Functions
6.7 Substation monitoring
Motor
starter (3RK1308‑0**00‑0CP0)
Equipment Manual, 11/2019, A5E34821005002A/RS-AC/003
97
How the motor starter's device protection works is described below.
Shutting down the motor starter within the permissible current range
The motor starter switches off in the following cases:
●
The motor starter is too hot.
●
The CLASS 10 tripping characteristic for the maximum current setting has been
exceeded.
●
The relay protection characteristic in the case of 9 A and in the case of
12 A motor starters has been exceeded.
Wait at least three minutes after shutting down the motor starter. Then trigger a trip reset.
The motor starter is operable again.
Violation of the permissible current range
Switching elements may be damaged if the permissible current range (represented by the
vertical line in the graphic) is exceeded. The motor starter switches off. The "Current
measuring range overshot" message is issued. 9 A and 12 A motor starters switch off
without the support of the semiconductors. This is referred to as "hard switching" and is
output as a fault diagnosis.
To prevent response of the device protection, a motor's maximum starting current must not
be higher than the motor starter's max. permissible current range.
NOTICE
Violation of the permissible current range
Fail-safe motor starters are defective after overshoot of the permissible current range and
cannot be activated again.
Reactivation of non-fail-safe motor starters is possible. The service life of a non-fail-safe
motor starter is, however, limited.
