Mitsubishi Electric F700 User Manual

70
Adjust the output torque of the motor (current)
4.3 Adjust the output torque of the motor (current)
4.3.1 Manual torque boost (Pr. 0, Pr. 46)
(2) Set multiple torque boost (RT signal, Pr. 46)
⋅ Use the second torque boost when changing the torque boost according to application or when using multiple
motors by switching between them by one inverter.
⋅ Pr. 46 Second torque boost is made valid when the RT signal turns on.
Purpose Parameter that must be Set Refer to Page
Set starting torque manually Manual torque boost Pr. 0, Pr. 46 70
Automatically control output current
according to load
Simple magnetic flux
vector control
Pr. 71, Pr. 80, Pr. 90 71
Compensate for motor slip to secure
low-speed torque
Slip compensation Pr. 245 to Pr. 247 72
Limit output current to prevent inverter
trip
Stall prevention operation
Pr. 22, Pr. 23, Pr. 66,
Pr. 154, Pr. 156, Pr. 157
73
You can compensate for a voltage drop in the low-frequency region to improve motor torque reduction in the low-
speed range.
zMotor torque in the low-frequency range can be adjusted to the load to increase the starting motor torque.
zThe starting torque boost can be changed by switching terminals.
Parameter
Number
Name Initial Value
Setting
Range
Description
0 Torque boost
0.75K 6%
0 to 30% Set the output voltage at 0Hz as %.
1.5K to 3.7K 4%
5.5K, 7.5K 3%
11K to 37K 2%
45K, 55K 1.5%
75K or more 1%
46
*1
Second torque
boost
9999
0 to 30%
Set the torque boost value when the
RT signal is on.
9999 Without second torque boost
*1 They can be set when Pr. 160 User group read selection = "0". (Refer to page 156.)
(1) Starting torque adjustment
⋅ On the assumption that Pr. 19 Base frequency voltage is
100%, set the output voltage at 0Hz in % in Pr. 0 (Pr. 46).
⋅ Adjust the parameter little by little (about 0.5%), and check
the motor status each time. If the setting is too large, the
motor will overheat. The guideline is about 10% at the
greatest.
REMARKS
⋅ The RT signal acts as the second function selection signal and makes the other second functions valid. (Refer to page 103)
⋅ The RT signal is assigned to the RT terminal in the default setting. By setting "3" to any of Pr. 178 to Pr. 189 (Input terminal function
selection), you can assign the RT signal to the other terminal.
CAUTION
⋅ Increase the setting when the distance between the inverter and motor is long or when motor torque is insufficient in the low-
speed range. If the setting is too large, an overcurrent trip may occur.
⋅ The Pr. 0 and Pr. 46 settings are valid only when V/F control is selected.
⋅ When using the inverter dedicated motor (constant torque motor) with the 5.5K or 7.5K, set the torque boost value to 2%. If the
initial set Pr. 71 value is changed to the setting for use with a constant-torque motor, the Pr. 0 setting changes to the
corresponding value in above.
⋅ Changing the terminal assignment using Pr. 178 to Pr. 189 (input terminal function selection) may affect the other functions. Please
make setting after confirming the function of each terminal.
♦ Parameters referred to ♦
Pr. 3 Base frequency, Pr. 19 Base frequency voltage Refer to page 80
Pr. 71 Applied motor Refer to page 97
Pr. 80 Motor capacity Refer to page 71
Pr. 178 to Pr. 189 (Input terminal function selection) Refer to page 101
Output
voltage
P
r. 0
P
r.46
Setting
range
Base
frequency
0
100%
Output
frequency
(Hz)

Mitsubishi Electric F700 Specifications

General

Brand	Mitsubishi Electric
Model	F700
Category	Inverter
Language	English