[PRCo] Re: Pantographs__&&__Interior__Lighting

[Greg King]

Hi Jim,

For a start, the Faiveley panto is a brand name but synonymous with the "one
arm" panto to which you refer as they were the first (or the first
successful type).

The bouncing you refer to also happens with our Austbrek type one arm
pantos, what happens mostly is, when they go under frog pans of joint
trolley pole panto operation, at speed they bounce when they hit the frog,
momentarilly loosing contact with wire. Where the trolley has been modified
for panto only (route 109) with new overhead, this has been eliminated.

The panot will also bounce on slack overhead, especially in summer when the
wire sags, this is particular noticable on simple span and hanger fittings
(again trolley pole) and the wire is high, at speed, the panto cannot raise
quickly enough for the sudden peak at the hanger and shoots straight across
(we are talking a couple of inches here), where the over head has been
replaced with suspended hangers (Kuhmler and Matter type), this does not
happen, also, on out LRT lines that were once heavy rail, the simple over
head at the start at the St. Kilda end, does this, but a few hundred metres
in, the catenary starts from when the line was heavy rail (similar o/h to
North Shore)  and the pan is smooth as silk.

The bottom line is, the pan is not as responsive to height fluctuations as
the trolley pole is.

Hope this helped Jim,

Greg in Oz
----- Original Message -----
From: "Jim Holland" <pghpcc at pacbell.net>
Sent: Monday, June 24, 2002 6:30 PM
Subject: [PRCo] Pantographs__&&__Interior__Lighting


>
> Good Morning!
>
> Faiveley pantographs (believe this is the correct term for half-diamond
> pantographs) sometimes bounce along the overhead v\for various reasons.
>
> Besides cutting power for traction motors temporarily on modern lrvs, the
> interior lights will go out momentarily as well.   Several banks of lights
-- Trailing quotes stripped by Listar --