Mitsubishi Electric FR-D720S SC EC, Инструкция по эксплуатации, Страница: 177 / 512

Parameter Adjust the output torque (current) of the motor
FR-D700 SC EC 6 - 27
Starting torque adjustment
The set value indicates the percentage of the maximum output voltage at 0Hz by which the out-
put voltage is increased. The voltage increases in direct proportion to the frequency from the
time of startup until the operating frequency and voltage have been reached.
Set multiple base frequencies (RT signal, Pr. 46)
Use the second torque boost when changing the torque boost according to application or when
using multiple motors by switching between them by one inverter.
Pr. 46 "Second torque boost" is made valid when the RT signal turns on. For the terminal used
for RT signal input, set "3" in any of Pr. 178 to Pr. 182.
Fig. 6-1:
Relationship between output frequency and
output voltage
I000001C
b
CAUTION:
This setting should be made with great care.
If the set value is too high then the motor is operated with overvoltage and reaches
magnetic saturation. The current consumption rises dramatically in a saturated motor
without any concomitant improvement in torque. Adjust the parameter little by little
(about 0.5%), and check the motor status each time. If the setting is too large, the
motor will overheat. The guideline is about 10% at the greatest.
The requirements of the motor manufacturer must also be observed.
100
50
30
[%]
fB
Setting range Pr. 0, Pr. 46
Output v
o
ltage