4.2 Parameter Function Details
PARAMETERS
69
Pr. 3 "base frequency"
Pr. 19 "base frequency voltage"
Pr. 71 "applied motor"
Pr. 80 "motor capacity"
Pr. 180 to Pr. 183 (input terminal
function selection)
Related parameters
4.2 Parameter Function Details
4.2.1 Torque boost (Pr. 0, Pr. 46)
Pr. 0 "torque boost"
Pr. 46 "second torque boost"
Increase the setting when the inverter-to-motor distance is long or motor torque in the
low-speed range is insufficient, for example;
"
Motor torque in the low-frequency range can be adjusted to the load to increase the
starting motor torque.
"
You can select either of the two starting torque boosts by RT terminal switching.
Parameter
Number
Factory
Setting
Setting Range
Remarks
(Note)
FR-E520S-0.4K to 2.2K-EC
FR-E540-0.4K to 3.7K-EC
6%
0
6%/4%
(Note)
0 to 30%
FR-E540-5.5K, 7.5K-EC: 4%
46
9999
0 to 30%, 9999 9999: Function invalid
Pr.0
Pr.46
Setting range
0
100%
Ou
tp
ut
vo
lt
ag
e
Output frequency (Hz)
Base frequency
<Setting>
!
Assuming that the base frequency voltage is 100%, set the 0Hz voltage in %.
!
Pr. 46 "Second torque boost" is valid when the RT signal is on. (Note 3)
!
When using the inverter-dedicated motor (constant-torque motor), change the
setting as indicated below:
FR-E540-0.4K, 0.75K-EC, FR-E520S-0.4K, 0.75K-EC........6%
FR-E540-1.5K to 3.7K-EC, FR-E520S-1.5K, 2.2K-EC.........4%
FR-E540-5.5K, 7.5K-EC ......................................................3%
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.
Note: 1. This parameter setting is ignored when the general-purpose magnetic flux
vector control mode has been selected.
2. A large setting may result in an overheated motor or overcurrent trip. The
guideline for the largest value for this parameter is about 10%.
3. The RT signal serves as the second function selection signal and makes the
other second functions valid. Refer to page 148 for Pr. 180 to Pr. 183 (input
terminal function selection).
4
