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FM-3 Programming Module Reference Manual
Because of internal math in the FM-3/4, some user unit combinations may cause module or
drive trajectory faults. The maximum motor velocity allowed by the drive is detailed under
the distance section of the User Units View and is labeled “User Unit Limited Speed”. When
the user unit setup is altered in such a way that the maximum motor speed allowed by the
drive is less than the maximum speed allowed by the chosen motor, the readout of maximum
motor speed allowed by the drive changes to have a red background. If a configuration is
downloaded to the FM-3/4 with a red background on the “User Unit Limited Speed”, the drive
will obtain a trajectory fault at speeds near this velocity. To alleviate this issue, simply remove
decimal places from your user units, and/or change the characteristic distance (numerator) of
your scaling parameters to be a smaller number than it was. The red background indicating
module trajectory faults will go away when the user unit setup is scaled for a realistic
accuracy based on the encoder counts per revolution.
Master Units View
Use this view if you wish to set parameters for synchronized motion.
Position View
The Settings group on this view sets the Define Home Position.
Figure 75: Position View
To setup following error limit and software travel limits, fill out the following parameters in
the Limits Group: