors at
very low levels to determine motor direction. Follow the procedure carefully before
proceeding to other topics in this guide.
Be prepared to quickly disconnect power from the motors using the Stop button in the CNC Setup
screen or an emergency mushroom switch or other contact device provided in your system in an
emergency.
Determining motor direction
This procedure determines the rotation direction of one CNC axis motor. The images included in the
instructions show the X-axis, however all axis screens are identical and this procedure must be repeated
for all axes.
1 Confirm that power is disconnected from all axis motors and launch the QC-320 program.
2 Set units of measure to millimeters.
3 Navigate to the CNC Setup screen to enter initial values.
WARNING
The initial CNC Setup screen values severely limit axis velocity and acceleration and
provide only a small amount of loop gain. These limitations make the possibility of
motor runaway extremely unlikely. However, any possibility of motor runaway, no
matter how unlikely should be treated as a potential hazard.