Motor Constants Selection - Hitachi SJ700B Series Instruction Manual

Chapter 4 Explanation of Functions

4.2.95 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
characteristic, 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 the motor
may result in a reduced motor or unstable motor operation.
You can select the motor constants that are used when the control mode is the sensorless vector control,
0Hz-range sensorless vector control, or vector control with sensor from the following three types:
(1) Motor constants of Hitachi general-purpose motor
(2) Motor constants tuned by offline auto-tuning
(3) Arbitrarily set motor constants
The motor constants set for the 1st motor control apply to the 3rd motor control.
Item
V/F characteristic
curve selection
Motor data
selection
Motor capacity
Motor poles setting
Motor constant R1
Motor constant R2
Motor constant L
Motor constant Io
Motor constant J
Auto constant R1
Auto constant R2
Auto constant L
Auto constant Io
Auto constant J
*1 Any of "00" to "05" can be selected for the 1st motor (A044). Only "00" to "04" can be selected for the
2nd motor (A244). Only "00" or "01" can be selected for the 3rd motor (A344).
*2 Convert the moment of inertia (J) into the motor shaft data. When the value of J is large, the motor
response is fast, and the motor torque increases quickly. When the value of J is small, the motor
response is slow, and the motor torque increases slowly. To control the response, set the value of J,
and then adjust the speed response (H005/H205).
*3 In the modes of sensorless vector control, 0Hz-range sensorless vector control and vector control with
sensor, inverter may output reverse to given operation command in the low speed range as a nature of
those control. In case there is a specific inconvenience for example reverse rotation damage the
machine, enable the reverse run protection (b046). (see 4.2.101: Reverse run protection function)
Arbitrary setting of motor constants
For the arbitrary setting of the motor constants, the function codes requiring settings vary depending on
the settings of the 1st/2nd control function and the motor constant selection.
- When the 1st/2nd control function is enabled and "00" is specified for the motor constant selection →
Directly input the desired values for "H020" to "H024".
- When the 1st/2nd control function is enabled and "01" or "02" is specified for the motor constant
selection → Directly input the desired values for "H030" to "H034".
When the offline auto-tuning has not been performed, the constants (Hitachi general-purpose motor
constants) of the motors in the same capacity class as the inverter have been set for "H030/H230" to
"H034/H234".
Function
Data or range of data
code
A044/A244/
A344
H002/H202
H003/H203
H004/H204 2, 4, 6, 8, or 10 (poles)
H020/H220 0.001 to 9.999/10.00 to 65.53 (Ω)
H021/H221
0.001 to 9.999/10.00 to 65.53 (Ω)
H022/H222 0.01 to 99.99/100.0 to 655.3 (mH)
H023/H223 0.01 to 99.99/100.0 to 655.3 (A)
0.001 to 9.999/10.00 to 99.99/100.0
H024/H224
to 999.9/1000. to 9999. (kgm
H030/H230 0.001 to 9.999/10.00 to 65.53 (Ω)
H031/H231 0.001 to 9.999/10.00 to 65.53 (Ω)
H032/H232 0.01 to 99.99/100.0 to 655.3 (mH)
H033/H233 0.01 to 99.99/100.0 to 655.3 (A)
0.001 to 9.999/10.00 to 99.99/100.0
H034/H234
to 999.9/1000. to 9999. (kgm
00
01
02 (*1)
03 (*1)
04 (*1)
05 (*1)
00
01
02
0.2 to 75.0 (kW)
2
)
2
)
4 - 88
Description
Constant torque characteristic (VC)
Reduced-torque characteristic
(1.7thpower of VP)
Free V/f characteristic
Sensorless vector control (SLV)
0 Hz-range sensorless vector control
Vector control with sensor (V2)
Hitachi general-purpose motor onstants
Motor constants tuned by auto-tuning
Motor constants tuned by online
auto-tuning
(*2)