12.3 C: TUNING
586 SIEPYEUOQ2A01A AC Drive Q2A Technical Manual
Table 12.21 Guidelines for Carrier Frequency Parameter Setup
Symptom Remedy
Speed and torque are not stable at low speed. Decrease the carrier frequency.
Audible noise from the drive has an effect on peripheral
devices.
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 12.22 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 Swing PWM 1 (C6-02 = 7), 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 12.22 Wiring Distance
Wiring Distance Up to 50 m Up to 100 m Greater than 100 m
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:
The maximum cable length is 100 m when using A1-02 = 5 or 6 [Control Method = PM OLVector or PM AOLVector].
■ C6-03 Carrier Upper Frequency Limit
No.
(Hex.)
Name Description
Default
(Range)
C6-03
(0225)
Carrier Upper Frequency
Limit
Sets the upper limit of the carrier frequency. Set C6-02 = F [Carrier Frequency Selection = User
(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, 1 [Control Method = V/f Control, PG V/f Control], set C6-03 = C6-04 [Carrier Lower
Frequency Limit] to fix the carrier frequency.
Setting a Variable Carrier Frequency to Agree with the Output Frequency
When A1-02 = 0, 1, set C6-03, C6-04, and C6-05 [Carrier Freq Proportional Gain] as shown in Figure 12.52 to
make the carrier frequency change linearly with the output frequency.
Figure 12.52 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
■ C6-04 Carrier Lower Frequency Limit
No.
(Hex.)
Name Description
Default
(Range)
C6-04
(0226)
Carrier Lower Frequency
Limit
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.
Determined by C6-02
(1.0 - 15.0 kHz)
Set C6-03 [Carrier Upper Frequency Limit], C6-04, and C6-05 [Carrier Freq Proportional Gain] to make the
carrier frequency change linearly with the output frequency.
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