Mitsubishi Electric FR-F820-00077 Instruction Manual page 712

(G) Control parameters
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 frequen-
cy or lower. (1.75th-power curve for FR-F820-01540(37K) or higher, and FR-F840-00770(37K) 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.
Parameters referred to
Pr. 0
Pr. 3
Pr. 178 to Pr. 182
5 - 540
100%
Pr. 3 Base frequency
Output frequency (Hz)
Torque boost
Base frequency
(input terminal function selection)
Fig. 5-262:
Variable-torque load
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Parameters
I002751E
page 5-535
page 5-537
page 5-285