Electrician Training - Reading schematics, electrical timers

This Electrician Training video by http://www.bin95.com is a bit of a schematics tutorial on reading schematics as they pertain to electrical timers. It gives you electrical tips on if the relay timers shown are delay on timers or delay off timers too. This is just a small, low resolution sample from DVD 2 of the 10 DVD Industrial Electrical Training Video Library. The actually DVDs have much better quality and more details. http://www.youtube.com/watch?v=m5_i-7...

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Closed Caption:

yeah
the on delay timer contacts are
represented by these symbols for the
normally open and normally closed the
off delay timer contacts are represented
by these symbols also for the normally
open and normally closed the difference
between the two and actually what
differentiates the two are these parts
of the symbols which if put together
represent to half arrows pointing in
different directions in the on delay
case these contacts can be seen reacting
in the upward direction which means that
they react on the off to on transition
of the timer when the timer is turned on
in the off delay the action is
represented when the input of the timer
goes down to off will touch more of
these representations in a second
in addition to the time delay contacts
the on-and-off delay timers also have
instantaneous contacts which open or
closed as soon as the timer is energized
for example if the push button is
pressed it will turn the timer on to
start timing and it's instantaneous
contacts were closed immediately the
delay contacts were closed later as
we'll see shortly
more PLC training go to bid 95 dot-com
and click on the electrical video
library on the left hand side
yeah
yeah
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