YASKAWA Z1000U Series, Programming Manual

Page: 49 / 323

u
C6: Carrier Frequency
n C6-02: Carrier Frequency Selection
Sets the switching frequency of the drive output transistors. Changes to the switching frequency lower audible noise and reduce
leakage current.
Note: Increasing the carrier frequency above the default value automatically lowers the drive current rating. Refer to Rated Current Depending
on Carrier Frequency on page 50 .
No. Parameter Name Setting Range Default
C6-02 Carrier Frequency Selection 1 to 4, F Determined by A1-02 and o2-04.
Setting 1: 4.0 kHz
Setting 2: 6.0 kHz
Setting 3: 8.0 kHz
Setting 4: 10.0 kHz
Setting F: User defined (C6-03 to C6-05)
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.
<1> The carrier frequency may need to be lowered if the motor cable is too long. Refer to Table 1.14 .
Table 1.14 Wiring Distance and Carrier Frequency
Wiring Distance Up to 50 m Greater than 50 m
Recommended setting value for C6-02 1 to 4 (up to 10 kHz) 1 (up to 4 kHz)
Note: The maximum cable length is 100 m when using OLV/PM (A1-02 = 5).
n C6-03, C6-04, C6-05: Carrier Frequency Upper Limit, Lower Limit, Proportional Gain
Note: C6-04 and C6-05 are available in V/f Control mode only.
These parameters set 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
C6-03 Carrier Frequency Upper Limit
4.0 to 10.0 kHz
<1>
Determined by
C6-02 and o2-04
C6-04 Carrier Frequency Lower Limit (V/f Control only)
4.0 to 10.0 kHz
<1>
C6-05 Carrier Frequency Proportional Gain (V/f Control only)
0 to 99
<1>
<1> Available only when C6-02 is set to F.
The upper limit of the carrier frequency varies by the drive model. Refer to Rated Current Depending on Carrier
Frequency on page 50 for details.
Setting a Fixed User-Defined Carrier Frequency
A carrier frequency between the fixed selectable values can be entered in parameter C6-03 when C6-02 is set to F.
In V/f Control, adjust parameter C6-04 to the same value as C6-03.
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, C6-04, C6-05) as shown in Figure 1.22 .
1.3 C: Tuning
YASKAWA ELECTRIC SIEP C710636 10C Z1000U HVAC MATRIX Drive Programming Manual 49
1
Parameter Details