1471233 ENGINE AR-PRIMARY Caterpillar parts
236, 247, 267
Rating:
Alternative (cross code) number:
CA1471233
147-1233
1471233
CA1471233
147-1233
1471233
Weight: 532 pounds 241 kg.
MULTI TERRAIN LOADER, SKID STEER LOADER,
Related part:
1471233
ENGINE AR-PRIM
10R4532
R
Compatible equipment models: 1471233:
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Information:
CONFIDENTIAL
TECHNICAL INFORMATION BULLETIN May 08, 2002
Generators SR4B (2DN1-1562, 2ED1-1770,
2FN1-1584, 2HN1-610, 2SN1-
701, 3FN1-1122, 5SN1-745,
5VA1-820, 5YA1-1201, 5ZA1-
775, 6DW1-1269, 6LA1-874,
6SA1-2391, 8FD1-749, 8NN1-
1034, 8XS1-522, 8ZD1-890,
9CN1-590, AAD1-502
Component Code: 1404SUBJECT: 5kV Class Droop Current Transformer (CT) that Is Installed on Certain SR4B Generators May Not Operate as Designed
PROBLEM:
The factory-installed droop CT's on certain 2400 volt through 4160 volt (medium voltage) SR4B generators may be marginal in VA size. SR4B generators that are marginal in VA size may begin to saturate at full generator load or may begin to saturate at near-full generator load. Caterpillar voltage regulator (VR) droop circuits that are used on SR4B generators utilize a 5 ampere secondary CT output that is converted to 5 volts across the 1 ohm droop resistor. This may result in the following:
An inaccurate reactive VAR when paralleling multiple generators
An imprecise PF (or VAR) stability when paralled to a utility source
SOLUTION:
Caterpillar has redesigned the droop circuit and removed the 123-6046 Resistor. In the medium-voltage SR4B generators, the 123-6046 Resistor has been replaced with a 204-3544 Current Transformer. The 5 kV CT's remain the same. The 204-3544 Current Transformer is mounted on the existing generator terminal DIN rail and is wired as follows:
Output wire 5 from the droop CT connects to the 204-3544 Current Transformer input terminal H1
Output wire 6 from the droop CT connects to the 204-3544 Current Transformer input terminal H2
Transformer output terminal X1 is wired to the existing generator terminal 5
Transformer output terminal X2 is wired to the existing generator terminal 6
From this point, the VR droop circuit wiring remains unchanged. The VR3 utilizes a 197-3531 Rheostat. The DVR and the VR6B are connected direct. See Illustration 1 for wiring details.
A parts kit (218-4827) will be available for the field retrofit for the 3500 product. The parts kit will include all of the components necessary to make the change-over as described above.
Utilization and set-up for reactive droop paralleling between generators is not affected by this change. Observe standard recommended proactices for proper cross-current compensation (CCC) wiring between the CT's. This change also does not affect the CCC operation.
Illustration 1. Wiring Diagram
COPYRIGHT 2002 CATERPILLAR
ALL RIGHTS RESERVED
TECHNICAL INFORMATION BULLETIN May 08, 2002
Generators SR4B (2DN1-1562, 2ED1-1770,
2FN1-1584, 2HN1-610, 2SN1-
701, 3FN1-1122, 5SN1-745,
5VA1-820, 5YA1-1201, 5ZA1-
775, 6DW1-1269, 6LA1-874,
6SA1-2391, 8FD1-749, 8NN1-
1034, 8XS1-522, 8ZD1-890,
9CN1-590, AAD1-502
Component Code: 1404SUBJECT: 5kV Class Droop Current Transformer (CT) that Is Installed on Certain SR4B Generators May Not Operate as Designed
PROBLEM:
The factory-installed droop CT's on certain 2400 volt through 4160 volt (medium voltage) SR4B generators may be marginal in VA size. SR4B generators that are marginal in VA size may begin to saturate at full generator load or may begin to saturate at near-full generator load. Caterpillar voltage regulator (VR) droop circuits that are used on SR4B generators utilize a 5 ampere secondary CT output that is converted to 5 volts across the 1 ohm droop resistor. This may result in the following:
An inaccurate reactive VAR when paralleling multiple generators
An imprecise PF (or VAR) stability when paralled to a utility source
SOLUTION:
Caterpillar has redesigned the droop circuit and removed the 123-6046 Resistor. In the medium-voltage SR4B generators, the 123-6046 Resistor has been replaced with a 204-3544 Current Transformer. The 5 kV CT's remain the same. The 204-3544 Current Transformer is mounted on the existing generator terminal DIN rail and is wired as follows:
Output wire 5 from the droop CT connects to the 204-3544 Current Transformer input terminal H1
Output wire 6 from the droop CT connects to the 204-3544 Current Transformer input terminal H2
Transformer output terminal X1 is wired to the existing generator terminal 5
Transformer output terminal X2 is wired to the existing generator terminal 6
From this point, the VR droop circuit wiring remains unchanged. The VR3 utilizes a 197-3531 Rheostat. The DVR and the VR6B are connected direct. See Illustration 1 for wiring details.
A parts kit (218-4827) will be available for the field retrofit for the 3500 product. The parts kit will include all of the components necessary to make the change-over as described above.
Utilization and set-up for reactive droop paralleling between generators is not affected by this change. Observe standard recommended proactices for proper cross-current compensation (CCC) wiring between the CT's. This change also does not affect the CCC operation.
Illustration 1. Wiring Diagram
COPYRIGHT 2002 CATERPILLAR
ALL RIGHTS RESERVED
Caterpillar SIS machinery equipment:
Caterpillar SIS
236, 246, 248 Skid Steer Loader 4YZ00001-03999 (MACHINE) POWERED BY 3034 Engine »
147-1233
ENGINE AR-PRIMARY
236 246 252 262 Skid Steer Loader 4YZ04000-UP (MACHINE) POWERED BY 3034 Engine »
147-1233
ENGINE AR-PRIMARY
267 277 Multi Terrain Loader CMP00001-UP (MACHINE) POWERED BY 3034 Engine »
147-1233
ENGINE AR-PRIMARY
247 257 Multi Terrain Loader CML00001-UP (MACHINE) POWERED BY 3034 Engine »
147-1233
ENGINE AR-PRIMARY
Caterpillar parts catalog:
Parts engine Caterpillar catalog:
1446194
ENGINE AR-PRIMARY
216, 247
216, 247
1599214
ENGINE AR-PRIMARY
236, 248
236, 248
1471234
ENGINE AR-PRIMARY
236, 267, 287
236, 267, 287
3194874
ENGINE AR-COMPLETE
C15, TH35-C15T
C15, TH35-C15T
9Y2554
ENGINE AR
3406B
3406B