Chicago Dryer EDGE - Input Phase; Start-Up Phase

Operating Principles Edge/Edge Blanket
5-18
Start-up Phase
This phase begins when an operator pushes a
green Start button at either station:
NO contacts for CR1 and CR3 are
bypassed.
The bypassed CR1 contact allows 24
VAC to be supplied to the Power Supply
card of MPC1. Output Card OC1 in the
right endframe.
Now, MPC1 in the right endframe sends
a signal to energize CR1, which closes
the two NO CR1 contacts.
One set of CR1 contactors allows power
to flow to energize CON1 and CON2
provided all of the motor thermostats
contacts are closed.
CR2 is pre-energized by output from T4
if all inverter fault contacts are closed.
Once CON2 and CR2 are energized,
contacts will close energizing CR3, if all
safety circuit contacts are closed.
While this is happening, MPC1 sends
a signal through OC2 to energize CR4,
closing its contacts, and signals through
OC1 to the Speed Control board to
energize three of the AC frequency
controllers: INV1 (inlet motor), INV2
(discharge motor), and INV4 (lower
spread motors). OC1 and OC3 also
energize and set the speed of INV3
(upper spreader motors).
SOL1 is also energized, providing
compressed air to the low pressure.
When the Start button is released, the
latching action of the second set of
CR1 contacts and of the first set of CR3
contacts keep the machine running.
NOTE: The compressed air
supply must be turned ON or the
unit will display an AIR PRESSURE
LO message on the CHI Panel.
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Input Phase
This phase begins when an operator loads a
sheet in between the input conveyor belts.
MPC1 receives the signal from PE1.
As the sheet moves into the unit between
the input ribbons and into the pneumatic
clutch-brake rollers, photosensor sets
PE2/PE3 detect the piece.
While the piece continues in between the
clutch-brake rollers, the MPC1 control
board is keeping track of how long the
sensors “see” the piece in order to make
an estimate of its size. This will be used
to determine when to change speeds
during the Spread Phase.
After the sheet clears these sensor sets,
MPC1 energizes SV9 and SV10 to
engage the clutch-brake rollers and hold
the piece.
If MPC1 receives another signal from
PE1 before the previous piece has been
picked up by the transfer clamps, MPC1
energizes SV8 to raise the upper inlet
conveyor ribbon temporarily to prevent
a jam.
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