YASKAWA P1000 Quick Start Manual page 100

4.6 Basic Drive Setup Adjustments
C6-02: Carrier Frequency Selection
n
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.
No. Parameter Name
C6-02 Carrier Frequency Selection
Settings:
C6-02 Carrier Frequency
1 2.0 kHz
2 5.0 kHz
3 8.0 kHz
4 10.0 kHz
Note: Swing PWM uses a carrier frequency of 2.0 kHz as a base, then applies a special PWM pattern to reduce the audible noise.
Guidelines for Carrier Frequency Parameter Setup
Speed and torque are unstable at low speeds
Noise from the drive affects peripheral devices
Excessive leakage current from the drive
Wiring between the drive and motor is too long
Audible motor noise is too loud
<1> The carrier frequency may need to be lowered if the motor cable is too long. Refer to
<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.
Wiring Distance
Recommended setting value for C6-02
d1-01 to d1-17: Frequency Reference 1 to 16 and Jog Frequency Reference
n
The drive lets the user switch between up to 17 preset frequency references during run (including the Jog reference) through
the digital input terminals. The drive uses the acceleration and deceleration times that have been selected when switching
between each frequency reference.
The Jog frequency overrides all other frequency references and must be selected by a separate digital input.
The multi-speed references 1, 2, and 3 can be provided by analog inputs.
100
Accel Time 1
(C1-01)
Output
frequency
FWD (REV)
Run command
Accel/Decel Time Selection 1
(Terminals S1 to S8, H1- oo = "7")
Figure 4.16 Timing Diagram of Accel/Decel Time Change
C6-02
5
6
7
8
Symptom
<1>
Table 4.12 Wiring Distance and Carrier Frequency
Up to 50 m
1 to F (up to 15 kHz)
Decel Time 1
Decel Time 2
(C1-02)
(C1-04)
Accel Time 2
(C1-03)
Decel Time 1
(C1-02)
Time
ON OFF ON
ON
OFF
Setting Range
1 to F
Carrier Frequency
12.5 kHz
15.0 kHz
Swing PWM 1
Swing PWM 2
Lower the carrier frequency.
Increase the carrier frequency or use Swing PWM.
Table 4.12.
Up to 100 m
1 to 2 (up to 5 kHz),
7 (Swing PWM)
YASKAWA ELECTRIC TOEP YAIP1U 01B YASKAWA AC Drive - P1000 Quick Start Guide
Default
7
C6-02 Carrier Frequency
9 Swing PWM 3
A Swing PWM 4
F User defined (C6-03 to C6-05)
Remedy
<2>
Greater than 100 m
1 (up to 2 kHz), 7 (Swing PWM)