User guide

Troubleshooting 29
Table 6-1 Flow Monitoring System Troubleshooting
Symptom Probable Cause Corrective Action
Electrical connections are loose or
FMS cable is faulty.
Reseat loose connectors or replace faulty
cable. See Section 7 - Parts Replacement.
Air bubbles passing through in flow
meter.
Allow sufficient fluid to flow through the fluid
system until air bubbles are no longer
present.
Debris or partially cured coating
material is lodged in the flow meter
gears.
Flush the fluid system with an appropriate
solvent or clean the flow meter. Refer to
Section 5 - Maintenance and Service.
The software is not
recording the flow
of coating material.
Fluid Pressure Regulator has a leak
causing the downstream pressure to
increase. (The flow does not occur
at the flow meter causing the Fluid
Pressure Regulator valve to stay
closed.)
Clean or replace the ball and seat of the
Fluid Pressure Regulator. Refer to the
C-740/C-741 Installation, Operations, and
Maintenance Manual.
The flow through the fluid system is
varying.
Check the flow onto the substrate or weight
samples. If the flow is actually varying,
inspect the nozzle for cleanliness and/or
viscosity. Clean nozzle as needed.
Debris or partially cured coating
material is lodged in the flow meter
gears or bearings.
Try flushing the fluid system with an
appropriate solvent or clean the flow meter.
Refer to Section 5 - Maintenance and
Service.
The recorded flow
is varying greatly.
The shim(s) in the flow meter may
be bent or missing. Gears may be
scratched or installed incorrectly.
Disassemble flow meter and inspect shims
and gears. Replace damaged parts as
needed. Refer to Section 5 - Maintenance
and Service.
Amount of coating is below lower
limit.
Inspect and clean nozzle if blocked. If no
blockage found, increase fluid pressure.
Amount of coating is above upper
limit.
Reduce fluid pressure. Refer to the
C-740/C-741 Installation, Operations, and
Maintenance Manual.
Beacon red light is
flashing, continuous
beeping sound.
Flow meter leaks due to a damaged
Teflon O-ring or improper assembly.
Replace the Teflon O-ring or correct the
improper assembly. Refer to Section 5 -
Maintenance and Service.
The flow meter
gears produce a
humming or
whining sound.
Air pressure to the fluid reservoir is
set too high.
Reduce the fluid pressure. Refer to the
C -740/C-741 Installation, Operations, and
Maintenance Manual.
Fluid leak in fluid system.
Inspect fluid lines and fittings for leaks.
Correct the faulty conditions or replace faulty
parts. See Section 7 - Parts Replacement.
Pressure imbalance in the fluid
system due to pot depressurization
resulting in backflow to the reservoir.
Wait for pressure to balance in the fluid
system. When balanced, the backflow to the
reservoir should stop.
The software is
counting signals
when there is no
obvious flow of
coating material.
Fluid Pressure Regulator is leaking.
Debris in the fluid pressure regulator seat or
a malfunction is causing flow from the high
pressure to the low pressure side. Clean or
replace fluid pressure regulator.