Upper/Lower Current Limit - Siemens 3RK1308‑0 00‑0CP0 Series Equipment Manual

Functions
6.7 Substation monitoring
6.7.3

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 182)) 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. In other words, the lower current limit has been
violated.
Note
The parameterized 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 limit
Upper current limit
94
upper limit value violation" or "I
e
lower limit value violation" message is issued. If the
e
Default setting
Deactivated
•
•
Increment: 3.125 %
Deactivated
•
•
Increment: 3.125 %
Equipment Manual, 11/2019, A5E34821005002A/RS-AC/003
Setting range
18.75 ... 100 % of I
e
0 % (= deactivated)
50 to 400 % of I
e
0 % (= deactivated)
Motor starter (3RK1308‑0**00‑0CP0)