Mitsubishi Electric FR-A820-00046 Instruction Manual page 897

Parameters
Switching applied load selection with a terminal (Pr. 14 = "4, 5")
● It is possible to switch between for constant-torque load and for lift with RT signal or X17 signal.
● To input the X17 signal, set "17" in any of Pr. 178 to Pr. 189 (input terminal function selection) to
assign the function.
● Switching with RT signal will become disabled when X17 signal is assigned.
Pr. 14 setting
Tab. 5-315: Load selection by terminal
Excitation current low-speed scaling factor (Pr. 14 = 12 to 15)
● Under Advanced magnetic flux vector control or Real sensorless vector control, excitation current
in the low-speed range can be increased to improve torque. When Pr.14 = "12 to 15", the excitation
current scaling factor can be switched for the forward/reverse rotation.
● Increased excitation is applied when the output frequency is equal to or lower than the setting in
Pr. 85 "Excitation current break point". The excitation current scaling factor at 0 Hz is set in Pr. 86.
Use Pr. 565 "Second motor excitation current break point" and Pr. 566 "Second motor excitation
current low-speed scaling factor" for the setting for using the second motor (RT signal-ON).
Fig. 5-344:
● When Pr. 14 = "14 or 15" and the X17 signal is turned ON, the excitation current scaling factor is
switched from the value set in Pr. 617 to the value set in Pr. 86.
● An excitation current low-speed scaling factor set in the parameter shown in the table is used
according to the Pr. 14 setting and other conditions.
FR-A800
RT (X17) signal
ON
4
OFF
ON
5
OFF
Excitation current scaling factor
Pr. 86
(Pr. 566)
100%
0
Operation example for the excitation current scaling factor
Output characteristics
For constant-torque load (same as setting value "0")
For lift, boost at reverse rotation 0% (same as setting value "2")
For constant-torque load (same as setting value "0")
For lift, boost at forward rotation 0% (same as setting value "3")
Pr. 85
(Pr. 565)
(G) Control parameters
Output frequency
I003101E
5 - 695