Emerson FM-3 Installationshandbuch PDF herunterladen (Seite 176)

162

FM-3 Programming Module Reference Manual

actual inertia, velocity error during ramping will be reduced but not eliminated. If the Friction

parameter is greater than the actual friction, it may result in velocity error or instability. If the

Friction parameter is less than the actual friction, velocity error will be reduced by 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 table below.

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

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.

Warning

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.

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.

Operating Mode Feedforward Parameters Active

Accel FF Vel FF

Analog Velocity No Yes

Preset Velocity Yes Yes

Pulse/Position No No

Summation No Yes

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Emerson FM-3 Installationshandbuch Seite 176