8mm Forum: GS1200 : ESS mode Question

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Topic: GS1200 : ESS mode Question

Phil Murat
Jedi Master Film Handler

Posts: 671
From: Villeneuve St Georges, France
Registered: Dec 2015

posted February 06, 2018 11:49 AM

Hello GS1200 Fan's,

Once setted on ESS mode , the machine starts normaly when it get a Pulse signal.

When in stand by,means no sync pulse sent, the rear arm take-up spindle spins alone .....

Is it a normal situation ?

If yes, I don't see the needs for the rear spindle to run during stand by mode...

All informations welcome.
Thanks in advance

[ February 06, 2018, 11:27 PM: Message edited by: Phil Murat ]

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Renzo Dal Bo
Film Handler

Posts: 70
From: Mogliano Veneto, Italy
Registered: Dec 2016

posted February 06, 2018 01:17 PM

In stand by mode, the flywheel is not maintained in motion, as it happens in stop mode. So that the start of the projection is a tricky moment, full of stress for the film.
Maintaining the rear spindle in motion reduces the inertia at the start, and the slipping of the first ESS pulse signal with the current frame projected.
Furthermore the ESS control sistem acts only on the main motor speed, all the remain services have to be ready to work before the start.

[ February 06, 2018, 03:52 PM: Message edited by: Renzo Dal Bo ]

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Phil Murat
Jedi Master Film Handler

Posts: 671
From: Villeneuve St Georges, France
Registered: Dec 2015

posted February 06, 2018 11:31 PM

Thanks Renzo, This is clarifying this particular point.

I understand too there is a normal time lag for approx three frames at start (ESS Mode). This is to prevent from "unwanted" start in case of wrong pulse coming into.

Do you confirm ?

[ February 07, 2018, 05:55 AM: Message edited by: Phil Murat ]

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Renzo Dal Bo
Film Handler

Posts: 70
From: Mogliano Veneto, Italy
Registered: Dec 2016

posted February 07, 2018 08:39 AM

Three frames correspond more or less to 1/10 of a second. I think this is the time the projector takes to accelerate from 0 up to reach 24 fps.

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