LSIS 6731001500, User Manual

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Learning Protection Features
6.1.4 Stall Prevention and Flux Braking
The stall prevention function is a protective function that prevents motors from stalling due to
overloads. If a motor stall occurs due to an overload, the inverter operation frequency is adjusted
automatically. When a stall is caused by overload, high currents induced in the motor may cause
motor overheating or damage the motor and interrupt operation of the motor-driven devices.
In this case, the motor decelerates with optimum deceleration without a braking resistor by using
flux braking. If the deceleration time is too short, an over voltage fault trip may occur because of
regenerative energy from the motor. The flux braking makes the motor use regenerate energy,
therefore optimum deceleration is available without over voltage fault trip.
To protect the motor from overload faults, the inverter output frequency is adjusted automatically,
based on the size of load.
Group Code Name LCD Display Parameter Setting Setting range Unit
PRT
50
Stall prevention and
flux braking
Stall Prevent 0100 - bit
51 Stall frequency 1 Stall Freq 1 60.00
Start Freq–Stall
Freq 1
Hz
52 Stall level 1 Stall Level 1 130 30–150 %
53 Stall frequency 2 Stall Freq 2 60.00
Stall Freq 1–
Stall Freq 3
Hz
54 Stall level 2 Stall Level 2 130 30–150 %
55 Stall frequency 3 Stall Freq 3 60.00
Stall Freq 2–
Stall Freq 4
Hz
56 Stall level 3 Stall Level 3 130 30–150 %
57 Stall frequency 4 Stall Freq 4 60.00
Stall Freq 3–
Max Freq
Hz
58 Stall level 4 Stall Level 4 130 30–150 %
59 Flux Braking Gain Flux Brake kp 0
0.75-
90kW
0–150
-
110-
500kW
0–10
OUT
31
–35 Multi-function relay
1–5 item
Relay 1–5 9 Stall - -