The velocity of an axis is the rate of change of position: dx/dt
The acceleration of an axis is the rate of change of velocity: dv/dt
The jerk of an axis is the rate of change of acceleration: da/dt
AT ENTER NEXT COMMAND enter diagnostics with the DI command. Then use the AC command, this will show the current max velocities set for each axis and the machine travel (parameters IPM and TRAVEL).
On the SETP page these can be changed:
Important note for the parameter 3 PHASE > 5% LOW. Make sure the VOLT 5% LOW parameter is set to NO , if the AC voltage is not low. (when it is YES it will run at 75% rapid). This is a legacy parameter that makes a blanket change in the max IPM. It is better to derate the IPM or DPM using the CUSTOM IPM described below.
The "3 PHASE > 5%" will lower the max rapid IPM that is set above. When this parameter is set to YES, the RAPID will NOT be what it is set to above. 5% LOW set to YES will derate the max IPM to 75% of what the max IPM is set to. So, 400 IPM will now be 300 IPM
Velocity:
IPM - SELECT THE MAX RAPID FEED RATE: Choose the preset IPM values, or choose 8) CUSTOM IPM. Using CUSTOM IPM the IPM can be set separately for each axis. Like make X and Y 500 IPM and Z 450 IPM.
With CUSTOM the rotary rotation speed is also available to be set. To set a rotary max speed of 23 RPM would be 8280 DPM.
Acceleration:
Acceleration can make a rapid look slow. Acceleration on each axis is controlled by the RAMP parameters. The default ramp is different for each TRAVEL size set for the machine.
X RAMP, Y RAMP, Z RAMP, A RAMP, B RAMP are the acceleration values. The base number is 100%. Larger number will decrease the acceleration (sluggish). Smaller number will increase acceleration (snappier).
The RAMP value is not a specific unit, because as the machine TRAVEL size is changed, the values affect will change.
The larger the machine, then this default ramp value of 100 will become longer, slower max IPM. For example, a VMC2216 will have a much shorter/faster ramp to 400IPM than a VMC8030 would that is also set to 400IPM. But both machines will go 400IPM max, but the 8030 will accelerate slower to get to that final 400 IPM speed.
The ramp length, or acceleration, will affect how long it takes an axis to get to 100% rapid speed.. To reduce the default ramp to max IPM, change the X RAMP, Y RAMP and Z RAMP to a smaller default. The X RAMP 100 is the default setting for the machine TRAVEL size. To make the ramp to max IPM speed shorter/faster then reduce this number. Setting the value to 50 will make the ramp length half of the default. This effectively doubles the default acceleration currently set. So, for that axis to go from 0 to 400 IPM a RAMP of 50 will take half the time it would at 100.
Jerk:
JERK a value of 5 to 10 is good staring place. The number is how many milliseconds to get to full acceleration.