Schneider Electric 58 TRX

Altivar® 58 TRX AC Drives

Drive and Motor Configuration Parameters

46 09/2003

Acceleration and Deceleration Ramp Profile

The ramp profile for acceleration and deceleration is the gr adual c hange of the output freque ncy from a

speed reference following a linear or predetermined ratio that enab les th e ramps to be giv en an S- or U-

shaped profile. For the ATV58 TRX controller , the select ion of a r amp profile (linear , S , or U) a ffect s both

the acceleration and deceleration ramps.

An S-shaped ramp profile takes up mechanical play, eliminates jolts, and limits “non-following” of s peed

during rapid transient operation of high-inertia machines. They are particularly suited to applications

involving materials handling, packaging, and personnel transportation.

U-shaped ramp profiles are ideal for pumping applications (installatio ns with centrifugal pumps and non-

return valves) because they improve control over valve operation.

The table below provides graphical representations of these two ramp profiles.

Torqu e Limit

A torque limit can be implemented in three ways on constant torque rated products:

• With the Torque Limit parameter. This parameter is factory set at 200% and can be ad justed from 0

to 200% of the drive controller’s constant torque rating.

• With a logic input and an associated torque limit (see Torque Limit by Logic Input).

• With an Analog Input (see Torque Limit by Analog Input).

Current Limit

This parameter can be used to limit the maximum motor current. This parameter is f actory set at 136%,

and can be adjusted from 25% to 136% of the drive controller’s constant-torque output current rating.

Switching Frequency

This function allows configuration of the drive output tr ansistors’ s witching frequen cies. Ref er to the driv e

controller rating table for continuous current ratings and associate d switching frequ ency . The table belo w

shows the available switching frequencies by type (parameter SFt) for each ATV58 TRX model.

ATV5 8 TRX drive controllers have an automatic f eature that is used if the driv e controller is intermittently

used at the high end of its temperature rating and HF1 or HF2 switc hing frequenc y type is prog rammed.

In this configuration, if the drive controller thermal state goe s abo ve 95%, the s witching frequency d rops

into the LF: Low Freq. type range of 2 or 4 kHz depending on the drive controller rating (see the table

above). When the thermal state cools to 70%, the switching frequency returns to the set value.

S-Shaped Ramp Profile U-Shaped Ramp Profile

The curve coefficient is fixed, with t2 = t1 x 0.6 (t1 is the set ramp time). The curve coefficient is fixed, with t2 = t1 x 0.5 (t1 is the set ramp time)

Configurable Switching Frequencies

ATV58 TRX Models LF Type (kHz) HF1, HF2 Type (kHz)

ATV58•U09M2 to ATV58•D12M2

ATV58•U18N4 to ATV58•D23N4 0.5, 1, 2, 4 8, 12, 16

ATV58HD16M2X and ATV58HD23M2X

ATV58HD28N4 to ATV58HD46N4 0.5, 1, 2, 4 8, 12

ATV58HD28M2X to ATV58HD46M2X

ATV58HD54N4 to ATV58HD79N4 0.5, 1, 2, 4 8

ATV58HC10N4X to ATV58HC33N4X 0.5, 1, 2 4

S_Ramp.eps

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