Ransburg DynaFlow User Manual - Manual (Page 74)

LN-9400-00.9
Corrective Action:
Simply save a JOB # for the indicated GUN making
sure the parameters are correct. The Gun can be
placed in RUN mode without generating the GUN
NOT READY error.
System Errors
System errors are not associated with any CHAN-
NEL or GUN. System errors are typically related
to the disk drive, file I/O operations or communi-
cations.
Reverse Flow Limits
Explanation: The controller has sensed that mate-
rial has flowed backwards through a flow meter
and exceeded the preset REVERSE FLOW LIMIT
value for that CHANNEL. There are several pos-
sible causes for this.
1. The check valve for one of the CHANNELs
has failed in the open condition and the oppo
site CHANNEL material is at a higher pressure
causing the material to back up into the other
paint line.
Corrective Action:
The system must be flushed immediately and the
faulty check valve replaced.
2. Sometimes this error can be generated after
a GUN has been flushed and left unused for
a period of time, such as at the end of the day or
end of a shift. This is probably due to pressure
trapped in the line between the fluid regulator
and the applicator. This pressure could eventually
back up through the flow meter and through the
weep port if using a weeping type MVR valve, or
through a small leak in the system.
Corrective Action:
Make sure that the applicator stays triggered ON
for several seconds after it has been taken out of
a CLEAN mode in order to relieve the pressure.
3. If operating the GUN for the first time, the feed-
back signals could be reversed from the flow meter.
Corrective Action:
Verify that the source and gate signals are routed
correctly. This includes the fiber-optic cable con-
nections at both the flow meter and receiver and
wiring connections from the receiver to the control
rack mother board.
4. If using a single phase flow meter that is not
capable of reverse flow detection, then the "phase"
signal input must be connected to +24 VDC. Ref-
erence the "Mother Board Signal Identification" in
the "Appendix" section of this Manual.
No Master Flow
Explanation: This fault will only occur on GUNs
configured for MANUAL operation. For a GUN
configured for MANUAL operation, as soon as the
GUN is placed in RUN mode, the master CHAN-
NEL fluid regulator opens to the MVR HIGH set
point (usually 100 psi). This is typically full open. In
this way, operators can demand as much fluid as
they wish with only the slaved (typically catalyst)
CHANNEL being controlled to the desired ratio.
It is possible, however, for the master CHANNEL
flow meter gears to stick, and still allow fluid to
pass through the flow meter. When this happens,
the applicator continues to flow resin (master
CHANNEL) but the controller is unaware that
material is flowing and therefore does not com-
mand any catalyst (slaved CHANNEL) material
to flow. To prevent this from happening, an air
flow switch placed in the atomizing air line can
send a trigger signal to the controller. When the
controller receives a trigger signal, it immediately
determines if the master CHANNEL flow meter is
sending pulses. If it is not, the controller issues a
NO MASTER FLOW fault.
In many cases, however, operators use their GUNs
to blow dust and water off of the parts before
spraying. They do this by pulling the trigger on
the GUN back just far enough to get atomization
air but no paint. When this happens, the controller
receives a trigger signal and no paint flow, which
would cause a fault. To allow for this "blow off"
, a parameter called BLOW OFF TIME is used
(system configuration parameter). The default
value of 32 seconds. With the default value of 32
seconds the operator is allowed to blow off parts
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DynaFlow TM User Manual - Maintenance