Functions
7.2 Overload protection function
SIRIUS 3RA6 Compact Starter
System Manual, 02/2008, GWA 4NEB 560 0601-02 DS 02
53
7.2 Overload protection function
Function
The compact starter protects three-phase motors against overload. Consequently, the
compact starter can shut down without the breaker latching mechanism having to open.
The compact starter is also equipped with phase failure protection in order to minimize
heating of the load in the event of a phase failure during single-phase operation.
For the purpose of the overload protection function, the rated current of the load is set using
the "current setting I
e
" setting wheel. The overload trip class can be set to CLASS 10 or
CLASS 20 directly on the device.
The "RESET M/A" (manual/automatic) selector switch allows you to select manual or auto
reset following an overload:
● Manual reset: Following an overload, the compact starter is reset manually using the blue
reset button.
● Auto reset: Following an overload, the compact starter is reset automatically after
3 minutes. However, a manual reset can still be performed if you have selected this
setting.
Display concept
The "Overload tripped" status is indicated by the following elements:
Table 7-6 Overload trip display elements (direct starter/reversing starter)
Mech. display
Actuator
TRIP
Compact starter status
READY
White display
Overload tripped
Function test
Use the "TEST " button to test the overload protection function ("overload protection
function" test button). The thermal motor model/overload protection function will not be
affected by this function test. Use the "Test
" button to switch the compact starter back on
following a shutdown.
Motor model
The electronics calculate the motor temperature continuously in accordance with the
operating time and current load and store this information in a thermal motor model.
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