Datasheet 2A-12
Switchguard M3A and M23A Electric Point MachinesEmergency Hand Crank or Dual Control
www.siemens.com.au/rail-components
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 [email protected] 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