Howard,
There is another way...
the Sanyo amp and the 5i20/7i33 can work together with analog velocity
mode.
Emc would work with the 5i20 to create a PWM signal
The 5i20 would send this to the 7i33 which would convert PWM to Analog
The analog signal would go to the Sanyo amplifier
This input is not a pulse at all, it is often a ramp
like this
V ^ __________ V ^
e | / \_____ o |
l | ___/ \__________ l |
o | t
c -----> time a
i g
t e
y
the speed is proportional to the command voltage
the direction depends on the sign of the command voltage
like this
__________ ^
/ \ | positive direction
no motion ___/............\...0volts |
\ |
-----> time \________ | negative direction
v
The amplifier would move the motor
The Encoder would return to the amplifier and on to EMC.
EMC would close the position loop.
I think this is the most common form of cnc control.
It is not the newest, but is very common.
regards
TomP
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