OPTIMUM
M A S C H I N E N - G E R M A N Y
Description of the connection
29 / 11 / 2006
Page
11
Description of the connection CNC Controller III and VI ; Version 2.0.1
©
2006
GB
7.2.2
Operating current and holding current
The control board disposes of two adjustable fields.
Operating current
The operating current moves the step motor. With a direction signal the turning direction is being
changed. The operating current can be set from 2 to 6 A. The type plate of the corresponding
step motor gives the values of the required settings.
Settings operating current:
The current is increasing when the potentiometer is turned clockwise. The current needs to be
set according to the used step motor. If the current is set too high, the running properties will
degrade and there will not be more power ! Please do not overturn the potentiometer.
Setting step motor 2,2 Nm about 75%
Setting step motor 4,2 Nm about 100%
Setting step motor 8 Nm about 100%
When the red control lamp (red LED) is flashing, the operating current
is set too high and needs to be reduced. Also refer to,
“The red LED on the CNC controller flashes or flickers.“ on page
Holding current
The holding current provides a save hold during the operation break and a save hold of the non-
moving axes at the time of operation.
Setting holding current:
The holding current is increasing by turning the potentiometer clockwise. In most cases a setting
of about 30% is sufficient. In case of heavy chipping and when a ball screw spindle is being
used, the setting needs to be set a little higher at about 40%.
CAUTION!
If the holding current is set too high, it will lead to unnecessary heating-up !
Fig.7-6: Potentiometer control board V2
0 %
33 %
66%
100%
Potentiometer holding current
Potentiometer operating current
