Hitachi S1 Series Basic Manual page 115

S1 series standard inverter
Function
Name
code
V/F frequency
P04.03
point 1 of motor 1
V/F voltage point
P04.04
1 of motor 1
V/F frequency
P04.05
point 2 of motor 1
V/F voltage point
P04.06
2 of motor 1
V/F frequency
P04.07
point 3 of motor 1
V/F voltage point
P04.08
3 of motor 1
Detailed parameter description
Users should select torque boost based on the
load, eg, larger load requires larger torque boost,
however, if the torque boost is too large, the motor
will run at over-excitation, which will cause
increased output current and motor heat-up, thus
degrading the efficiency.
When torque boost is set to 0.0%, the inverter is
automatic torque boost.
Torque boost cut-off threshold: Below this
frequency threshold, the torque boost is valid,
exceeding this threshold invalidates torque boost.
Output voltage
v
b
v
boost
Setting range of P04.01: 0.0%: (automatic) 0.1%–
10.0%
Setting range of P04.02: 0.0%–50.0%
When P04.00 =1 (multi-point V/F curve), users
can set V/F curve via P04.03–P04.08.
V/F curve is usually set according to the
characteristics of motor load.
Note: V1<V2<V3, f1<f2<f3. If low-frequency
voltage is set too high, motor overheat or
burnt-down may occur, and overcurrent stall or
overcurrent protection may occur to the inverter.
Output voltage
100.0%
V
b
V3
V2
V1
Setting range of P04.03: 0.00Hz–P04.05
Setting range of P04.04: 0.0%–110.0% (rated
voltage of motor 1)
-110-
Output
frequency
f
f
Cut-off
Output
frequency(Hz)
f1 f2 f3 f
b
Default
Modify
value
○
0.00Hz
○
00.0%
○
0.00Hz
○
0.0%
○
0.00Hz
○
00.0%