Graco ProMix 2KS Operation page 79

Result of the Test
Gauge reading increases and
decreases as % Open value is
changed and fluid flow does not
change or is not present.
Gauge reading does not increase
and decrease as % Open value is
changed.
312779E
Cause
The problem is mechanical:
• restriction/plugged hose
• plugged gun tip
• fluid regulator failure
The problem is electrical:
• Fuse F2 is blown
• disconnected wires or cables
• pressure control failure
• V/P valve failure
• flow control board failure
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Integrated Flow Control
Solution
1. Clear any clogs.
2. Remove restrictions.
3. Clean and/or repair fluid regula-
tor.
1. Measure the voltage to the regu-
lator at one of two places:
• At J5 on the fluid control
board, measure across the
white (pin 1) and black (pin 6)
wire connections. The volt-
age should be in the range of
0-3.3 Vdc for 0%-100% Open
command (approximately
1.65 Vdc for 50% Open).
• At J2 on the flow control
board of the module, mea-
sure across the red (pin 1)
and black (pin 2) wire con-
nections. The voltage should
be in the range of 0-21 Vdc
for 0%-100% Open com-
mand (approximately 12 Vdc
for 50% Open).
2. If voltage is not present, check if
fuse F2 on the fluid control board
is blown.
3. If voltage is present, ensure the
cable is properly connected to
the module circuit board.
4. If cable is properly connected,
replace pressure control, VP
valve, and flow control board
sequentially to isolate failure. See
manual 3A2097.
79