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Functions
8.4 Motor protection
Operating principle
The approximate temperature of the motor is calculated using the measured motor currents and
the parameter settings "Rated operational current I
motor is overloaded or is functioning in the normal operating range. When overload is detected,
the 3RW51 soft starter shuts the motor down. The setting for RESET MODE determines how the
motor is restarted.
Parameters
NOTICE
Property damage due to overload.
If the trip class is set to CLASS OFF, the motor will not have any protection at all.
Parameter
Trip class
Rated operational current I
Recovery time following motor overload protection tripping
When the motor overload protection is tripped and Auto-RESET MODE is set, the fault will be
reset automatically after a recovery time of 5 minutes. With selection of manual RESET or remote
RESET, a RESET is only possible following completion of the recovery time of 5 minutes.
96
Description
The trip class specifies the maximum time within which a protective device
must trip from a cold state at 7.2 x the rated operational current I
protection to IEC 60947).
•
CLASS OFF: Deactivates the electronic motor overload protection
•
CLASS 10A / 10E / 20E: Tripping times according to the trip class
The rated operational current I
e
conducted by the feeder (switchgear and motor). This is normally the rated
operational current I
of the motor and depends on whether the motor is
e
connected in an inline or an inside-delta circuit.
Equipment Manual, 09/2020, A5E37108631002A/RS-AC/003
" and "trip class". This indicates whether the
e
is the current that can be continuously
e
SIRIUS 3RW51 Soft Starter
(motor
e
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