SJ700-2 Instruction Manual NT204DX - Hitachi America, Ltd.
SJ700-2 Instruction Manual NT204DX - Hitachi America, Ltd.
SJ700-2 Instruction Manual NT204DX - Hitachi America, Ltd.
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Chapter 4 Explanation of Functions<br />
c) All brakes are released.<br />
d) During auto-tuning, insufficient torque may cause a problem in the load driven by the motor (for<br />
example, a lift may slide down). Therefore, remove the motor from the machine or other load, and<br />
perform auto-tuning with the motor alone. (The moment of inertia [J] measured by auto-tuning is that of<br />
the motor alone. To apply the data, add the moment of inertia of the load machine to the measured J<br />
data after converting the moment of inertia into the motor shaft data.)<br />
e) If the motor is installed in a machine (e.g., lift or boring machine) that limits the motor shaft rotation, the<br />
allowable rotation limit may be exceeded during auto-tuning, and the machine may be damaged. To<br />
avoid this problem, specify "01" (auto-tuning without motor rotation) for the Auto-tuning Setting (H001).<br />
f) If the no-load current is unknown, operate the motor at 50 Hz in a V/f characteristic control mode to<br />
measure the motor current with current monitor. Then, set the measured current as the control<br />
constant "H023" or "H223" before auto-tuning.<br />
5) Even when "01" (auto-tuning without motor rotation) is specified for the Auto-tuning Setting (H001), the<br />
motor may rotate slightly during auto-tuning.<br />
6) When performing the auto-tuning for a motor of which the capacity is one class lower than that of the<br />
inverter, enable the overload restriction function, and set the overload restriction level to 1.5 times as<br />
high as the rated current of the motor.<br />
Operating procedure<br />
1) Specify "01" or "02" for the Auto-tuning Setting (H001).<br />
2) Input an operation command.<br />
When the operation command is input, the inverter performs an automatic operation in the following steps:<br />
(1) First AC excitation (The motor does not rotate.)<br />
↓<br />
(2) Second AC excitation (The motor does not rotate.)<br />
↓<br />
(3) First DC excitation (The motor does not rotate.)<br />
↓<br />
(4) Operation based on V/f characteristic control (The motor rotates at a<br />
speed up to 80% of the base frequency.)<br />
↓<br />
(5) Operation based on SLV control (The motor rotates at a speed up to<br />
x% of the base frequency.)<br />
↓<br />
(6) Second DC excitation (The motor does not rotate.)<br />
↓<br />
(7) Display of auto-tuning result<br />
Note 1: Steps (4) and (5) are skipped when the auto-tuning without motor rotation (H001 = 01) has been<br />
selected.<br />
Note 2: The motor speed (x) in step (5) is as follows. Assume that "T" is the acceleration or deceleration<br />
time in step (4), whichever is largest.<br />
When 0s ≤ T < 50 s, x = 40%.<br />
When 50 s ≤ T < 100 s, x = 20%.<br />
When 100 s ≤ T, x = 10%.<br />
Note 3: The tuning result is displayed as follows:<br />
Normal end<br />
Abnormal end<br />
If the auto-tuning has ended abnormally, retry it.<br />
(To clear the result display, press the STOP/RESET key.)<br />
Note 4: If the inverter trips during the auto-tuning, the auto-tuning is terminated forcibly.<br />
(In such cases, the monitor does not display the abnormal-end code, but displays a trip indication<br />
code.)<br />
In such cases, remove the cause of tripping, and then set H001=01 again to retry the auto-tuning.<br />
Note 5: If you cancel the auto-tuning midway with a stop command (by pressing the STOP/RESET key or<br />
turning off the operation command), the constants set for auto-tuning may remain in the inverter.<br />
Before retrying the auto-tuning, initialize the inverter, and then readjust the settings for the<br />
auto-tuning. (Perform the same procedure also when you proceed to the normal inverter<br />
operation.)<br />
Note 6: If an attempt is made to perform the auto-tuning with a free V/f characteristic selected as the<br />
control mode, the inverter will soon terminate the operation with the abnormal-end code displayed.<br />
Note 7: Even if the auto-tuning has ended normally, you cannot operate the inverter with the tuning data<br />
left. If you intend to operate the inverter with the tuning data left, be sure to switch the setting of<br />
motor constant selection (H002) to "01".<br />
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