 |
Permus Dimmer Racks, embodying Permus Thyristor dimmer
modules, are the economic power-handling component for permanent, hard-wired
lighting control systems. These shallow racks require only front access,
plus top access for the electrical contractor, and can be mounted against
a wall, or mounted back to back; either method ensures that only the very
minimum of valuable floor space is required.
Dimmer Modules
The
rugged and reliable Permus dimmer modules incorporate a temperature-stable
trigger card with hard firing on each pair of tungsten surge-rated Thyristors
mounted on generous heat-sinks. Hard-firing ensures stable operation on
loads as low as 40 watts and for transformer-fed lamps. A new transfer
characteristic has been incorporated to give increased control sensitivity,
and improved standards of reliability, and safety, are ensured by elimination
of the bottom-set potentiometer.
Dimmer Racks
The standard width Permus racks, stocked and ready for despatch, are already
fitted with either 24 x 10A dimmers in twin module format, or alternatively
12 x 20/25A single dimmer modules. For maximum flexibility of the total
number of dimmer channels, and to allow mixed ratings in a multiple rack
installation, there is also a narrower rack available housing either 12
x 10A, or 6 x 20/25A dimmers. All Permus dimmer racks employ natural air
flow ventilation, are available with either Reyrolle or Neozed close-excess
current protection, and are internally wired for a three phase and neutral
incoming supply. Provision is made to allow each two adjacent dimmer modules
(4 x 10A) to be changed, on site, to a different phase, or to change to
a single phase and neutral supply.
Tempus
Control Desks
For use with Tempus desks a power supply unit needs to be added to one
Permus rack and twin or quad control socket boxes are necessary to receive
the plug-terminated flexible cable for each block of 6 channels.
From Rank Strand
information leaflet "Preset Lighting Controls and Dimmers"
|
