2/73 Contactors and Contactor Assemblies Contactor Assemblies for Switching Motors SIRIUS Contactor assemblies for WYE-delta starting WYE-delta starting can only be used either if the motor normally operates in a d (delta) connec- tion or starts softly or if the load torque during * starting is low and does not increase sharply. On the *step the motors can carry approximately 50 % (class KL 16) or 30 % (class KL 10) of their rated torque; the starting torque is approximately 1 / 3 of that during direct on-line start- ing. The starting current is approximately 2 to 2.7 times the rated motor current. The changeover from * to d must not be effected until the motor has run up to rated speed. Drives which require this changeover to be performed earlier are unsuitable for WYE- delta starting. The ratings given in the above table are only applicable to mo- tors with a starting current ratio of I A ≤8.4 × I N and using either a 3RT19 16-2G or 3RT19 26-2G solid-state time-delay auxiliary switch block with a WYE-delta function or a 3RP1574 WYE- delta time-delay relay with a dead interval of approximately 50 ms on reversing. For the circuit diagrams for the main and control circuits, see page 2/161. The size selected for the installation kits for WYE- delta starting is determined by the line contactor. Components for customer as- sembly Installation kits with wiring con- nectors and, if necessary, mechanical connectors are available for contactor assem- blies for WYE-delta starting. Contactors, overload relays, star-delta time-delay relays and auxiliary switches for the elec- trical interlock – if required also feeder terminals, mechanical interlocks 1 ) and baseplates – must be ordered separately. The wiring installation kits for sizes S00 and S0 contain the top and bottom main conduct- ing path connections between the line and delta contactors (top) and between the delta and WYE contactors (bottom). In the case of sizes S2 to S12 only the bottom main conduct- ing path connection between the delta and WYE contactors is included in the wiring connec- tor, owing to the larger conduc- tor cross-section at the infeed. Motor protection Overload relays or thermistor motor protection tripping units can be used for overload pro- tection. The overload relay can be ei- ther mounted onto the line con- tactor or separately fitted. It must be set to 0.58 times the rated motor current. Sizes S00 to S3 All contactor assemblies can be fitted with RC elements, varistors or diode assemblies for damping opening surges in the coil. As with the individual contac- tors, the surge suppressors can either be plugged onto the top of the contactors (S00) or fitted onto the coil terminals on the top or bottom (S0 to S3). Sizes S6 to S12 The contactors are fitted with varistors as standard. Application Design Surge suppression 1) Exception: The mechanical interlock between the delta and WYE contactors is included in the installation kit for size S00 contactor assemblies. Siemens Industry, Inc. Industrial Controls Catalog
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2/73
Contactors and Contactor AssembliesContactor Assemblies for Switching MotorsSIRIUS
WYE-delta starting can only be used either if the motor normally operates in a d (delta) connec-tion or starts softly or if the load torque during * starting is low and does not increase sharply. On the *step the motors can carry approximately 50% (class KL 16) or 30% (class KL 10) of their rated torque; the starting torque is approximately 1/3 of that during direct on-line start-ing. The starting current is approximately 2 to 2.7 times the rated motor current.
The changeover from * to dmust not be effected until the motor has run up to rated speed. Drives which require this changeover to be performed earlier are unsuitable for WYE-delta starting.
The ratings given in the above table are only applicable to mo-tors with a starting current ratio of IA ≤8.4 × IN and using either a 3RT19 16-2G or 3RT19 26-2G solid-state time-delay auxiliary switch block with a WYE-delta function or a 3RP1574 WYE-delta time-delay relay with a dead interval of approximately 50 ms on reversing.For the circuit diagrams for the main and control circuits, see page 2/161. The size selected for the installation kits for WYE-delta starting is determined by the line contactor.
