541
5. PARAMETERS
5.13 (G) Control parameters
3
4
5
5
5
6
7
8
9
10
5.13.3 Load pattern selection
Optimal output characteristics (V/F characteristics) for application or load characteristics can be selected.
*1 When the setting value is selected under V/F control, the operation is the same as the one for constant-torque load (Pr.14 = "0").
Application for constant-torque load (Pr.14 = "0")
• The output voltage will change linearly against the output frequency at the base frequency or lower.
• Set this parameter when driving a load that has constant load torque even when the rotation speed is changed, such as
conveyor, dolly, or roll drive.
Select for constant-torque load (setting value "0") even for fan and pump in following cases.
• When accelerating a blower with large moment of inertia (J) in a short period of time.
• When it is a constant-torque load such as rotary pump or gear pump.
• When the load torque increases in low speed such as screw pump.
Application for variable-torque load (Pr.14 = "1", initial value)
• The output voltage will change in square curve against the output frequency at the base frequency or lower. (1.75th-power
curve for FR-F860-00680 or higher)
• Set this parameter when driving a load with load torque change proportionally against the square of the rotation speed,
such as fan and pump.
NOTE
• Pr.14 will become enabled at the time of V/F control.
Pr.0 Torque boost page 538
Pr.3 Base frequency page 539
Pr.178 to Pr.182 (Input terminal function selection) page 343
Pr. Name Initial value Setting range Description
14
G003
Load pattern selection 1 0 For constant-torque load
1 For variable-torque load
12 to 15
*1
Excitation current low-speed scaling factor
(Refer to page 542.)
100%
Output voltage
Pr.3 Base frequency
Output frequency (Hz)
Pr.14 = 0
100%
Output voltage
Pr.3 Base frequency
Output frequency (Hz)
Pr.14 = 1
Parametersreferredto
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