YASKAWA CIPR-GA50C series Technical Manual page 538

12.4 C: Tuning
Symptom
Speed and torque are not stable at low speed.
Speed and torque are not stable at low speed.
Too much leakage current from the drive.
Wiring between the drive and motor is too long.
Audible motor noise is too loud.
Wiring Distance
C6-02 [Carrier Frequency Selection]
Note:
• When the wiring length 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.
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C6-03: Carrier Frequency Upper Limit
No.
Name
(Hex.)
C6-03 Carrier Frequency Upper
Limit
(0225)
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
make the carrier frequency change linearly with the output frequency.
Figure 12.47 Setting a Variable Carrier Frequency to Agree with the Output Frequency
Note:
• When C6-05 ≤ 7, the drive disables C6-04. The carrier frequency is fixed to the value set to C6-03.
• The drive detects oPE11 [Carrier Frequency Setting Error] when these conditions are correct at the same time:
–C6-05 ≥ 6
–C6-04 ≥ C6-03
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C6-04: Carrier Frequency Lower Limit
No.
Name
(Hex.)
C6-04 Carrier Frequency Lower
Limit
(0226)
538
Table 12.41 Guidelines for Carrier Frequency Parameter Setup
Decrease the carrier frequency.
Decrease the carrier frequency.
Decrease the carrier frequency.
Decrease the carrier frequency.
Note:
If the motor cable is too long, it can be necessary to decrease the carrier frequency. Refer to
wiring distance and decrease the carrier frequency.
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 also decrease the drive rated current.
Table 12.42 Wiring Distance
50 mm (164 ft) Maximum
1 to F (up to 15 kHz)
V/f OLV OLV/PM OLV/PM AOLV/PM EZOLV
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.
V/f OLV OLV/PM AOLV/PM EZOLV OLV/PM
Sets the lower limit of the carrier frequency. Set C6-02 = F [Carrier Frequency Selection = User
Defined (C6-03 to C6-05)] to set this parameter.
Remedy
100 m (328 ft) Maximum
1 to 2 (up to 5 kHz), 7
Description
Description
YASKAWA SIEPC71061753A GA500 Technical Manual
Table 12.42 for the
More than 100 m (328 ft)
1 (up to 2 kHz), 7
Default
(Range)
Determined by C6-02
(1.0 - 15.0 kHz)
Figure 12.47 to
Default
(Range)
Determined by C6-02
(1.0 - 15.0 kHz)