Eaton SPI9000 Instrukcja Użytkownika Pobierz pdf (Strona 61)

Startup

9000X AF Drives MN04001004E—May 2011 www.eaton.com 51

V/f Curve Manual Tuning

When tuning the V/f curve manually (not using

identification run) the motor shaft must be unloaded and

the motor control mode set to frequency control (P1.6.1).

The following parameters are adjusted to tune the V/f curve:

Parameters

V/f ratio selection P1.6.3

Field weakening point P1.6.4

Voltage at field weakening point P1.6.5

V/f curve midpoint frequency P1.6.6

V/f curve midpoint voltage P1.6.7

Output voltage at zero frequency P1.6.8

When using a linear V/f curve with increased zero

frequency voltage, ensure that the motor current does

not increase too much between 3–7 Hz.

Tuning Steps

Set the motor nameplate values.

Nominal voltage of motor P1.1.6

Nominal frequency of motor P1.1.7

Nominal speed of motor P1.1.8

Nominal current of motor P1.1.9

Motor Power Factor (Cos Phi) P1.1.10

Run the motor unloaded at 2/3 rated speed using a frequency

reference. Read the motor current from the monitoring menu

(V7.4) or use 9000X drive for monitoring. This current is the

motor magnetizing current. This value should match a

nameplate magnetizing current value if given.

If the motor will only be run in closed loop, skip to section on

closed loop vector control tuning.

Change the V/f curve ratio selection to

programmable-mode = 2 (P1.6.3).

Run motor with zero frequency reference and increase motor

zero point voltage (P1.6.8) until motor current is

approximately the same as the motor magnetizing current.

(If motor is only in the low frequency area for short periods, it

is possible to use up to 80% of rated current.)

Then, set the midpoint voltage (P1.6.7) to 1.4142

*P1.6.8 ( * Zero Point Voltage) and midpoint

frequency (P1.6.6) to value P1.6.8/100%*P1.1.7.

([ZeroPoint Voltage/100%]*Nominal frequency of motor.)

P1.6.72 * P1.6.8

P1.6.8

100

----------------

* P1.1.7

P1.6.6

1 2 ... 56 57 58 59 60 61 62 63 64 65 66 ... 135 136

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