38 310531
Configuring the PrecisionFlo Module
Test Procedure A
To use an oscilloscope to determine ON and OFF
delays:
1.
Connect one input channel of an oscilloscope to
the outlet pressure transducer at pins J7–6 and
J7–5 on the flow control board.
2.
Connect the second input channel of the oscillo-
scope to the GUN ON signal at pins GS–1 (or
wire 1831) and GS–2 (or wire 1182).
3.
Place the dispense device in a purge position over
a waste container.
4.
Set the analog Flow Command voltage from the
robot to 5 Vdc.
5.
Start the oscilloscope and dispense for 3 seconds.
6.
Review the waveform on the oscilloscope, examin-
ing the end of the waveform:
If the:
Do This:
Pressure tapers
off or stair steps
during the fall of
the Gun ON signal
Increase the REGULA-
TION OFF delay in 10 msec
intervals until the problem is
eliminated.
psi spikes high, or
if excessive psi is
trapped at the end
of the cycle
Increase the GUN OFF delay in
10 msec intervals until the
problem is eliminated.
7.
Review the waveform on the oscilloscope. There
should be no pressure overshoot visible in the
pressure sensor output when the GUN ON signal
rises.
If the:
Do This:
Initial psi spikes
then drops to
regular psi
Increase the REGULATION ON
delay in 10 msec intervals until
the problem is eliminated.
Initial psi drops
then builds to
regular psi
Increase the GUN ON delay in
10 msec intervals until the
problem is eliminated.
Test Procedure B
To determine ON and OFF delays:
1.
Set the GUN ON and REGULATION ON delays
to 0.
2.
Set the GUN OFF delay to 0.
3.
Place a bead on the substrate and examine the
end of the bead.
If the:
Do This:
Bead tapers off at
the end of the
bead
Increase the REGULATION OFF
delay in 10 msec intervals until
the problem is eliminated.
Start of the next
bead results in a
wide bead
Increase the GUN OFF delay in
10 msec intervals until the
problem is eliminated.
4.
Place a bead on the substrate and examine the
start of the bead.
If the:
Do This:
Beginning of the
bead has an
excess of material
Increase the REGULATION ON
delay in 10 msec intervals until
the problem is eliminated.
Beginning of the
bead is small
Increase the GUN ON delay in
10 msec intervals until the
problem is eliminated.
