Explanation Of Functions (Parameters); Torque Boost - Mitsubishi FR - S500 Instruction Manual

2

.3 Explanation of Functions (Parameters)

2
.3.1

Torque boost

Increase this value for use when the
inverter-to-motor distance is long or
motor torque is insufficient in the low
speed range (stall prevention is
activated).
Motor torque in the low-frequency
range can be adjusted to the load
to increase the starting motor
torque.
Parameter Name
0 Torque boost
46 Second 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.
FR-S520-0.1K to 0.75K ..... 6%, FR-S520-1.5K to 3.7K ..... 4%
FR-S540-0.4K, 0.75K ..... 6%, FR-S540-1.5K ..... 4%,
FR-S540-2.2K, 3.7K ..... 3%
FR-S520S-0.1K to 0.75K ..... 6%, FR-S520S-1.5K ..... 4%
FR-S510W-0.1K to 0.75K ..... 6%
If you leave the factory setting as it is and change the Pr. 71 value to the setting for
use of the constant-torque motor, the Pr. 0 setting changes to the above value.
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
Constant-torque motor setting
Automatic torque boost control selection
Pr.0
Setting range
Pr.46
Factory Setting
Setting Range
6%/5%/4%
0 to 15%
(Note)
0 to 15%,
- - -
- - -
Pr. 60 to Pr. 63 "input terminal function
selection" (refer to page 88)
Pr. 71 "applied motor" (refer to page 93)
Pr. 98 "automatic torque boost selection (motor
capacity)" (refer to page 109)
58
0 Output frequency (Hz)
Remarks
(Note) FR-S520 (S)-0.1K to 3.7K: 6%
FR-S540-0.4K, 0.75K: 6%
FR-S510W-0.1K to 0.75K: 6%
FR-S540-1.5K, 2.2K: 5%
FR-S540-3.7K: 4%
- - -: Function invalid. Setting is
enabled when Pr. 30 = "1".