Yaskawa F7 Drive Programming Manual Manual do Utilizador descarregar pdf (Página 131)

Programming 123

The following figure demonstrates acceleration when L3-05≠0.

Fig. 88 Time Chart for Stall Prevention Level During Running

The L3-06 parameter is set as a percentage of the Drive rated output current. If the Drive still faults when L3-05≠0, then either

lower the L3-06 or adjust the C1-02 or C1-04 settings for a quicker deceleration.

 L3-11 OV Suppression Function Selection

 L3-12 OV Suppression Function Voltage Level

Setting Range: 350 to 390 Vdc (240V Class), 700 to 780 Vdc (480V Class)

Factory Default: 380Vdc (240 V Class), 760Vdc (480V Class)

This function suppresses a rise in the DC bus voltage caused by applications that have a cyclic regenerative load. This is

accomplished by lowering the regenerative torque limit in response to a rise in the DC bus voltage level. Parameter L3-11

enables or disables OV suppression function. When the DC bus voltage is less than the L3-12 minus 30Vdc level, the

regenerative torque limit value remains as set. If the DC bus voltage equals the L3-12 minus 30Vdc level, the regenerative torque

limit value is cut in half. If the DC bus voltage exceeds the L3-12 level, the regenerative torque limit is set to zero. Between the

L3-12 minus 30Vdc and L3-12 levels, the regenerative torque limit value is reduced in proportion to the DC bus voltage.

The OV suppression function is enabled only for open loop vector and flux vector (A1-02 = 2 or 3). This function should be

disabled for applications requiring precise speed regulation or precise stopping times as the motor speed could change based on

the reduced torque limit. Use a dynamic braking transistor/resistor instead to dissipate the regenerative energy. This function

works best when the motor operates in its constant torque area.

Setting Description

0 Disabled (factory default)

1 Enabled

L3-06

Output

Fre

uenc

Output

Current

- Decel time

C1-02 or C1-04.

– Active accel time

a - Decel time

C1-02 or C1-04

b - Active Accel time

TIME

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Yaskawa F7 Drive Programming Manual Manual do Utilizador Página 131