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overload condition, all booth operations quit.
Breakers protect control voltages, 110v and 24v.
Pressing the SPRAY button gives input “2”to the
PLC and the PLC outputs “Q1” giving power to the
exhaust motor starter and the temperature control.
The exhaust motor will begin to run and the
temperature control will energize and run through
the start up checks. After a 0 to 10 second delay the
PLC will output to “Q2” giving power to the intake
motor and the Supply Fan light. The Intake motor
will begin to run and the Supply Fan light will light
up. The paint booth will run in the Spray mode
indefinitely until the off switch or bake switch is
pressed, the fire suppression switch (jumper) is
opened, or a power outage occurs. When the doors
on the spray booth are closed, there will be input to
input “5” at the PLC the PLC will then output to
“Q3” giving power to the spray air solenoid and the
Spray Cycle light.
If the BURNER switch is in the WINTER position,
power is provided to the PLC and shows as “3” on
the PLC input display. The PLC then looks for input
“6” from the air flow switches. The PLC then
provides power to the gas train circuit shown as
“Q7” on the PLC output display.
BAKE MODE:
Touching the BAKE button begins the Bake Mode
and provides power to the PLC and shows as “4” on
the PLC input display. The PLC will perform a
purge time sequence, during which the output “Q3”
will be de-energized and “Q4” will be energized.
This will drop power to the spray air solenoid and
the Spray Cycle light and light the Purge Cycle light.
At the end of the purge cycle the PLC drop output to
“Q4” and give power to output “Q5”. This will shut
off the purge light and give power to the Bake Cycle
light, Bake timer and the RRB relay. The Bake timer
will begin to count down, the RRB relay will
energize the change over damper solenoid, bypass
the spray high limit switch and set the temperature
control to the second set point (bake temperature).
The PLC will then look for input an input 8 from the
bake timer.
COOL DOWN MODE.
When the bake timer completes cycle, the
timer will input “8” at the PLC. The plc will
then drop output at “Q5” and output to “Q6”
de-energizing the bake timer, RRB relay and
bake cycle light and energizing the Cool Down
light. The booth returns to the spray cycle
mode during the cool down cycle with the
compressed air non-functional. The internal
timer, from 0 to 10 minutes, for cool down
begins in the PLC.
SHUT DOWN MODE.
When the PLC internal cool down timer
makes, the booth will shut down and will not
restart until the spray button is pressed.
Summary of Contents for Chinook II
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