Operation Of A Motor In Two Directions Of Rotation (Reversing Contactor Assembly) - Siemens SIRIUS 3RT Manual

Configuration

6.12 Operation of a motor in two directions of rotation (reversing contactor assembly)

6.12 Operation of a motor in two directions of rotation (reversing
contactor assembly)
Applications
A reversing contactor assembly is used to operate a motor in two directions of rotation. The
starting characteristics correspond to those of a direct-on-line starter. When used in
conjunction with the relevant protective devices, they facilitate the space-saving and
compact assembly of fused and fuseless feeders.
On contactor assemblies with AC operation, 50/60 Hz, a changeover delay of 50 ms must be
provided at voltages ≥ 500 V. At voltages ≥ 400 V, a changeover delay of 30 ms is
recommended. These idle times do not apply to combinations with DC operation.
Variants and rated powers
The reversing contactor assemblies are available with a uniform power range of
3 kW to 250 kW (utilization category AC-3).
The reversing contactor assemblies of sizes S00 to S3 are available in two versions:
● Fully wired and tested with electrical and mechanical interlock
● Kit for self-assembly
Reversing contactor assemblies of sizes S6 to S12:
● Wiring kit for self-assembly
Reversing contactor assemblies of sizes S00 to S3:
For simplified connection to the controller, the SIRIUS modular system offers 3RA27 function
modules with versions for connection via AS-Interface or IO-Link. In this case, the first
contactor must be fitted with voltage tapping (special contactor version).
The diagram below shows the fully mounted 3RA23 reversing contactor assembly size S0
with a screw-type connection system.
Figure 6-2
140
Reversing contactor assembly with screw-type connection system (size S0)
SIRIUS - SIRIUS 3RT Contactors/Contactor assemblies
Manual, 09/2017, A5E03656507120A/RS-AE/006