LSIS H100, Operation Manual

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323
Learning Protection Features
Note
Overload warnings warn of an overload before an overload fault trip occurs. The overload
warning signal may not work in an overload fault trip situation, if the overload warning level (OL
Warn Level) and the overload warning time (OL Warn Time) are set higher than the overload trip
level (OL Trip Level) and the overload trip time (OL Trip Time).
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
–
Maximum Freq
Hz
58 Stall level 4 Stall Level 4 130 30
–150
%