Frequency Switching Acceleration/Deceleration At Light Load (F339) - Toshiba TOSVERT VF-S15 Instruction Manual

《Cautions》
• If the result of learning operation is as follows, the learning operation is completed when it
stops without transition to the high-speed operation.
Switching load torque during power running (f335) is 70% or more
Switching load torque during regenerative braking (f338) is 70% or more
• If a detected torque is 150% or more during acceleration of the high-speed operation, the
high-speed operation stops and the learning operation is completed without reflecting the
learning data.
• If a detected torque is 100% or more during constant speed operation after completing the
acceleration of the high-speed operation, the high-speed operation stops and the learning
operation is completed without reflecting the learning data.
• Do not change the frequency command value, acceleration time, direction of rotation and
related parameters, and not input the light-load high-speed operation prohibitive signal
before the learning operation is completed.
The learning operation may not complete correctly.
• "tun2""means that the learning operation is impossible.
･f331> f330
･f328 = 1 or 2
･Operation frequency < f331
･Acceleration time >100s
･Direction of rotation is opposite of f329 setting
･The light-load high-speed operation prohibitive signal is ON
If the reflecting the learning data is completed, "tun2""is not displayed.
• "tun2""may be displayed when the inverter starts because of the torque control at the
start. Normal if "tun2" disappears after output frequency reaches f331 or more.
• "tun3""is displayed when the inverter detect heavy load.
3.3.3 Frequency switching Acceleration/deceleration at light
load (f339)
During light-load high-speed operation, if operation frequency exceeds frequency switching acceleration/
deceleration at light load (f339), switch acceleration/ deceleration time to acceleration/ deceleration
time 2 (f500, f501).
Acceleration/ deceleration time 3 (f510, f511) has priority over frequency switching Acceleration/
deceleration at light load.
In addition, this function is reset with the following conditions;
- Operation frequency reached the set speed (reached to the set frequency)
- After switching forward/ reverse operation (switching from forward to reverse operation, or conversely)
- After the inverter stopped
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E6581871