Mitsubishi Electric FR-A820-00046 (0.4K), Instruction Manual

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Parameters (G) Control parameters
FR-A800 5 - 693
The setting is applied to the operation under V/F control.
The setting is valid only under Advanced magnetic flux vector control or Real sensorless vector
control. When Pr. 14 = "12 to 15" and V/F control is selected, the operation is the same as the one
for constant-torque load (Pr. 14 = "0").
Application for constant-torque load (Pr. 14 = "0", initial value)
●
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.
565
G301
Second motor
excitation current
break point
9999
0 to 400 Hz Set an excitation current break point when the RT signal is ON.
9999
SF-PR/SF-HR/SF-HRCA motor: The predetermined frequency is
applied.
Motor other than the above: 10 Hz is applied.
566
G302
Second motor
excitation current
low-speed scaling
factor
9999
0 to 300%
Set an excitation current low-speed scaling factor when the RT
signal is ON.
9999
SF-PR/SF-HR/SF-HRCA motor: The predetermined scaling factor is
applied.
Motor other than the above: 130% is applied.
Fig. 5-341:
Constant-torque load
I002750E
NOTE 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.
Pr. Name
Initial
value
Setting
range
Description
100%
Output v
o
ltage
Pr. 3 Base frequency
Output frequency (Hz)