Setting Motor Constants; Adjusting Motor Stability - Hitachi L300P Series Instruction Manual

Setting Motor Constants

Introduction
The inverter has two separate motor constant sets named 1st, and 2nd. The 1st motor constant
set is the default, while the SET intelligent input selects the 2nd motor constant set. The follow-
ing table lists the V/f characteristic control methods:
V/f constant torque
V/f variable torque
V/f free-setting curve
The following table lists the parameters associated with motor constant settings. Set each
constant according the motor type in the application. When connecting more than one motor (in
parallel) to the inverter, set the constant values that are closest to the total capacity of the
combined motors.
Adjusting Motor
Observe the motor for instability, particularly when it is rotating at constant speed. A common
Stability symptom of instability, sometimes called "hunting," is marked by a "rattling" sound in the
motor. To correct the instability, you can adjust some of the parameters listed above.
• Check the motor capacity (H003 / H203), and ensure it matches the capacity of your motor.
• Check the motor poles setting (H004 / H204), and ensure it matches your motor.
• If you are using a stabilization constant (H006 / H206) that is lower than the default setting,
• If the motor you are using is greater than the rated capacity of the inverter, lower the value of
• If instability persists after you have checked the items above, try the procedures in the table
V/f Characteristic Control Method
Func. Name
A044 / V/f characteristic curve selection,
A244 1st / 2nd motors
H003 Motor capacity, 1st motor
H203 Motor capacity, 2nd motor
H004 Motor poles setting, 1st motor
H204 Motor poles setting, 2nd motor
Motor stabilization constant, 1st
H006
motor
Motor stabilization constant, 2nd
H206
motor
trying raising it gradually up to the default value.
H006 / H206.
below. As soon as adjusting a parameter seems to produce stability, don't change the param-
eter further. If adjusting a parameter has no effect, restore it to its original (or default) value.
Func. Name
A045 Output gain
B083 Carrier frequency
H006 / H206 Motor stabilization constant
1st motor 2nd motor
✔ ✔
✔ ✔
✔ ✔
Data
00 V/f constant torque
01 V/f variable torque
02 V/f free-setting curve
0.2 – 75 Units: kW
0.2 – 75 Units: kW
2 / 4 / 6 / 8 Units: poles
2 / 4 / 6 / 8 Units: poles
100
100
Data Range
20 – 100 Lower this value
0.5 – 8.0 Lower this value
0 – 255 Lower or raise this value
4–57
L300P Inverter
Notes
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Procedure