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Parameter Function Details; Torque Boost (pr. 0, Pr. 46, Pr. 112) - Mitsubishi Electric FR-A520-0.4K -55K Instruction Manual

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4.2 Parameter Function Details

z
4.2 Parameter Function Details

Torque boost (Pr. 0, Pr. 46, Pr. 112)

Pr. 0 "torque boost"
Pr. 46 "second torque boost"
Pr. 112 "third torque boost"
You can compensate for a voltage drop in the low frequency
range to
improve motor torque reduction in the low speed range.
Motor torque in the low-frequency range can be adjusted to the load to increase the starting motor torque.
z
You can select any of the three different starting torque boosts by terminal switching.
z
Parameter
Factory
Setting Range
Number
Setting
0.4K, 0.75K
6%
1.5K to 3.7K
4%
0
5.5K, 7.5K
3%
11K or more
2%
46
9999
0 to 30%, 9999
112
9999
0 to 30%, 9999
<Setting>
Assuming that the base frequency voltage is 100%, set the 0Hz voltage in %.
x
A large setting will cause the motor to overheat. The guideline for maximum value is about 10%.
x
Pr. 46 is valid when the RT signal is on. Pr. 112 is valid when the X9 signal is on. Use any of Pr. 180 to
x
Pr. 186 to assign the terminal used to input the X9 signal.
Note: 1. When using a constant-torque motor, change the setting of this parameter as follows:
0.4K, 0.75K...6%, 1.5K to 3.7k, 4%, 5.5K or more...2%
2. This parameter setting is ignored when Pr. 80 and Pr. 81 have been set to select the advanced
magnetic flux vector control mode.
3. When the Pr. 0 setting is either of the following values for 5.5K and 7.5K, it is automatically
changed when the Pr.71 setting is changed:
(1) When Pr. 0 setting is 3% (factory setting)
The Pr. 0 setting is changed to 2% automatically when the Pr. 71 setting is changed from
[general-purpose motor selection value (0, 2 to 8, 20, 23, 24)] to [constant-torque motor
selection value (1, 13 to 18)].
(2) When Pr. 0 setting is 2%
The Pr. 0 setting is changed to 3% (factory setting) automatically when the Pr. 71 setting is
changed from [constant-torque motor selection value (1, 13 to 18)] to [general-purpose motor
selection value (0, 2 to 8, 20, 23, 24)].
4. Increase the setting when the inverter-to-motor distance is long or motor torque in the low-speed
range is insufficient, for example. A too large setting may result in an overcurrent trip.
5. When the RT (X9) signal is on, the other second (third) functions such as second (third)
acceleration/deceleration time are also selected.
6. When terminal assignment is changed using Pr. 180 to Pr. 186 during use of the second or third
functions, the other functions may be affected. Check the functions of the corresponding
terminals before making setting.
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Remarks

0 to 30%
9999: Function invalid
9999: Function invalid
63
PARAMETERS
Related parameters
Pr. 3 "base frequency"
Pr. 19 "base frequency voltage"
Pr. 71 "applied motor"
Pr. 80 "motor capacity"
Pr. 81 "number of motor poles"
Pr. 180 to Pr. 186
(input terminal function selection)
100%
Pr.0
Pr.46
Setting range
Pr.112
0
Output frequency (Hz)
Base frequency

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