Response To Residual Current Detection - Siemens 3RK1308‑0 00‑0CP0 Series Equipment Manual

6.7.1

Response to residual current detection

If the motor current drops to under 20% from the set operational current or below the
minimum load limit in one of the phases, residual current detection responds. You use this
device parameter to specify how the motor starter is to behave in the event of residual
current being detected:
● Warning (not in the case of fail-safe motor starters)
● Tripping
Note
When the motor is switched on, residual current detection is suppressed for approximately
1 s.
Residual current detection for motor starters with 0.1 ... 0.4 A
The following graphic shows the dependence of residual current detection on the set motor
current in the case of motor starters with 0.1 to 0.4 A:
Figure 6-9
Residual current detection for motor starters with 0.3 ... 1 A
The following graphic shows the dependence of residual current detection on the set motor
current in the case of motor starters with 0.3 to 1 A:
Figure 6-10
Motor starter (3RK1308‑0**00‑0CP0)
Equipment Manual, 11/2019, A5E34821005002A/RS-AC/003
Residual current detection 0.1-0.4 A device
Residual current detection 0.3-1 A device
Functions
6.7 Substation monitoring
89