Rockwell-automation SA3100 Distributed Power System Drv Config,Program Instrukcja Użytkownika Pobierz pdf (Strona 125)

SA3100 Local Tunable Variables

C-3

Tuning STATOR_IZ_E1% for Constant Power Applications

The SA3100 Constant Power operating system has the capability of

accommodating temperature changes via modification of the slip value. This

modification of the slip value is accomplished through the use of a PMI reference

magnetizing current table, which enables the PMI to determine when a load change

has occurred.

When a load change occurs, the output of the flux loop will increase. This increased

output is compared to the value from the reference table. The difference between

the two generates a change in slip. The change in slip causes a reduction in flux

loop output which, in turn, causes the flux loop output to be the correct value for the

magnetizing current value at that point in the speed range.

In order to tune or calibrate the table, a speed loop is implemented in the UDC

module. This speed loop must be set up so that a value of 4095 counts of speed

reference corresponds to the maximum speed of the drive (i.e. four times the

maximum voltage speed). The following table indicates the speed reference points

at which data is to be obtained: Note that the values saved in the IGNn! variables

will be in units of amps

∗

100.

Ref. Point

Speed Reference

Counts

Where the Value is

Saved

One 409 STATOR_IZ_E1%

Two

1023

1. Equal to maximum voltage speed.

The number of reference points required depends upon the

speed range of the application:

For a 2 to 1 range, reference points 1 to 7 are used.

For a 3 to 1 range, reference points 1 to 9 are used.

For a 4 to 1 range, reference points 1 to 10 are used.

IGN1!

Three 1125 IGN2!

Four 1227 IGN3!

Five 1329 IGN4!

Six 1635 IGN5!

Seven 1941 IGN6!

Eight 2247 IGN7!

Nine 2859 IGN8!

Ten 4095 IGN9!

STATOR_IZ_E1% No Load Stator Current

1 2 ... 120 121 122 123 124 125 126 127 128 129 130 ... 161 162

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Rockwell-automation SA3100 Distributed Power System Drv Config,Program Instrukcja Użytkownika Strona 125

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