Hi,
I am interpretting this to mean that these settings shouldn't affect the motor torque in normal continous speed operation, but only alter the maximum torque applied to the motor when changing speeds.
That is one interpretation.....is not particularly accurate but neither is it incorrect.
If a motor has to change speed, due to a speed change command for instance, and for our purposes the it could be an increase
in speed or a decrease, then the rotor has to accelerate, ie this requires torque. If you use PA34/35 then they set the maximum
torque under ALL circumstances. If you use PA36/37 then the torque limit applies ONLY when the 'torque limit input signal'
is active.
What happens however if you are machining at a constant spindle speed but the load increases due to cutting forces.....the
servo responds by increasing torque (analogous to current) to MAINTAIN speed. Under these circumstances you'd wish that
the servo had its maximum available torque (approx. 300% of rated torque). PA34/35 effectively imasculate your servo....
not desirable.
The alternative is to use PA36/37 so that the servo is at its most capable under normal circumstances. What would be required
than is that just prior to operating the <stop> or <Estop> button that you engerise the torque limit signal. That would require
you modify Mach to include the signal operation
PRIOR to the <stop> or <Estop>. I don't know whether Mach3 can
do that but Mach4 can certainly be programmed to do that.
Craig