220
FM-3 Programming Module Reference Manual
Note
If the friction loading of your system varies when operating at constant speed, due to a
load or spring load that changes as the motor rotates, use the lowest value measured.
3.
Repeat Step 1 using a velocity at least two times the low speed.
4.
While at speed, note the Torque Command Actual value (TCH).
5.
Use the following formula to calculate the friction:
Where:
T
CH
= Torque Command Limited value at higher speed
T
CL
= Torque Command Limited at lower speed
RPM
H
= Higher RPM (velocity)
RPM
L
= Lower RPM (velocity)
FV = Friction value
The figure below shows the relationship of Torque Command to the Velocity Feedback.
There is increased torque during the Accel ramp (Ta), constant torque (Tc) during the
constant velocity portion of the ramp and decreased torque (Td) during the decel ramp.
Figure 94:
Trapezoidal Velocity Waveform with Torque Waveform
Determining Inertia Ratio
Actual system Inertia Ratio is determined by accelerating and decelerating the load with a
known ramp while measuring the torque required.
L
H
CL
CH
RPM
-
RPM
)
T
-
(T
FV
)
100
(
=
Summary of Contents for FM-3
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Page 16: ...2 FM 3 Programming Module Reference Manual Figure 2 FM 3 Programming Module Features ...
Page 128: ...114 FM 3 Programming Module Reference Manual ...
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Page 196: ...182 FM 3 Programming Module Reference Manual ...
Page 238: ...224 FM 3 Programming Module Reference Manual ...
Page 251: ...237 Diagnostics and Troubleshooting Figure 97 Diagnostic Cable DGNE Diagram ...
Page 262: ...248 FM 3 Programming Module Reference Manual ...
Page 264: ...250 FM 3 Programming Module Reference Manual AX4 CEN CDRO ...
Page 265: ...251 Specifications Cable Diagrams ...
Page 266: ...252 FM 3 Programming Module Reference Manual SNCE XXX Cable SNCDD 001 5 Cable ...
Page 267: ...253 Specifications SNCO 003 Cable SNCI 003 Cable ...
Page 268: ...254 FM 3 Programming Module Reference Manual SNCLI 003 Cable ...
Page 272: ...258 FM 3 Programming Module Reference Manual TIA XXX Cable DDS XXX Cable ...
Page 274: ...260 FM 3 Programming Module Reference Manual CMDS XXX Cable CMMS XXX Cable ...
Page 275: ...261 Specifications CFCS XXX Cable ...
Page 276: ...262 FM 3 Programming Module Reference Manual CFCO XXX Cable ...
Page 277: ...263 Specifications CFOS XXX Cable ...
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