C6-05: carrier frequency proportional gain – Yaskawa AC Drive P1000 Bypass Technical Manual User Manual

Page 105

Guidelines for Carrier Frequency Parameter Setup

Symptom

Remedy

Speed and torque are unstable at low speeds

Lower the carrier frequency.

Noise from the drive affects peripheral devices
Excessive leakage current from the drive
Wiring between the drive and motor is too long

<1>

Audible motor noise is too loud

Increase the carrier frequency or use Swing PWM.

<2>

<1> The carrier frequency may need to be lowered if the motor cable is too long. Refer to

Table 5.7

<2> The default carrier frequency is Swing PWM (C6-02 = 7), using a 2 kHz base. Increasing the carrier frequency is permissible , however the drive

rated current is reduced when the carrier frequency is increased.

Table 5.7 Wiring Distance and Carrier Frequency

Wiring Distance

Up to 50 m

Up to 100 m

Greater than 100 m

Recommended setting value for C6-02

1 to F (up to 15 kHz)

1 to 2 (up to 5 kHz),

7 (Swing PWM)

1 (up to 2 kHz), 7 (Swing PWM)

C6-05: Carrier Frequency Proportional Gain

Sets a user-defined or a variable carrier frequency. Set C6-02 to F to set the upper and lower limits and the carrier frequency

proportional gain.

No.

Parameter Name

Setting Range

Default

C6-05

Carrier Frequency Proportional Gain (V/f Control only)

0 to 99

Determined by

C6-02

Setting a Fixed User-Defined Carrier Frequency

A carrier frequency between the fixed selectable values can be entered in parameter C6-03

<1>

when C6-02 is set to F.

In V/f Control, adjust parameter C6-04

<1>

to the same value as C6-03

<1>

Setting a Variable Carrier Frequency (V/f Control)

In V/f Control, the carrier frequency can be set up to change linearly with the output frequency by setting the upper and lower

limits for the carrier frequency and the carrier frequency proportional gain (C6-03

<1>

, C6-04

<1>

, C6-05) as shown in

Figure

5.17

C6-03

C6-04

E1-04

x C6-05

Output Frequency

Output

Frequency

Max Output Frequency

Carrier Frequency

Figure 5.17 Carrier Frequency Changes Relative to Output Frequency

Note:

When C6-05 is set lower than 7, C6-04

<1>

is disabled and the carrier frequency will be fixed to the value set in C6-03

<1>

<1> Details on this function can be found in the standard P1000 Technical Manual (SIEPCYAIP1U01) at www.yaskawa.com.

5.3 C: Tuning

YASKAWA SIEP YAIP1B 01A YASKAWA AC Drive – P1000 Bypass Technical Manual

105

Programming