Carlisle Ransburg DynaFlow 77376, Руководство по обслуживанию, Страница: 66 / 96

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 CHANNEL or
GUN. System errors are typically related to the disk drive,
file I/O operations or communications.
Reverse Flow Limits
Explanation: The controller has sensed that material has
flowed backwards through a flow meter and exceeded the
preset REVERSE FLOW LIMIT value for that CHANNEL.
There are several possible causes for this.
1. The check valve for one of the CHANNELs has failed in
the open condition and the opposite 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 feedback
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 connections 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. Reference 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 CHANNEL 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 command 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 for a total of 32 seconds without faulting. As soon
as the controller senses flow from the master CHANNEL,
the timer is reset and will start once again the next time a
trigger signal is received with no master CHANNEL flow.
Corrective Action:
In most cases, this fault is generated by the master
CHANNEL flow meter gears not turning (usually stuck).
Try flushing the system and watch the flow rate or flow
volume on the operator interface. If there still is no flow,
disassemble and clean the flow meter. If this still does
not correct the problem, see the section in this manual on
FLOW TOO LOW FAULTS. If this fault occurs while the
operator was not trying to spray, then the air flow switch
may be defective. This can be verified by the GUN status
on the operator interface.
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