MITSUBISHI ELECTRIC FR-S520 - Manual (Page 67)

58
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. Pr.0
Pr.46
Setting range
0 Output frequency (Hz)
Out
p
u
t
vo
lt
a
g
e
Parameter Name
Factory
Setting
Setting
Range
Remarks
0 Torque boost
6%/5%/4%
(Note)
0 to 15%
(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%
46 Second torque boost - - -
0 to 15%,
- - -
- - -: Function invalid. Setting is
enabled when Pr. 30 = "1".
<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
⇒
Pr. 60 to Pr. 63 "input terminal function
selection" (refer to page 88)
Constant-torque motor setting
⇒
Pr. 71 "applied motor" (refer to page 93)
Automatic torque boost control selection
⇒
Pr. 98 "automatic torque boost selection (motor
capacity)" (refer to page 109)