Configuration
6.3 Operating mechanism system / coil selection 3RT contactors and 3RH2 contactor relays
SIRIUS - SIRIUS 3RT Contactors/Contactor assemblies
78 Manual, 09/2017, A5E03656507120A/RS-AE/006
Resetting the remaining lifetime signal (RLT)
After changing a contact, you must note the following for resetting the remaining lifetime
signal:
The control supply voltage must be applied at A1 / A2 and the contactor must be switched off
Hold down the RESET button on the laterally mounted electronic module with a ball-point pen
or similar object, for approx. 2 s
Hold the RESET button until only the green "RLT" LED shows a light after the LED indicators
Use in rotor circuits of slip-ring motors
Note
Notes on the use of contactors with remaining lifetime signal (RLT)
For detecting contact erosion, a typical measuring parameter of the RLT function is
the
voltage over the main contacts of the contactor when switching off the contactor. However,
depending on slip, voltage values arise in the rotor circuits that are not suitable for evaluation
and that result in premature signaling of RLT.
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