Diesel-Electric Locomotive SD90MACwith Three-Phase Drive

The SD90MAC’s are the perfect multi-purpose locomotives providing highstarting and continuous tractive effortsas well as high speeds. Therefore allareas of operation can be covered.

This is possible by using modern threephase AC technology:• Pulse-width modulated (PWM)

inverters with GTO thyristors usingevaporation cooling proven inthousands of applications

• Induction traction motors in axle-hung, nose-suspended design

• SIBAS® 16 microcomputer tractioncontrol

Development and manufacturing:Siemens AG Erlangen, Germanyand Electro-Motive Division of General Motors Corp. (EMD)

The locomotive can be equipped with4 300 THP engine or with the fourstroke ”H“ engine with 6 000 THP.Data with 6 000 THP engine are givenin brackets.Wheel arrangement Co’Co’ 0-6-6-0

Track gauge 1435 mm 4 ft 8.5 in

Weight 190.5 t 420 000 lbs

Length over couplers 24 434 mm 80 ft 2 in

Wheel diameter 1118 mm 44 in

Gear ratio 83 :16 5.19 : 1

Maximum speed 128 km/h 80 mph

Diesel engineType EMD 16-710 G3BRating 4 300 HP/3 208 kW at 950 rpm

Diesel engineType EMD H-engineRating 6 000 HP/4 476 kW at 1000 rpm

Starting tractive effort 820 kN (890 kN) 185 000 lbs (200 000 lbs)

Continuous tractive effort 654 kN (734 kN) 147 000 lbs (165 000 lbs)

Braking effort 510 kN 115 000 lbs

Te c h n i c a l I n f o r m a t i o n

4-7 2,3 1 8

9

4-7 2,3 1 8

�

1 Diesel engine2 Generator3 Rectifier4 Traction converter

cubicle5 PWM inverter6 DC link capacitor7 Braking contactor8 Braking resistor9 Traction motor �

Generalview

Main circuit diagram

Speed [km/h]

Tractive effort

Braking effort

Tra

cti

ve

/ B

rak

ing

eff

ort

[k

N]

Tractive effort

Braking effort

Tra

cti

ve

/ B

rak

ing

eff

ort

[k

N]

Speed [km/h]

Tractive and braking effort diagrams

SD90MAC with 4 300 HP SD90MAC with 6 000 HP

Driving

Braking

Direction

Multipli-unittraction

Dieselengine

Central control unit

Dieselengine

Generator

Auxiliaries

Diagnostics

G3~

Tractioninverter

M3~

M3~

M3~

Traction control unitSIBAS 16

Traction controlSlip and slide controlInverter protectionDiagnostics

M3~

M3~

M3~

Traction control unitSIBAS 16

Traction controlSlip and slide controlInverter protectionDiagnostics

Tractioninverter

Locomotive and traction control

The control system of the entire loco-motive is based on microcomputertechnology. It comprises a SIBAS® 16traction control unit for each inverterand a locomotive control unit. Thiscontrol unit processes the commandscoming from the driver or trainlines toform the reference values for tractioncontrol.

Traction converter

The traction converter cabinet containsthe following components:• 6 GTO phase modules including gate

drive units• 12 MP capacitors (6 per DC link)• 2 sets of current and voltage

transformers• 2 snubber resistors• 1 fan• 2 SIBAS® 16 traction control units

Each phase module contains thepower semiconductors for oneinverter phase (two GTO thyristors 4.5 kV/3.0 kA and two antiparalleldiodes) as well as the snubber circuitdiodes and capacitors. The GTO gatedrive units are mounted outside on the module cover.

The heat losses of the electricalcomponents arranged in the moduleare dissipated by evaporation bathcooling, a method long proven in railvehicles.

The traction control units are housedin a separate compartment within theconverter cabinet.

Doors and hatches provided in thecabinet affort easy and direct accessto all components.

Siemens Aktiengesellschaft Order No. A19100-V600-B632-X-7600Printed in Germany141D6296 176140 DB 10001.Subject to change without prior notice

Siemens AGTransportation Systems GroupLocomotivesP.O. Box 32 40D-91050 Erlangen

SIBAS® 16 traction control unit

The inverter for each truck is con-trolled by a traction control unit whichcontains the microcomputers, I/Omodules as well as the necessarypower supplies. The control unitperforms such functions as tractioncontrol, wheelslip control, inverterprotection and diagnostics. A data buswith RS485 compatibility is providedfor a transmission of data between the traction control units and the loco-motive control unit.

Traction motor 1TB2830

The four-pole squirrel-cage three-phase induction motor is designedspecifically for use on locomotiveswith heavy axle loads.

The stator is of laminated frameconstruction with no housing. Thelamination is held together by sturdy

Starting torque 16 300 Nm12 009 lbft

Continuous torque 12 900 Nm9 504 lbft

Continuous rating 638 kW

Maximum voltage 2 183 V

Maximum speed 3 435 rpm

end plates and welded tie rods. Theforced-ventilated motor is designed foraxle-hung roller-bearing installation.

The stator winding is insulated accord-ing to insulation class H.

The traction motor is designed bySiemens AG and manufactured underlicense by General Motors of CanadaLtd. Diesel Division.

Reg. No. 2234

M o b i l i t y for a moving world.Siemens Transportation Systems