Upper/Lower Current Warning Limit; Upper/Lower Current Limit - Siemens SIMATIC ET 200SP Manual

3.7.7.2

Upper/lower current warning limit

You can enter an upper and/or a lower current warning limit value. If the current warning
values are exceeded or undershot, the motor starter responds with a warning message
without tripping. The warning message is acknowledged as soon as the warning threshold is
exceeded or undershot by 5 %.
Note
The current warning thresholds are activated by default. You can deactivate the current
warning thresholds, however. The current warning thresholds are not activated until the
CLASS time expires.
Setting ranges
The table below shows the possible setting range for the lower and upper current warning
limits:
Device parameters
Lower current warning limit
Upper current warning limit
3.7.7.3

Upper/lower current limit

You can enter an upper and/or a lower current limit. The current limits are deactivated by
default. If the current limits are overshot or undershot, the motor starter responds by tripping.
The "I
current exceeds the maximum rated operational current by a factor of ten, the motor starter
shuts down the motor even if the current limit values are deactivated. An entry in the logbook
(data set 73 (Page 122)) is generated.
Example
The following example shows an application for the upper and lower current limit:
● The viscosity of the mixed mass is too high, that is, the upper current limit has been
overshot.
● "No load because drive belt is broken", that is, the lower current limit has been violated.
Note
The parameterized current warning thresholds are not activated until the CLASS time
expires.
Motor starter (3RK1308-0**00-0CP0)
Manual, 12/2016, A5E34821005002A/RS-AB/002
upper limit value violation" or "I
e
Default setting
21.875 %
112.5 %
lower limit value violation" message is issued. If the
e
Product overview
3.7 Functions
Setting range
18.75 ... 100 % of I
•
e
0 % (= deactivated)
•
Increment: 3.125 %
50 to 400 % of I
•
e
0 % (= deactivated)
•
Increment: 3.125 %
55