Components for customer as-semblyInstallation kits with wiring con-nectors and, if necessary, mechanical connectors are available for contactor assem-blies for WYE-delta starting. Contactors, overload relays, star-delta time-delay relays and auxiliary switches for the elec-trical interlock – if required also feeder terminals, mechanical interlocks 1) and baseplates – must be ordered separately.The wiring installation kits for sizes S00 and S0 contain the top and bottom main conduct-ing path connections between the line and delta contactors (top) and between the delta and WYE contactors (bottom).In the case of sizes S2 to S12 only the bottom main conduct-ing path connection between the delta and WYE contactors is included in the wiring connec-tor, owing to the larger conduc-tor cross-section at the infeed.
Motor protection
Overload relays or thermistor motor protection tripping units can be used for overload pro-tection.The overload relay can be ei-ther mounted onto the line con-tactor or separately fitted. It must be set to 0.58 times the rated motor current.
Sizes S00 to S3
All contactor assemblies can be fitted with RC elements, varistors or diode assemblies for damping opening surges in the coil.
As with the individual contac-tors, the surge suppressors can either be plugged onto the top of the contactors (S00) or fitted onto the coil terminals on the top or bottom (S0 to S3).
Sizes S6 to S12
The contactors are fitted with varistors as standard.
Application Design
Surge suppression
1) Exception:The mechanical interlock between the delta and WYE contactors is included in the installation kit for size S00 contactor assemblies.
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Contactor assembliesfor WYE-delta starting
Contactors and Contactor AssembliesContactor Assemblies for Switching Motors SIRIUS
For accessories, see page 2/50.For circuit diagrams, see page 2/162.
1) The installation kit contains mechanical inter-lock; 3 connecting clips; wiring connectors on the top (connection between line contactor and delta contactor) and the bottom (connection between delta contactor and star contactor); WYE jumper.
2) The installation kit contains 5 connecting clips; wiring connectors on the top (connection between line contactor and delta contactor) and the bottom (connection between delta contactor and WYE contactor); star jumper.
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Contactors and Contactor AssembliesContactor Assemblies for Switching MotorsSIRIUS
3) Installation kit contains wiring connector on the bottom (connection between delta contactor and WYE contactor) and WYE jumper.
4) Wiring connector on top from reversing contac-tor assembly (note conductor cross-sections).
5) A mechanical interlock adapter, 3RA1954-2C, is required to use the standard 3RA1954-2A mechanical interlock for the AC version of the S6-S6-S3 WYE-Delta starter. The S6-S6-S3 WYE-Delta DC version would require a special custom build spacer, which is not manufac-
tured, to allow the mechanical interlock tooperate.
6) Only use wiring connector on the top from reversing contactor assembly (note conductor cross-sections); order WYE jumper in addition.
Push-in lug 2) for time-delay relay for screw mounting 3RP19 03 Section 9
Components Order No. PageK1 K3 K2
Contactors,
25 A, 15 HP 3RT10 24 3RT10 24 3RT1024 2/8
Contactors,30/40 A, 20/25 HP 3RT10 26 3RT10 26 3RT1024 2/8
Time-delay relay,laterally mountable 3RP15 74-1N.30 Sec. 9
Auxiliary switch block with one unassignedNO contact 3RH19 21-1CA10 2/36
Auxiliary switch block for local control2 units 3RH19 21-1CA013 units 3RH19 21-1CA10 2/36
Installation kit 3RA19 23-2B 2/50
The installation kit contains:
Connecting clips
Wiring connectors on the top and bottom for connecting the main conducting paths
4
7
12
15
16
17
18
19
1 2 3
1 2 3
8
9
10
5 6
5
6
For overview, see page 2/73-74.For accessories, see page 2/50.For circuit diagrams, see page 2/162.
1) Not included in scope of supply of complete contactor assemblies; available as accessory.
2) Possible in principle.If a solid-state time-delay auxiliary switch block is mounted onto the front of K3, an ordinary auxiliary switch block can only be mounted onto the side.
