Siemens SIRIUS 3RW55 - Page 111

Functions
7.4 Motor protection
SIRIUS 3RW55 soft starter
Manual, 08/2018, A5E35630887002A/RS-AB/002
111
Parameters
Description
Remaining time for tripping
warning limit
The 3RW55 soft starter warns about imminent motor overload tripping
within the set time if the present operating conditions are retained. The
parameter value "0" deactivates the function.
• Factory setting: 0 s
• Setting range: 0 ... 500 s
• Increment: 1 s
Motor heating warning limit You use this parameter to p
reset a motor heating value in percent as a
warning limit. The parameter value "0" deactivates the function.
• Factory setting: 0%
• Setting range: 0 ... 99%
• Increment: 1%
Non-volatile tripping status If the non-volatile tripping status is activated, and the control supply
voltage fails during a trip, the current tripping state of the motor
over
load protection and the current recovery time are stored in the soft
starter.
•
Yes
(factory setting)
•
No
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.
Tripping class
The tripping class (CLASS) specifies the maximum time within which a protective device
must trip from a cold state at 7.2 x the rated operational current (motor protection to
IEC 60947). The tripping class defines the starting time at a particular current before the trip
occurs.
You can set different tripping characteristics according to the startup class. The higher the
class, the longer the permitted starting time.
You can find the graphic for the respective tripping characteristic under this link
(https://support.industry.siemens.com/cs/ww/en/ps/25100/char).