■ C5-37, C5-38: Motor 2 Inertia, Motor 2 Load Inertia Ratio
These parameters function for motor 2 in the same way that C5-17 and C5-18 function for motor 1.
These parameters are set automatically when Inertia Tuning and ASR Tuning are performed for motor 2 in CLV and
CLV/PM control modes. Refer to Auto-Tuning on page 109 for details on Auto-Tuning or enter the data manually.
◆ C6: Carrier Frequency
■ C6-01: Drive Duty Mode Selection
The drive has two different “duty modes” to select from based on the load characteristics. The drive rated current,
overload capacity, and maximum output frequency will change depending upon the duty mode selection. Use parameter
C6-01 to select Heavy Duty (HD) or Normal Duty (ND) for the application. The default setting is ND. Refer to Heavy
Duty and Normal Duty Ratings on page 388 for details about the rated current.
Table 5.15 Differences between Heavy and Normal Duty
Note: By changing the Duty Mode selection, the maximum size motor the drive can run changes, and the E2- parameters are
automatically set to appropriate values (E4- for motor 2). Parameters settings determined by motor capacity are recalculated
automatically when the Duty Mode selection is changed. This includes b8-04, L2-03, n5-02, L3-24, C5-17, and C5-37.
■ C6-02: Carrier Frequency Selection
Parameter C6-02 sets the switching frequency of the drive’s output transistors. Changes to the switching frequency helps
lower audible noise and also reduces leakage current.
Note: Increasing the carrier frequency above the default value automatically lowers the drive’s current rating. Refer to Rated Current
Depending on Carrier Frequency on page 179.
Note: The default setting for the carrier frequency differs based on the type of motor and the Duty Mode selection. The default is 2 kHz
when the drive is set for Heavy Duty performance, and defaulted to “Swing PWM1” when set for Normal Duty performance.
When using a PM motor, the default carrier frequency is 5.0 Hz.
No. Parameter Name Setting Range Default
C5-37 Motor 2 Inertia
0.0001 to 600.00 kgm
2
Determined by C6-01 and o2-04
C5-38 Motor 2 Load Inertia Ratio 0.0 to 6000.0 1.0
No. Parameter Name Setting Range Default
C6-01 Duty Mode Selection 0 or 1 0 (HD)
Characteristics Heavy Duty Rating (HD) Normal Duty Rating (ND)
C6-01 01
Performance
Application
Use Heavy Duty Rating for applications requiring a high overload
tolerance with constant load torque. Such applications include extruders
and conveyors.
Use Normal Duty Rating for applications in which the torque requirements
drop along with the speed. Examples include fans and pumps where a high
overload tolerance is not required.
Over load capability (oL2) 150% of drive rated Heavy Duty current for 60 s 120% of drive rated Normal Duty current for 60 s
Stall Prevention during
Acceleration (L3-02)
150% 120%
Stall Prevention during Run (L3-
06)
150% 120%
Default Carrier Frequency 2 kHz 2 kHz Swing PWM
No. Parameter Name Setting Range Default
C6-02 Carrier Frequency Selection 1 to F
Determined by A1-02, o2-04.
Reset when C6-01 is changed.
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