Datasheet 2A-12

Switchguard M3A and M23A Electric Point MachinesEmergency Hand Crank or Dual Control

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Benefits

Proven reliability and ruggedness

Complies with AREMA 12.2.1 and BS581

Integral switch and lock mechanism

Minimal projection below sleeper level (M3A is low profile)

Mount on either side of track — easy conversion with common components

Electrically-interlocked lock and detection — fast and simple adjustment for each blade

Gold-plated switch contacts for maximum reliability

Standard stroke of 152 mm

Two gear ratios (189:1 and 360:1) to suit supply voltage

Optional ac immunity

M3A MkII — emergency hand crank

M23A MkII — hand throw lever

Dependable and Robust

The M3A MkII and M23A MkII electric point machines are the dependable and rugged internally-locked point machines for non-trailable applications.

Proven Design and Value

The proven design of these point machines is the result of more than 40 years of development.

Components are shared between the 84M point machine and the M3A and M23A MkII point machines, reducing your costs by minimising spares holding.

Tough and Reliable

The robust cast base, heavy-duty motor and highly durable surface treatment make the M3A MkII and the M23A MkII particularly tough and reliable for years of trouble-free service.

M3A MkIIEmergency hand crank

Hand crank entry

Selector lever(motor or hand operation)

Hand throw lever

M23A MkIIDual control

www.rail-automation.com Datasheet 2A-12 Issue 6.0

Datasheet 2A-12 issue 6.0

Description

Use the M3A MkII and M23A MkII point machines for mainline or yard operation of single switches, double slip switches, catch points, swing nose crossings and crossovers.

Choose:•the M3A MkII when you need a

compact hand-crankable machine•the M23A MkII when you need dual

control

Both machines have compact overall dimensions, and mount on two sleepers.

Individual padlocked covers protect the motor and circuit controller compart-ments of both models, and the hand crank entry of the M3A MkII. The lever stands accept standard padlocks.

Indexing and Interlocking Options

M3A MkII — hand cranks can be indexed.

M23A MkII — the selector lever and the hand throw lever can be interlocked so that the mechanism and points are returned to their original position before the power drive can be re-engaged.

Control

For easier maintenance, all control is achieved via external switching (internal contactor models are no longer available).

Motors

Three types are available:•ac induction motor (capacitor start

and run) for longest lifetime•series-wound split-field motor for dc

use•permanent-magnet motor for

ac-immune use

See also:• Datasheet 2A-8 — Series 84M MkIII

Point Machine

• Datasheet 2H-1 — T21M Point Machine

Ordering

Please discuss your requirements with us prior to ordering.

Please specify:•motor details (voltage, ac or dc, ac

immunity)•gear ratio — 189:1 (standard) or

360:1 (low voltage applications)•configuration — see page 4•M3A MkII — indexing of hand crank if

required•the side (left or right; see below and

last page) for the selector and hand throw levers

If the side is not specified, the levers are fitted on the right (as shown throughout this datasheet). They can be converted to the other side during installation.

We can also design and supply the operating rodding, either individually or as a packaged kit.

1034

BLADE OPENING

152 STROKE

300

190

165

4 HOLES Ø23@ 51 CENTRES

DETECTION BARS

LOCK BAR

OPERATING BAR

TRACKGAUGE STRUCTURE GAUGE CLEARANCE

294

406

508

100

1034

BLADE OPENING

152 STROKE

300

190

165

4 HOLES Ø23@ 51 CENTRES

DETECTION BARS

LOCK BAR

OPERATING BAR AA

TRACKGAUGE STRUCTURE GAUGE CLEARANCE

294

406

508

100

Typical installation (M3A MkII shown)

M23A MkII showing levers fitted to right-hand side

Detection Switches(detection rods removed)

Datasheet 2A-12 Issue 6.0 www.rail-automation.com

Datasheet 2A-12 issue 6.0

74

159

255

67 67

275 55

71 32

135

19

51

356

1580

508

38 sq. (16 places)

29

(16

plac

es)

235

Drain plug in sump 3/8" bsp

CL

M23A side view

Datumtop of bearer

or tie plate

262

Datumtop of bearer or tie plate

M3A point machine gearbox

51 51 51 51 51 51

918

406 470

290240

290240

51

411

152

Trav

el

165 191

59

264

346 346

417

236

23 (16 places)

461

22.2522.22

76

* 152

76 * 152

411

CL

CL

M23A plan view

BC

BC

Detection bar datum adjacent switch open

Travel adjustment range

Lock bar datum adjacent switch open

Travel adjustment range152

**

This bar deleted on single detection machines

Note:• Dimensions marked * indicate travel adjustment range.• All connections and rod dimensions are the same on point machines style M3A and M23A.

• Dimensions marked ** indicate detection lug fixing within this distance

Gearbox height: • M3A MkII 262 mm • M23A MkII 356 mm

DimensionsM23A MkII shown.Both models are identical except for gearbox height.

Specifications

M3A MkII M23A MkII

Electrical

Voltage 110–120 Vac 110 Vdc 110–120 Vac 110 Vdc 24 Vdc

Motor type ac induction split field permanent magnet

ac induction split field permanent magnet

split field permanent magnet

Current See performance graphs overleaf

Mechanical

Gearbox ratio 189:1 189:1 or 360:1 360:1 189:1 360:1

Factory thrust settings

Min 3 kN, slip 5 kN

Max thrust adjustment

Slip 7.5 kN

Stroke Throw bar: 152 mmStandard lock bars and detection rods: 76 –152 mm setting range (special bars also available)

Sleeper spacing

508 mm to 660 mm

Weight including crate (50 kg)

375 kg typical 425 kg typical

Dimensions See figure belowOuter dimensions of shipping crate: 1880 mm x 1010 mm x 700 mm

Environmental Suitable for all non-freezing environments

Datasheet 2A-12 issue 6.0

Siemens Rail Automation Pty LtdABN 78 800 102 483Level 7, 380 Docklands Drive, Docklands, Victoria 3008, AustraliaT +61 1300 724 518 E rail-components.au@siemens.comW www.siemens.com.au/rail-components© 2014, Siemens Rail Automation Pty Ltd

Typical performance curves

Left-hand layout,adjacent pointnormally open

Right-hand layout,adjacent pointnormally open

Right-hand layout,adjacent point

normally closed

Left-hand layout,adjacent point

normally closed

Configurations

The graphs show the different point machine models’ ability to handle various loads; illustrated is the typical relationship between current draw (A), motoring time (s) and load force (kN). A polynomial trend line was used to get a smooth curve.

24 Vdc Permanent Magnet Motor (360:1)

Current

Time

Time (s)

Cu

rren

t (A

)

Force (kN)

CCCurC ntnrrenrr nCCCurCur ntntrrenrren

eeTiiimeimeeeTiTiii e

110 Vdc Permanent Magnet Motor (189:1) M23A

Current

Time

Time (s)

Cu

rren

t (A

)

Force (kN)

24 Vdc Split Field Motor (360:1)

Current

TimeTimmem

Cuuurreurree

Time (s)

Cu

rren

t (A

)

Force (kN)

110 Vac Induction Motor (189:1)

Time (s)

Cu

rren

t (A

)

Force (kN)

Current

Time

Force (kN)

Time (s)

Cu

rren

t (A

)

110 Vac Induction Motor (360:1)

Current

Time