HEIDENHAIN ND 1300 CNC Setup - Manual (Page 22)

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Initial CNC setup
The CNC General screen contains fields for configuring
CNC amplifier characteristics prior to PID loop tuning.
Open loop mode
The PID and other CNC control parameters found on
CNC Setup and Joystick PID screens can be bypassed to
run the CNC motor drives in open loop configurations.
This allows finer levels of position adjustment and can
be useful during the initial setup of CNC systems. Check
the Set joystick and trackball control to open loop Mode box
to bypass CNC control loops for the joystick.
Open loop level
The amplifier open loop line logic is either active high or active low. Configure the open loop control line
to match the CNC amplifier input requirement by checking the Open loop
level is high box for positive logic, or clearing it for negative logic.
Inhibit amplifier when stopped (steppers)
A CNC move is complete only after it crosses into the target’s continuation zone. Upon crossing into the
continuation zone, the axis control system stops axis motion. Stepper motor amplifiers can be inhibited
until the next CNC move to eliminate the possibility of unwanted axis motion near the target location due
to system noise. Check the Inhibit amplifier when stopped box to
inhibit stepper drives between CNC moves.
Amplifier inhibit level
The amplifier inhibit level logic is either active high or active low. Check the Amplifier inhibit level is
high box if your amplifier requires a high logic level on the inhibit line
to prevent operation, clear this box if it requires a low logic level.
CNC Setup and PID Loop Tuning Guide