Overload Protection Function - Siemens SIRIUS 3RA6 System Manual

3RA64/3RA65 compact starter with IO-Link
6.6 Functions
6.6.2

Overload protection function

Overload protection function, phase loss protection
The compact starter protects three-phase motors against overload. In addition, the compact
starter is provided with phase loss protection to prevent excessive heating of the load in
single phasing if phase loss occurs. In both cases, the compact starter switches off without
opening the breaker latching mechanism.
When operating with single-phase loads, the phase loss protection must be compensated to
prevent premature tripping. This is done by selecting the setting current on the compact
starter higher than the operating current I
Operator controls
The following operator elements are available to you on the compact starter to guarantee
optimal overload protection:
● "Current setting I
"Setting current I
● "Manual/auto reset" selector switch: Use the "Manual/auto reset selector switch" to
determine how the compact starter is reset after an overload trip.
– Manual reset "M": You must reset the compact starter manually by:
– sending the control command "Trip Reset" via IO-Link (value change from 0 to 1 or
– pressing the "Reset" button on the operator panel ("Operator panel for 3RA64/3RA65
– pressing the blue Reset button.
– Auto reset "A": The compact starter resets itself autonomously after approximately 3
● "Overload trip class" selector switch: For selecting trip CLASS 10E or CLASS 20E.
122
" setting wheel: Set the rated operating current of the load on the
e
" setting wheel.
e
from 1 to 0).
compact starter with IO-Link (Page 240)".).
minutes. If an ON command is present via IO-Link from this point, the compact starter
switches on again. Manual reset is possible at any time in this setting.
WARNING
Automatic machine restart!
If an ON command via an IO-Link is present after an overload trip and a manual
reset or auto reset is performed, the machine will start up immediately. People may
be injured if they stay in the danger area of the machine.
Make sure that the danger area of the machine is kept clear of people.
of the motor by a factor of 1.6.
e
System Manual, 08/2018, NEB560060102000/RS-AB/007
SIRIUS 3RA6 compact starter