Theatre Design & Technology - Summer 1991 - 32

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Theatre Design & Technology
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ormation

P'oiessionolsn ;he Performing Arts

For adver'ising information call:
Patrice Suilon

E.'enlS ProauCTion Group
2 I 2· 77-5

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Power Supply

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unit, but they require a larger and more
expensive industrial power supply. The
12 VDC magnets can operare wirh a less
sophisticated and cheaper power supply,
but the inexpensive power supplies
cannot be interfaced with programmable
logic controllers (PLC).
A magnet's duty cycle must be taken
into account when selecting electromagnets. If the magnet will be operating
more that 50% of the time or for periods
of more than six minutes, a magnet with
a continuous duty cycle is required.
Although intermittent magnets offer
more holding power for rhe price, mosr
theatrical applications will demand
much more than six minutes of
continuous operation.
Flat-faced electromagnets are available
in circular and rectangular shapes.
Circular magnets range in size and
capacity from a 3/4" diameter unit that
holds nine pounds to a 5" diamerer that
has a rating of 900 pounds. The circular
magnets are the easiest to mount. The
proper-sized hole for the magnet
diameter can be cur with a hole saw, and
the back face of the magnet comes
tapped with a 1/4" 20 hole.
Electromagnets will artracr and lock to
all types of steel; however, mild steel has
the best magnetic properties. For
maximum effectiveness, electromagnets
must be in direct contact with a flat
surface that is slightly larger than the
magnet's face. Any air gaps will reduce
the effectiveness of the magnet.
Although clean surfaces are best, a thin
coat of paint on the electromagnet and
the sreel plate does not seem to reduce
the effectiveness of the system.

7 Fox 212- 77-3857

A suitable power supply must be selected
when choosing the magnets for the
system. Electromagnets operate on direct
current, so they can be battery operated.
A permanent power supply that operates
with household current is a better
solution, especially if you choose 24 VDC
magnets.
Both electromagnets and power
supplies are rated for maximum loads in
the appropriate DC voltage. The greater
the holding power of the magnet, the
greater the load for the transformer. The
total wattage of all of the magnets
controlled in a system cannot exceed the
maximum rating of the power supply.
Sizes of power supplies range from a
lightweight 12 VDC model with a
capacity of 24 watts to a 6000 watt 24
VDC industrial system. As stated earlier,
the industrial power supplies offer the



Table of Contents for the Digital Edition of Theatre Design & Technology - Summer 1991

Contents
Theatre Design & Technology - Summer 1991 - 1
Theatre Design & Technology - Summer 1991 - 2
Theatre Design & Technology - Summer 1991 - 3
Theatre Design & Technology - Summer 1991 - Contents
Theatre Design & Technology - Summer 1991 - 5
Theatre Design & Technology - Summer 1991 - 6
Theatre Design & Technology - Summer 1991 - 7
Theatre Design & Technology - Summer 1991 - 8
Theatre Design & Technology - Summer 1991 - 9
Theatre Design & Technology - Summer 1991 - 10
Theatre Design & Technology - Summer 1991 - 11
Theatre Design & Technology - Summer 1991 - 12
Theatre Design & Technology - Summer 1991 - 13
Theatre Design & Technology - Summer 1991 - 14
Theatre Design & Technology - Summer 1991 - 15
Theatre Design & Technology - Summer 1991 - 16
Theatre Design & Technology - Summer 1991 - 17
Theatre Design & Technology - Summer 1991 - 18
Theatre Design & Technology - Summer 1991 - 19
Theatre Design & Technology - Summer 1991 - 20
Theatre Design & Technology - Summer 1991 - 21
Theatre Design & Technology - Summer 1991 - 22
Theatre Design & Technology - Summer 1991 - 23
Theatre Design & Technology - Summer 1991 - 24
Theatre Design & Technology - Summer 1991 - 25
Theatre Design & Technology - Summer 1991 - 26
Theatre Design & Technology - Summer 1991 - 27
Theatre Design & Technology - Summer 1991 - 28
Theatre Design & Technology - Summer 1991 - 29
Theatre Design & Technology - Summer 1991 - 30
Theatre Design & Technology - Summer 1991 - 31
Theatre Design & Technology - Summer 1991 - 32
Theatre Design & Technology - Summer 1991 - 33
Theatre Design & Technology - Summer 1991 - 34
Theatre Design & Technology - Summer 1991 - 35
Theatre Design & Technology - Summer 1991 - 36
Theatre Design & Technology - Summer 1991 - 37
Theatre Design & Technology - Summer 1991 - 38
Theatre Design & Technology - Summer 1991 - 39
Theatre Design & Technology - Summer 1991 - 40
Theatre Design & Technology - Summer 1991 - 41
Theatre Design & Technology - Summer 1991 - 42
Theatre Design & Technology - Summer 1991 - 43
Theatre Design & Technology - Summer 1991 - 44
Theatre Design & Technology - Summer 1991 - 45
Theatre Design & Technology - Summer 1991 - 46
Theatre Design & Technology - Summer 1991 - 47
Theatre Design & Technology - Summer 1991 - 48
Theatre Design & Technology - Summer 1991 - 49
Theatre Design & Technology - Summer 1991 - 50
Theatre Design & Technology - Summer 1991 - 51
Theatre Design & Technology - Summer 1991 - 52
Theatre Design & Technology - Summer 1991 - 53
Theatre Design & Technology - Summer 1991 - 54
Theatre Design & Technology - Summer 1991 - 55
Theatre Design & Technology - Summer 1991 - 56
Theatre Design & Technology - Summer 1991 - 57
Theatre Design & Technology - Summer 1991 - 58
Theatre Design & Technology - Summer 1991 - 59
Theatre Design & Technology - Summer 1991 - 60
Theatre Design & Technology - Summer 1991 - 61
Theatre Design & Technology - Summer 1991 - 62
Theatre Design & Technology - Summer 1991 - 63
Theatre Design & Technology - Summer 1991 - 64
Theatre Design & Technology - Summer 1991 - 65
Theatre Design & Technology - Summer 1991 - 66
Theatre Design & Technology - Summer 1991 - 67
Theatre Design & Technology - Summer 1991 - 68
Theatre Design & Technology - Summer 1991 - 69
Theatre Design & Technology - Summer 1991 - 70
Theatre Design & Technology - Summer 1991 - 71
Theatre Design & Technology - Summer 1991 - 72
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