Explanation Of Functions (Parameters); Torque Boost (Pr. 0 , Pr. 46 ) - Mitsubishi Electric FR-S520E Series Instruction Manual

2.3 Explanation of functions (parameters)

2.3.1 Torque boost (Pr. 0
Increase the setting value when the
distance between the inverter and
motor is long or when the motor torque
in the low speed range is insufficient
(when stall prevention is activated), etc.
Motor torque in the low-frequency
range can be adjusted to the load to
increase the starting motor torque.
Parameter Name
0 Torque boost
Second
46
torque boost
<Setting>
•Assuming that the base frequency voltage is 100%, set the 0Hz voltage in %.
Use the RT signal to switch between two different torque boosts. (Turn on the RT
signal to make Pr. 46 valid(*).)
REMARKS
* The RT signal acts as the second function selection signal and makes the other second functions valid.
When using an inverter-dedicated motor (constant-torque motor), make setting as
indicated below.
(If the factory 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 the following table.)
Inverter Type Inverter Capacity Factory Setting
FR-S520E 0.1K to 0.75K
FR-S520SE
1.5K to 3.7K
FR-S510WE
0.4K, 0.75K
1.5K
FR-S540E
2.2K
3.7K
CAUTION
•Selecting automatic torque boost control makes this parameter setting invalid.
•A too large setting may cause the motor to overheat or result in an
overcurrent trip. The guideline is about 10% at the greatest.
♦
Related parameters
•
RT signal (second function "Pr. 46") setting⇒ Pr. 60 to Pr. 63 "input terminal function selection"
•
Constant-torque motor setting ⇒ Pr. 71 "applied motor" (refer to page 78)
•
Automatic torque boost control selection ⇒ Pr. 98 "automatic torque boost selection (motor
, Pr. 46
Factory Setting Setting Range
6%/5%/4% 0 to 15%
0 to 15%,
- - -
6%
6%
5%
4%
♦
(refer to page 108)
capacity)" (refer to page 132)
71

Explanation of functions (parameters)

)
Pr.0
Setting range
Pr.46
0 Output frequency (Hz)
The factory setting varies
according to the inverter capacity.
(Refer to the following table for
details.)
- - -: Function invalid. Setting is
- - - enabled when Pr. 30 = "1".
Constant-torque Motor Setting
6% (no change)
6% (no change)
Remarks
4%
4%
3%
2