149
"H" Group: Motor Constants Functions Section 3-8
3-8-1 Motor Constants Selection
Adjust the motor constant settings to the motor to be driven by the inverter.
When using a single inverter to drive multiple motors in the control mode
based on VC, VP, or free V/F characteristics, calculate the total capacity of the
motors, and specify a value close to the total capacity for the motor capacity
selection (H003/H203).
When the automatic torque boost function is used, the motor constant settings
that do not match with the motor may result in a reduced motor torque, or
unstable motor operation.
You can select the motor constants that are used when the control mode is
the sensorless vector control (hereafter "SLV") from the following three types.
1. Motor constants of standard induction motor
When H002/H202=00, motor constants in H020/H220 to H024/H224 are tak-
en. The initial values in H020/H220 to H024/H224 are standard motor's val-
ues.
2. Motor constants obtained by off-line auto-tuning
When H002/H202=02, motor constants in H030/H230 to H034/H234 are tak-
en, which are obtained by off-line auto-tuning.
3. Arbitrarily set motor constants
In above (1) and (2) cases, motor constants can be adjusted manually. Ac-
cording to value of H002/H202, change motor constants in H020/H220 to
H024/H224 or H030/H230 to H034/H234 if necessary.
*1) Convert the inertia (J) to the motor shaft value. Bigger J value will result in
a quicker in motor response and quicker in torque increase. Smaller J value
will result in the opposite way.
*2) In the SLV modes, inverter may give out reverse to given operation com-
mand in the low speed range as a nature of those controls. In case there is a
specific inconvenience for example reverse rotation damages the machine,
enable the reverse run protection (b046).
H031 Motor constant R2 (Auto tuned
data)
0.001~65.535 ohms 8 Specified by
the capacity of
each inverter
model
Ohm
H231 Motor constant R2, 2
nd
motor
(Auto tuned data)
8 Ohm
H032 Motor constant L (Auto tuned
data)
0.01~655.35mH 8 Specified by
the capacity of
each inverter
model
mH
H232 Motor constant L, 2
nd
motor
(Auto tuned data)
8 mH
H033 Motor constant I0 (Auto tuned
data)
0.01~655.35A 8 Specified by
the capacity of
each inverter
model
A
H233 Motor constant I0, 2
nd
motor
(Auto tuned data)
8 A
H034 Motor constant J (Auto tuned
data)
0.001~9999 kgm2 8 Specified by
the capacity of
each inverter
model
kgm²
H234 Motor constant J, 2
nd
motor
(Auto tuned data)
8 kgm²
H050 Slip compensation P gain for
V/f control with FB
0.00~10.00 8 0.2 -
H051 Slip compensation I gain for V/f
control with FB
0.~1000. 8 2-
"H" Function Run
Mode
Edit
Defaults
Func.
Code
Name Description EU Units
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