2.4 C: Tuning
222 YASKAWA TOEPYAIGA5002A GA500 DRIVE PROGRAMMING
A : Swing PWM4 (Audible Sound 4)
B : Leakage Current Rejection PWM
Set this when the wiring distance between the drive and motor is long and there is a fault in the current monitor or the
drive detects and alarm because of the effect of a leakage current.
The carrier frequency is equivalent to 2.0 kHz.
F : User Defined (C6-03 to C6-05)
Use C6-03 to C6-05 to set detailed setting values.
Note:
• The setting range changes when the A1-02 [Control Method Selection] value changes:
–5, 8 [OLV/PM, EZOLV]: You can set C6-02 = 1 to 6, B, and F.
–6 [AOLV/PM]: You can set C6-02 = 1 to 6.
• The carrier frequency for Swing PWM 1 is equivalent to 2.0 kHz. Swing PWM applies a special PWM pattern to decrease the audible
noise.
Table 2.33 Guidelines for Carrier Frequency Parameter Setup
Symptom Remedy
Speed and torque are not stable at low speed. Decrease the carrier frequency.
Speed and torque are not stable at low speed. Decrease the carrier frequency.
Too much leakage current from the drive. Decrease the carrier frequency.
Wiring between the drive and motor is too long. Decrease the carrier frequency.
Note:
If the motor cable is too long, it can be necessary to decrease the carrier frequency. Refer to Table 2.34 for the wiring
distance and decrease the carrier frequency.
Audible motor noise is too loud.
Increase the carrier frequency. Use Swing PWM.
Note:
The default carrier frequency in ND is C6-02 = 7 [Swing PWM1 (Audible Sound 1)], with a 2 kHz base. You can
increase the carrier frequency in Normal Duty mode, but this will decrease the drive rated current.
Table 2.34 Wiring Distance
Wiring Distance 50 m (164 ft) Maximum 100 m (328 ft) Maximum More than 100 m (328 ft)
C6-02 [Carrier Frequency Selection] 1 to F (up to 15 kHz) 1 to 2 (up to 5 kHz), 7 1 (up to 2 kHz), 7
Note:
• If the length of the wire between the drive and an induction motor is longer than 100 m (328 ft), set A1-02 = 0 [V/f].
• The maximum wiring cable length between the drive and a PM motor is 100 m (328 ft).
• If the cable length between the drive and the motor is too long when A1-02 = 6, set A1-02 = 5.
■ C6-03: Carrier Frequency Upper Limit
No.
(Hex.)
Name Description
Default
(Range)
C6-03
(0225)
Carrier Frequency Upper
Limit
Sets the upper limit of the carrier frequency. Set C6-02 = F [Carrier Frequency Selection = User
Defined (C6-03 to C6-05)] to set this parameter.
Determined by C6-02
(1.0 - 15.0 kHz)
Setting a Fixed User-Defined Carrier Frequency
When you cannot use C6-02 to set a carrier frequency between set selectable values, you can set the value in C6-03.
The carrier frequency will be fixed to the value set to C6-03.
When A1-02 = 0 [Control Method Selection = V/f], set C6-03 = C6-04 [Carrier Frequency Lower Limit] to fix the
carrier frequency.
Setting a Variable Carrier Frequency to Agree with the Output Frequency
When A1-02 = 0, set C6-03, C6-04, and C6-05 [Carrier Freq Proportional Gain] as shown in Figure 2.40 to make
the carrier frequency change linearly with the output frequency.
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