User manual AD CM M
Page 12 of 20
HOME is a function needed to know the commutation position of the driver.
It is activated every time Phase A of the motor is energized with positive current.
This helps to home the clock of the host to the driver commutation, a function helpful to avoid step
losses when power to the driver is lost.
Note that with a stepper motor, it is important to start from where you stopped. For instance, if the
motor stopped on step 3 out of 20 per revolution, the next motion must start again from step 3. This
means that the windings have to be energized as they used to be before the motor stops or it will
loose steps. The HOME output is actually memorizing those information.
VCO input - only available on M2 and M3 version
Range = 0 to 5V corresponding to zero up to 6000Hz max.
Switching from full to half step operation or vice versa will not change the motor shaft speed.
Warning:
In case that the described input signals to the driver are generated by an open collector output
PLC, it will be necessary to add, depending on the type of output of the PLC, a pull-up or pull
down transistor.
2.3.2 Switch for operation mode
To operate the driver, it is also possible to work without using the COMMAND connector. In this case
the selection of the drive mode is done manually and directly on the board thanks to a 3-position
switch.
Their operation is as follows:
Switch Switch
Function
OPO
1-PH ON selector
F/H
Full-step, Half-step selector
DIR
Sense of rotation
Truth table for the 1-PH ON and F/H Switches
Status OPO
Status F/H
Function mode
OFF*
OFF
Full-step, two-phase ON
ON
OFF
Full-step, one-phase ON**
OFF/ON
ON
Half-step ( two-phase ON**)
* The OFF position is at the edge of the driver.
F/H
DIR
OPO
F/H
DIR
OPO
** Current correction is automatically activated, torque remains the same in all rotor positions.
2.3.3 LED busy (near COMMAND connector)
On the M2S and M3S versions the LED will be active when motor is moving or internal clock is active.
On the M1S version is will be triggered by the external clock for 10ms when f<100Hz and be
continuously ON when f>100Hz.
OFF ON
