Siemens SIRIUS 3RT Manual page 79

6.3 Operating mechanism system / coil selection 3RT contactors and 3RH2 contactor relays
Residual current via the main contacts
The resistance of the individual measuring circuits via the main contacts is 4.8 Mohms per
current path. This high-resistance value excludes dangerous body currents or touch voltages
on the load side when the contactor is switched off.
Functional switching via A1/A2
Functional switching via A1/A2 results in signaling of RLT. The control inputs (PLC) must be
used for this. The system circuits are an exception here; the measured values remain saved
(E²PROM). The control inputs via PLC/AS-Interface must be used for functional switching.
①
②
③
④
Connector for inputs/outputs (7--pin)
⑤
⑥
⑦
⑧
On the versions with remaining lifetime signal RLT, the entire electronic part is
accommodated in the laterally mounted electronic module. The withdrawable part contains
only the solenoid coil. It is connected via the cables run out of the laterally mounted
electronic module using flat connectors to avoid confusion with other coils when changing
coils. The cables connected on the input and output sides of the main current paths are for
detecting the remaining lifetime signal RLT.
SIRIUS - SIRIUS 3RT Contactors/Contactor assemblies
Manual, 09/2017, A5E03656507120A/RS-AE/006
Terminals A1/A2 for supply voltage
LED displays: Contactor ON
LED displays: RLT display
60 % (green)
•
40 % (orange)
•
20 % (red)
•
Reset button for RLT
PLC relay input H1/H2
Not used
RLT relay output R1/R2
PLC input 24 V DC, IN+/IN
Configuration
79