Motor Constants Selection - Hitachi SJ700D-004L Instruction Manual

Chapter 4

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 Function code
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 If you copy the data from a J300 series inverter to your SJ700 series inverter, set constants R1, R2, and Io as follows:
R1 = R1 /1.125
SJ700 J300
V: Voltage class (200 or 400 V)
*3 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).
*4 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 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 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 2nd control function is enabled and "00" is specified for the motor constant selection
 Directly input the desired values for "H220" to "H224".
- When the 2nd control function is enabled and "01" or "02" is specified for the motor constant selection
 Directly input the desired values for "H230" to "H234".
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".
Data or range of data
A044/A244/
A344
H002/H202
0.2 to 75.0 (kW)
H003/H203
<0.2 to 150(kW)>
H004/H204 2, 4, 6, 8, or 10 (poles)
H020/H220 0.000 to 65.53 (Ω)
H021/H221
0.000 to 65.53 (Ω)
H022/H222 0.00 to 655.3 (mH)
H023/H223 0.00 to 655.3 (A)
H024/H224
0.001 to 9999. (kgm
H030/H230 0.000 to 65.53 (Ω)
H031/H231 0.000 to 65.53 (Ω)
H032/H232 0.00 to 655.3 (mH)
H033/H233 0.00 to 655.3 (A)
H034/H234
0.001 to 9999. (kgm
R2 = R2 /1.2 Io = V/{272 x (2 x M
SJ700 J300
00 Constant torque characteristic (VC)
Reduced-torque characteristic (1.7th power of
01
VP)
02 (*1) Free V/f characteristic
03 (*1) Sensorless vector control (SLV)
04 (*1) 0 Hz-range sensorless vector control
05 (*1) Vector control with sensor (V2)
00 Hitachi general-purpose motor constants
01 Motor constants tuned by auto-tuning
02 Motor constants tuned by online auto-tuning
Note)<>applied for 75 to 150kW
(*2)
(*2)
(*2)
2
(*3)
)
2
)
+ L ) x 10
J300 J300
4-88
Explanation of Functions
Description
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