Eaton SPI9000 Instrukcja Użytkownika Pobierz pdf (Strona 65)

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Closed Loop Vector Control Manual Tuning (SPX9000 Only)

For some non-standard motors, the auto-tune is not

sufficient. Closed loop control mode is used when enhanced

performance near zero speed and better steady starts and

dynamic speed accuracy at higher speeds are needed.

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

Check encoder pulse/revolution rate and set this value to

expander menu P6.3.1.1. Parameter is only visible if OPTA4

or OPTA5 is installed to slot C.

Set motor control mode to open loop frequency control

(P1.6.1 = 0).

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

reference. Read the motor current from the monitoring menu

(V1.4) or use 9000X drive for monitoring. This current is the

motor magnetizing current. This value should match a

nameplate magnetizing current value if given.

Set the motor magnetizing current P1.6.17.1.

Check the expander board menu (monitoring page V6.3.2.1),

to be sure that the encoder frequency is approximately the

same as the output frequency, and that the direction is

correct. If the encoder frequency direction is opposite the

output frequency (negative value), change the motor phase

order to encoder connection. The expander board menu also

has a parameter to invert the signal if rewiring is not an

option.

Set motor control mode to closed loop (P1.6.1 = 3 or 4).

Fine Tuning

Tune parameter P1.6.17.6 (slip adjust) to get the motor

voltage slightly above the linear V/f curve when motor is

loaded and slightly below when motor is generating.

Using the linear V/f curve (P1.6.3 = 0), run the motor in

frequency control mode (P1.6.1 = 0) at about 2/3 of the

motor nominal frequency and check motor voltage (V7.7).

At 40 Hz, voltage should be 40/60*460V = 307V.

Run the motor in closed loop control mode with same

reference and check the motor voltage. Adjust P1.6.17.6

(slip adjust) so that motor voltage is slightly above the linear

V/f curve. If motor voltage is low, decrease the value of slip

adjust (P1.6.17.6).

Closed Loop Motor Voltage

40 Hz

60 Hz

460V

307

Closed Loop

Motor Voltage

1 2 ... 60 61 62 63 64 65 66 67 68 69 70 ... 135 136

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