JOB Queue
The JOB Queue is an input buffer for each of the 8 possible
GUNs in the system. JOBs are loaded into the Queue only
if the GUN is already operating a JOB in the RUN, LOAD,
CLEAN, CALIBRATE modes. Each of the 8 GUNs has a
JOB Queue with a fixed length of 1 (JOB). This permits
the next JOB number for GUN #n to be stored before the
current JOB has been halted. After the current JOB has
been halted the next RUN input signal will initiate the next
JOB number located in the queue.
JOB Number is Loaded into the Queue
Before it is Emptied
1. GUN #3 is running JOB #32 and has NOT been halted.
2. JOB #47 is in the Queue for GUN #3.
3. JOB #54 is now entered into GUN #3’sQueue.
4. This will result in JOB #54 replacing JOB #47 for
GUN #3.
JOB #47 became "lost" and was not processed
by GUN #3.
The Correct Sequencing Should Be:
1. GUN #3 is running JOB #32 and has NOT finished.
(Current JOB #)
2. JOB #47 is in the Queue for GUN #3. (Next JOB #)
3. GUN #3 is halted.
4. The Run input signal is pulsed. (The Trigger input does
not effect the JOB queue)
5. JOB #47 moves up and the Queue empties. JOB #47
becomes the current JOB #.
6. JOB #54 is entered into GUN #3’s Queue. JOB #54 is
now the next JOB for GUN #3.
JOB Queue Defaults
If no JOB is entered into the Queue (the Queue is empty)
the current JOB number reverts to the last JOB number
entered if the GUN Run signal is made active.
1. A Halt signal input will halt the current JOB.
2. Pressing Run will restart the GUN with the old JOB
number.
3. Entering a new JOB number and selecting Run will
restart the GUN with the new JOB number.
Reverse Flow Detection
For two-component systems, both forward and reverse fluid
flow is detected through the flow meter if non-fiber optic
flowmeters are being utilized. Reverse flow detection can
help prevent mixed two-component material from backing
up into the fluid supply system due to check valve failure.
When the controller detects reverse fluid flow in excess of
the programmed REVERSE FLOW LIMIT, it will immedi-
ately shut OFF the fluid regulator valves and prohibit mixed
material from contaminating the fluid supply.
Reverse flow rate is displayed on the main screen of the
Local Operator Interface as a flow rate bar colored red,
instead of green for normal flow rate.
Pot-Life Fault
Each of the GUNs configured as two-component has an
associated Pot Life Time located in the JOB Parameters.
These timers are used for materials that can harden or
setup after a specific time. Hardening material in fluid
lines or the spray applicator can cause costly downtime
and maintenance to correct. The output of the POT-LIFE
TIMER alarm can be connected directly to an external PLC
for automatic initiation of the cleaning cycle, or to an alarm
to alert the operator. The Horn
NOTE
If another JOB number is loaded into the Queue
before it is emptied, the queue contents will be replaced
with the second entry. See the following examples.
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PARTS IDENTIFICATION