Siemens SIMATIC ET 200pro Quick Manual page 151

10.4 Current limits
Description
The motor current and current limits can be used to draw conclusions regarding
various system states:
System becomes sluggish (e.g. due to
damaged bearings)
System runs more smoothly (e.g.
because there is no material left to pro-
cess).
System is blocked!
Motor running at no-load e.g. due to
system damage!
10.4.1 Device parameters
Response to residual current violation
(can be parameterized for standard and high feature motor starters)
The residual current detection reacts when motor current becomes lower than
18.75% of the rated operating current in all 3 phases.
This device parameter configures how the motor starter responds to residual
current detection:
• Warning
• Tripping
Caution
When the motor is switched on, the zero current detector is suppressed for
approximately 1 second!
Response to current limit violation
(can only be parameterized for high feature motor starters)
This device parameter configures how the motor starter responds to a current
limit violation:
• Warning
• Tripping
SIMATIC – ET 200pro motor starter
GWA 4NEB 950 5661-02 DS 04
System state Current value
Current is greater Current limits
or
less than normal
Very high current Blocking protection
flowing
Very low current Residual current
flowing detection
(< 18.75 % of I )
e
Protection by:
10-11