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Functions (continued)

Altivar

variable speed drives

current limit

A 2

currentlimitcanbeconguredbetween0.25and1.5timesthenominaldrive

current and can be used to limit the torque and the rise in motor temperature.

Switching between the two current limits is enabled via a logic input or via the

Modbus serial link.

Automatic DC injection

ThisfunctionenablesstandstillDCinjection,whichcanbesetbetween0and

1.2timesthevalueofthenominaldrivecurrent(factory-setconguration:

0.7 x motor nominal current), as soon as operation is no longer controlled and

the motor speed is zero:

v Either for a period of time, which can be set between 0.1 and 30 s

v Or continuously

Factory-setconguration:FunctionactivewithDCinjectionfor0.5s.

In3-wirecontrol,DCinjectionisonlyactiveiflogicoutputLI1isactive

(assigned to stop).

Motor control proles

Threemotorcontrolprolesareavailabledependingontheapplication

requirements:

v Standard (U/F):Simplemotorcontrolprolemaintainingaconstantvoltage/

frequency ratio with an optional low speed setting.

Prolesuitableforsmallconveyors,applicationswithmotorsconnectedin

parallel, etc.

v Performance (sensorless ux vector control):Prolewhichcanguaranteethe

levelofperformancewithamotorwiththesamepoweroroneratingless.Thisprole

canbeusedtoobtainimproveddynamicspecicationsatlowspeed.

Prolesuitableforrunningmachines,etc.

v Pump/Fan (Kn²): Quadratic ratio for obtaining a torque proportional to the square

ofthespeed.Thisprolecanbeusedtooptimizeenergyconsumptionaccordingto

the load applied to the machine.

Prolesuitableforpumpregulation,airextraction,etc.

Switching frequency, noise reduction

The switching frequency setting between 2 and 16 kHz permits a reduction in the

noise generated by the motor for any application requiring a low level of noise.

The switching frequency can be modulated randomly in order to avoid resonance.

This function can be disabled if it causes instability.

Switching the DC voltage at high frequency is useful for supplying the motor with a

current wave having little harmonic distortion.

This type of operation increases drive overheating.

Factory-setconguration:Lowfrequencysetat4kHz.

Frequency jump

Used to pass a mechanical resonance point likely to cause increased noise or risk of

mechanical breakdown.

Thefrequencyjumpisxed.Itiswithin±1Hzoftheconguredresonancepoint.

Jog mode

Thiscanbeusedforpulseoperationwithminimumramptimes(0.1s),axedspeed

reference set at 5 Hz and minimum time of 0.5 s between 2 pulses.

Enabled by 1 logic input and pulses issued by the operating direction command.

This function is suitable for machines with product insertion in manual mode (for

example, gradual movement of the mechanism during maintenance operations).

Introduction:

page 8

Specications:

page 10

References:

page 14

Dimensions:

page 18

Connections:

page 22

Setting the “DC injection” function with the SoMove

setup software

Energy saving with the

Pump/Fan prole (Kn

)

Frequency jump in relation to the resonance point

2 Hz

± 1 Hz

Reference

f (Hz)

Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com

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