Emerson FM-3 manual Determining Tuning Parameter Values, Line Voltage EN Only

FM-3 Programming Module Reference Manual

Friction parameter is less than the actual friction, velocity error will be reduced but not eliminated.

Feedforwards can be enabled in any operating mode, however, there are certain modes in which they do not function. These modes are described in the table below.

Operating Mode	Feedforward Parameters Active
	Accel FF	Vel FF
Analog Velocity	No	Yes
Preset Velocity	Yes	Yes
Pulse/Position	No	No
Summation	No	Yes

Low Pass Filter Group

The Low Pass Filter will reduce machine resonance due to mechanical coupling and other flexible drive/load components by filtering the command generated by the velocity loop. A check box on the Tuning tab enables a low pass filter applied to the output of the velocity command before the torque compensator. The low pass filter frequency parameter defines the low pass filter cut-off frequency. Signals exceeding this frequency will be filtered at a rate of 40 dB per decade. The default value is 600Hz.

Line Voltage (EN Only)

Line Voltage specifies the applied power and adjusts the internal gains to compensate for it. This parameter has two choices 115 VAC and 230 VAC. If the Line Voltage is set to 230 VAC when the actual applied voltage is 115 VAC, the motor will be slightly less responsive to commands and load disturbances.

The Line Voltage must never be set to 115 VAC if the applied voltage is actually 230 VAC. This can cause drive instability and failure, resulting in property damage.

Determining Tuning Parameter Values

For optimum performance you will need to enter the actual system parameters into the drive. This section discusses the methods which will most accurately determine those parameters.

Note

If you have an application which exerts a constant unidirectional loading throughout the travel such as in a vertical axis, the inertia tests must be performed in both directions to cancel out the unidirectional loading effect.

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