Siemens SIRIUS 3RH Series, System Manual

Page: 649 / 786

SIRIUS 3RA28 function modules for mounting on 3RT2 contactors
7.2 Product description
SIRIUS Innovations
System Manual, 01/2011, A8E56203870002-03
649
7.2.4 3RA28 function modules
Function module for direct-on-line start (solid-state timing relays with semiconductor output/solid-state
time-delay auxiliary switches)
1 Timing relay attachment
2 Time range selector switch: Sets the time base (1 s, 10 s, 100 s)
3 Operating time adjustment switch: Sets the relative time (5 to 100%)
4 Mechanical plunger: Indicates the switching state of the contactor
5 Screw-type/spring-loaded
connections: The terminals are available as both screw-type and
spring-loaded connections.
Figure 7-2 Solid-state timing relay with semiconductor output/solid-state time-delay auxiliary
switches
Function module for star-delta (wye-delta) start
The function module for star-delta (wye-delta) start comprises a basic module with integrated
control logic and two coupling modules of the same type.
1 Basic module with integrated control logic
2 Coupling module
3 Coil control:
Basic module: Voltage measurement at the line contactor
Coupling module: Controls the contactor below
4 Ribbon cable: Electrical connection of modules
5 Slot for connecting cable: Routes the supply voltage and electrical interlock
6 Time range selector switch: Sets the time base (10 s, 30 s, 60 s)
7 Operating time adjustment switch: Sets the relative time (5 to 100%)
8 Mechanical plunger: Indicates the switching state of the contactor
Figure 7-3 Basic module and coupling modules for the contactor assembly for star-delta (wye-delta)
start