Troubleshooting
7-
35
Autotuning has not been performed with vector control.
Vector control will not perform if autotuning has not been performed. Perform autotuning separately for the
motor, or set the motor constants through calculations. Alternatively, change the Control Method Selection
(A1-02) to V/f control.
If the Torque Generated for the Motor is Insufficient (Insufficient Power)
If autotuning has not been performed, or the control method has been changed since last performing autotun-
ing, perform autotuning. If the problem occurs after performing stationary autotuning, perform rotational auto-
tuning.
The torque is insufficient with open-loop vector 2 control (insufficient power).
In particular, if there is insufficient power at low speeds, make adjustments using the following methods.
Low-speed Electromotive Load (PRG 102 only)
Increase the setting of N4-29 (torque adjustment gain 2). Increase the setting in intervals of approximately
0.05. If the setting is too high, it may have the opposite effect and so do not change the setting by a large
amount.
Low-speed Regenerative Load (PRG 102 only)
Increase the setting of N4-15 (low-speed regeneration stability coefficient 1). Increase the setting in intervals
of approximately 0.1. If the setting is too large, the torque reference monitor and the actual torque accuracy
may deteriorate and so do not change the setting by a large amount.
If the Torque Reference (U1-09) at Low Speeds in Open-loop Vector 2
Control is Large Compared to That at Medium and High Speeds
If the torque reference (U1-09) at low speeds is large compared to that at medium and high speeds for the
same load conditions, make adjustments in the way described below.
• Reduce the setting for N4-17 (torque adjustment gain).
• If the problem still occurs after making the above adjustment, linearize the V/f characteristics. This means
making the ratios E1-10/E1-09 and E1-08/E1-07 closer to the ratio E1-13/E1-06. Linearizing the V/f char-
acteristics will, however, reduce the power and so check that the power is sufficient after changing the set-
tings. Do not change the settings more than necessary.
If Shock Occurs Near the Speed Estimator Switching Frequency in Open-
loop Vector 2 Control (PRG 102 only)
The switching frequency refers to the frequency range near the N4-11 setting during acceleration and near the
N4-28 setting during deceleration. In open-loop vector 2 control, two speed estimators are switched between
and there may be instances of shock occurring at the switchover. If switching shock is a problem, make the
adjustments described below.
• If shock occurs during acceleration:
• Increase the acceleration time within the allowable range. Alternatively, reduce the torque limit.
TOE-S616-60.1.book 35 ページ ２０１７年８月４日 金曜日 午後３時４１分
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