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FstatorFilt AFN13

Start Field AFN 14

AFN: Fstator Filt

13 8ms

AFN: Start Field

14 No

7 - PARAMETER DESCRIPTION

LCD Display

Range 1 to 100 ms (Default 8ms)

Description Stator Frequency Filter. This parameter lters the stator frequency applied to the motor, which can help

tune the acceleration behavior of the motor. This is particularly helpful when using short ramps and

operating the motor at a frequency above the Boost Taper Freq (AFN 08) value (eld weakening area).

Lower values allow dynamic currents to be produced, but with greater peaks. This could produce

unstable states in the eld weakening area. Low values for this parameter can cause overcurrent faults

while accelerating to frequencies over the Knee Frequency. Higher values allow the drive to run more

smoothly at frequencies over the Knee Frequency and protect the drive against overcurrent—often the case

when using special motors or spindle drives.

See also FUN02 on page 83.

Parameter Value Description

No (Default)

The shaft will begin rotating after receiving a Start command, without delay. If the application has heavy

load conditions or short ramp times, this setting can produce very large starting currents, to overcome the

inertia of the system. This may produce nuisance trips when starting.

Yes

The shaft will begin rotating after receiving a Start command, with delay, the drive is building up the

magnetic eld in the motor. This allows the drive to start in vector mode with less starting current.

z NOTE: Automatically set to “yes” when FUN 02 is set to “Vector”

Filter Slip AFN 15

AFN: Filter Slip

15 100ms

LCD Display

Range 10 to 1000 ms (Default 100ms)

Description This parameter lters the slip frequency applied to the motor, which can help improve the dynamic

response of the drive. This parameter produces the following results based on the parameter value:

If the parameter is congured to 100 ms, the drive will produce stable conditions to a change in load, in

most cases.

If the parameter is congured to less than 100 ms, the drive will be able to react quickly to a change in

load, but may over-compensate its reaction to the load.

If the parameter is congured to greater than 100 ms, the drive will react very slowly to a change in load

and will need a longer time to compensate for the difference between the setpoint and the actual frequency.

BENSHAW RSi S4 Series User Manual

Questions and Answers: