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Post by russe on Mar 28, 2007 21:35:41 GMT
When a vehicle's main passenger compartment lights go out (which seems to me to be far less frequent an occurence than it once was), is there always a correlation with the dropout and the set/vehicle being gapped? I suspect not, but I thought I'd ask.
Russ
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towerman
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Posts: 2,886
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Post by towerman on Mar 28, 2007 22:44:39 GMT
On older stocks,if a car goes "off juice" the MA will drop out and you will lose main lighting,emergency lights(fed from batteries)will stay on.95 & 96 TS have a through lighting bus line,so as long as one invertor on the train is receiving traction current,all car lights will stay on.
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Post by edb on Mar 29, 2007 6:40:36 GMT
I've often noticed that one side go out and then the other goes out as the first comes back on (make sense?)
Is this due to the fact juice for one side of the unit lighting is picked up by the DM and the other side picked up the the UDM?
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solidbond
Staff Emeritus
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Post by solidbond on Mar 29, 2007 6:58:01 GMT
I've often noticed that one side go out and then the other goes out as the first comes back on (make sense?) Is this due to the fact juice for one side of the unit lighting is picked up by the DM and the other side picked up the the UDM? That is indeed the case on D stock - it was also the case on the 83's but I'm not sure about other stocks (ie 73s or 92s) |
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Post by tubeprune on Mar 29, 2007 16:27:14 GMT
73s are the same as Ds. A Stock and 67/72s also have MA feeding along one side of a unit since refurb. 92s have a static converter which feeds lighting on one unit complete. C Stock has the MA feeding all the lights on the unit.
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Post by russe on Mar 29, 2007 17:44:27 GMT
To clarify, what are 'MA', 'DM' (driving motor?) and 'UDM'?
Russ
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Deleted
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Post by Deleted on Mar 29, 2007 17:50:30 GMT
MA - Motor Alternator
DM - Driving Motor
UDM - Uncoupling non-Driving Motor (aka 'UNDM')
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solidbond
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Post by solidbond on Mar 29, 2007 18:05:06 GMT
MA - Motor Alternator DM - Driving Motor UDM - Uncoupling non-Driving Motor (aka 'UNDM') To be totally pedantic, a UDM is an Uncoupling Driving Motor (as in the double-ended D stocks - ie there is a full auto coupler) The Uncoupling Non Driving Motor car is the UNDM  ;D |
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Post by russe on Mar 30, 2007 14:39:37 GMT
Sorry for my ignorance again, but what in layman's terms is the meaning of 'uncoupling' in the context of driving motor and non-driving motor?
Russ
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Oracle
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Post by Oracle on Mar 30, 2007 15:05:39 GMT
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Deleted
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Post by Deleted on Mar 30, 2007 15:43:03 GMT
UNDM - it can be uncoupled, has motors, but no driving compartment
UDM - can be uncoupled, has motors and may have a driving compartment or a shunt cabinet [small version of a cab with just basic controls and no amenities a full cab has]
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solidbond
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'Give me 118 reasons for an Audible Warning on a C Stock'
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Post by solidbond on Mar 30, 2007 16:16:24 GMT
UNDM - it can be uncoupled, has motors, but no driving compartment UDM - can be uncoupled, has motors and may have a driving compartment or a shunt cabinet [small version of a cab with just basic controls and no amenities a full cab has] For D stock, the definition is, Uncoupling - has the ability to be coupled at the middle of a train, ie has a full auto-coupler. Thus Uncoupling Non-Driving Motor - has a shunting position to allow uncoupling to take place, but is Non-Driving as there is not a full cab. Uncoupling Driving Motor - Double ended unit of D stock, as it has a full auto-coupler and can be in the middle of the train, but also has a full cab. (A standard Driving Motor car only has an emergency coupler, ie a single ended unit) As a point of interest, the C stock trailer car is officially an Uncoupling Trailer car as it has a full auto-coupler and shunting cabinet |
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;D
