Operating principle
The approximate temperature of the motor is calculated using the measured motor currents and
the parameter settings "Rated operational current I
e
" and "trip class". This indicates whether the
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
Description
Trip class
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
e
(motor
protection to IEC 60947).
• CLASS OFF: Deactivates the electronic motor overload protection
• CLASS 10A / 10E / 20E: Tripping times according to the trip class
Rated operational current I
e
The rated operational current I
e
is the current that can be continuously
conducted by the feeder (switchgear and motor). This is normally the rated
operational current I
e
of the motor and depends on whether the motor is
connected in an inline or an inside-delta circuit.
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.
Functions
8.4 Motor protection
SIRIUS 3RW51 Soft Starter
96
Equipment Manual, 09/2020, A5E37108631002A/RS-AC/003
Содержание SIRIUS 3RW51
Страница 8: ...Table of contents SIRIUS 3RW51 Soft Starter 8 Equipment Manual 09 2020 A5E37108631002A RS AC 003 ...
Страница 32: ...Description 3 10 Accessories SIRIUS 3RW51 Soft Starter 32 Equipment Manual 09 2020 A5E37108631002A RS AC 003 ...
Страница 128: ...Functions 8 12 3RW5 HMI High Feature SIRIUS 3RW51 Soft Starter 128 Equipment Manual 09 2020 A5E37108631002A RS AC 003 ...
Страница 166: ...Circuit diagrams 13 1 CAx data SIRIUS 3RW51 Soft Starter 166 Equipment Manual 09 2020 A5E37108631002A RS AC 003 ...
Страница 208: ...Glossary SIRIUS 3RW51 Soft Starter 208 Equipment Manual 09 2020 A5E37108631002A RS AC 003 ...
Страница 210: ...Index SIRIUS 3RW51 Soft Starter 210 Equipment Manual 09 2020 A5E37108631002A RS AC 003 ...