P3.9.10 MOTOR THERMAL LOADABILITY (ID 708)
Use this parameter to set the thermal loadability of the motor.
For example, if you set the value to 130%, the motor goes to the nominal temperature with
130% of the motor nominal current.
I/IT
t
t
T
Current
Fault/
Alarm
Loadability 80%
Loadability 100%
Loadability 130%
105%
Trip area
Fig. 29: The calculation of the motor temperature
10.9.2
MOTOR STALL PROTECTION
The motor stall protection function gives protection to the motor against short overloads. An
overload can be caused, for example, by a stalled shaft. It is possible to set the reaction time
of the stall protection shorter than that of the motor thermal protection.
The stall status of the motor is specified with parameters P3.9.12 Stall Current and P3.9.14
Stall Frequency Limit. If the current is higher than the limit, and the output frequency is
lower than the limit, the motor is in a stall status.
The stall protection is a type of overcurrent protection.
PARAMETER DESCRIPTIONS
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