Hitachi SJ200 Series - Manual (Page 89)

SJ200 Inverter
Conf
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Dr
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3–17
breakpoint of the boost (point A on the graph) by using parameters A042 and A043. The
manual boost is calculated as an addition to the standard V/f curve.
NOTE: Manual torque boost is not operational when intelligent sensorless vector
control is in use.
Be aware that running the motor at a low speed for a long time can cause motor
overheating. This is particularly true when manual torque boost is ON, or if the motor
relies on a built-in fan for cooling.
NOTE: Manual torque boost applies only to constant torque (A044=00) and variable
torque (A044=01) V/f control.
Voltage Gain – Using parameter A045 you
can modify the voltage gain of the inverter (see
graph at right). This is specified as a percent-
age of the full scale output voltage. The gain
can be set from 20% to 100%. It should be
adjusted in accordance with the motor specifi-
cations.
Intelligent Sensorless Vector Control (i SLV ) – This advanced torque control algorithm
improves torque performance at very low speeds—down to 0.5 Hz, as well as improve
regulation across the speed range. Set parameter A044=02 to select iSLV operation. The
iSLV algorithm automatically matches the characteristics of the particular motor
connected to your inverter. Auto-tuning is not required. The iSLV control includes
voltage compensation (A046) and slip compensation (A047).
NOTE: You must disable intelligent sensorless vector operation when two or more
motors are connected (parallel operation) to the inverter.
NOTE: If the inverter experiences over-current trips during deceleration, set AVR
Function Select (parameter A081) to “AVR enabled” (A081 = 00).
The following table shows the methods of torque control selection.
V
100%
20%
Hz
Voltage Gain
0
A045
“A” Function
Run
Mode
Edit
Defaults
Func.
Code
Name /
SRW Display
Description
–FEF
(EU)
–FU
(USA)
Units
A042 Manual torque boost
value
Can boost starting torque
between 0 and 20% above
normal V/f curve,
range is 0.0 to 20.0% ✔ 5.0 5.0 %
V-Bst V 0005.0%