Controlling Servo Drives With Pulses

[Mert-G]

Hi all,

I wonder is it possible to control a servo drive(panasonic) with pulses(from an external encoder by rotating the shaft)?

I also would like to know;

1) Which type of signals do servo drives get from the host controller?

2) Do CNC's control servo drives with frequency or amplitude part of the analog signal?

[Al_The_Man]

One of the most common is ±10v analogue, torque mode drive, i.e. Transconductance amplifier, output current (torque) is proportional to voltage input.
If the drive accepts step/dir, it could be possible to drive with encoder pulses, it may require some extra logic.
Al.

[GTEN-USA]

I am 99% sure that a Panasonic servo drive will accept step and direction, You'll need to get the manual, and or software (with RS232 cable) for the drive to set it up. Please note that the encoder will give you two frequencies, 90 deg out of phase, and the default step and direction mode on the panasonic will likely be frequency and direction and not the two pules that the encoder will do.

[Al_The_Man]

and the default step and direction mode on the panasonic will likely be frequency and direction and not the two pules that the encoder will do.

The A pulse would be the step pulses, the B channel pulse may require a logic latch to hold the High or low state, which detects direction.
At the point of the A step pulse, the B will either be high or low, direction dependent.
Al.