Inc.talog
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Contactor assembliesfor WYE-delta starting
Contactors and Contactor AssembliesContactor Assemblies for Switching Motors SIRIUS
Push-in lug 2) for time-delay relay for screw mounting 3RP19 03 Section 9
Components Order No. PageK1 K3 K2
Contactors,50/60 A, 30 HP 3RT10 34 3RT10 34 3RT1026 2/8
Time-delay relay,laterally mountable 3RP15 74-1N.30 Sec. 9
Auxiliary switch block with one unassignedNO contact 3RH19 21-1CA10 2/36
Auxiliary switch block for local control2 units 3RH19 21-1CA013 units 3RH19 21-1CA10 2/36
Baseplate 3RA19 32-2E 2/50
Installation kit 3RA19 33-2C 2/50
The installation kit contains the WYE jumper on the top and the wiring jumper on the bottom for connecting the main conducting paths.
4
7
15
16
17
18
19
1 2 3
8
10
11
6
9
For overview, see page 2/73-74.For accessories, see page 2/50.For circuit diagrams, see page 2/162.
1) Not included in scope of supply of complete contactor assemblies; available as accessory.
2) Possible in principle.If a solid-state time-delay auxiliary switch block is mounted onto the front of K3, an ordinary auxiliary switch block can only be mounted onto the side.
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Mechanical interlock, lateral3RA19 24-2B 2/47Solid-state time-delay auxiliary switch block, mountable on the front 3RT19 26-2G... 2/39Mechanical interlock,mountable on the front 3RA19 24-1A 2/39Auxiliary switch block,
80 A, 50 HP 3RT10 35 3RT10 35 3RT1034 2/8Contactors,
86 A, 60 HP 3RT10 36 3RT10 36 3RT1034 2/8Time-delay relay,lateral 3RP1574-1N.30 Sec. 9Auxiliary switch block with one unassignedNO contact 3RH19 21-1CA10 2/36Auxiliary switch block for local control2 units 3RH19 21-1CA013 units 3RH19 21-1CA10 2/36Baseplate 3RA19 32-2F 2/50Installation kit 3RA19 33-2B 2/50The installation kit contains the WYE jumper on top and the wiring jumper on bottom for connecting the main con-ducting paths.
47
12
15
16
171819
1 2 3
1 2 3
8
9
10
11
6
For overview, see page 2/73-74.For accessories, see page 2/50.For circuit diagrams, see page 2/162.
1) Not included in scope of supply of complete contactor assemblies; available as accessory.
2) Possible in principle. If a solid-state time-delay auxiliary switch block is mounted onto the front of K3, a standard auxiliary switch block can only be mounted onto the side.
Inc.talog
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Contactor assembliesfor WYE-delta starting
Contactors and Contactor AssembliesContactor Assemblies for Switching Motors SIRIUS
Mechanical interlock, lateral, depth must be adapted K3: 0 mm; K2: 27.5 mm 3RA19 24-2B 2/47Solid-state time-delay auxilary switch block, mountable on the front 3RT19 26-2G... 2/39Auxiliary switch block, lateral3RH19 21-1EA.. 2/37Surge suppressor 3RT19 . 6-1.... 2/42Push-in lug 2) for time-delay relayfor screw mounting 3RP19 03 Section 9
Components Order No. PageK1 K3 K2
Contactors,
115 A, 75 HP 3RT10 44 3RT10 44 3RT1035 2/8Contactors,
150 A, 100 HP 3RT10 45 3RT10 45 3RT1036 2/8Time-delay relay, lateral 3RP15 74-1N.30 Sec. 9Auxiliary switch block with one unassignedNO contact 3RH19 21-1CA10 2/36Auxiliary switch block for local control2 units 3RH19 21-1CA013 units 3RH19 21-1CA10 2/36Baseplate 3RA19 42-2E 2/50Installation kit 3RA19 43-2C 2/50
The installation kit contains the WYE jumper on the top and the wir-ing jumper on the bottom for connecting the main conducting
4
7
151619
1 2 3
1 2 3
8
9
10
116
For overview, see page 2/73-74.For accessories, see page 2/50.For circuit diagrams, see page 2/162.
1) Not included in scope of supply of the completecontactor assemblies; available as an accessory.
2) Possible in principle.If a solid-state time-delay aux-iliary switch block is mounted onto the front of K3, a standard auxiliary switch block can only be mounted onto the side.