Delta 5 (1986)
Zero 88
4 x 5A Dimmer Pack
The Sigma (Switching) and Delta (Dimming) 4 channel × 1kW power packs neatly illustrate Zero 88's regard for the problems of installation.
One main feature is the "Inhibit Function" which enables the power packs to be switched on or off remotely by an electronic control signal from Mercury. The packs also include the option of including built-in effects; Sigma with a 4 channel Chaser, and Delta a crossfading Flowlight. The speed at which these effects operate is determined at installation, and is interally adjusted within the power pack. A number of notable features have been included: both Sigma and Delta share the same chassis and any 3 mounted together side by side fit a 19" rack. Standard cable knock-outs are provided on all sides and the back. Each channel in each pack is fitted with a unique circuit protection device which will effectively reduce the incidence of blown fuses. The majority of fuses blow because the conventional method of protecting the triac has been to use the quick blow fuse. A good enough method, but it means that many fuses blow just because a lamp fails. Zero 88 have incorporated a circuit protection device which protects the Triac. This in turn enables them to specify an anti surge fuse which significantly reduces the number of occasions in which a fuse blows. In the unlikely event of a blown fuse, a neon fuse blown indicator will glow on the front panel. Each channel also has a green light which indicates whether a control signal is present. This greatly assists fault finding during both installation and maintenance. Both Sigma and Delta have a chassis which splits into two parts. The top part contains the electronics and simply plugs into the bottom part which contains all the mains wiring. Fitting a pack is thus simplicity itself: mount the bottom on a wall or in a rack (using the Rack Mount and Venting kit), wire up the mains input, control input and mains output connections, plug in the electronics and it's ready for use, Fast pack maintenance is equally simple; you simply unplug the electronics and replace with a new set.
See also:
Documents
Advert: LSI Delta & Sigma (December 1985)
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From Lighting & Sound International
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