Nordson cp, Руководство по эксплуатации продукта

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Troubleshooting
5-5
Part 104373 − 03
E 2015 Nordson Corporation
Corrective Action Possible Cause Problem
4. Pump strokes
irregularly or fluid
pressure fluctuates
(contd)
Leaky siphon or high-pressure ball
check valves
If the pump continuously double
strokes and the plungers are taking a
full 51-mm (2-in.) stroke, close both
the circulation and drain-off valves, if
used, or shut off the spray device.
Both plungers should stop. Quickly
open and close the drain-off valve
(open for
1
/
2
-second or less), or
trigger the spray device.
If one plunger does not stop each
time the valve is closed, or when the
trigger is released, but runs its full
stroke and returns, the fault lies in the
siphon ball check valve on that side
of the pump or the high-pressure ball
check valve on the opposite side.
Rebuild or replace the faulty
component.
No coating material Fill the coating material supply.
5. Gradual loss of fluid
pressure while air
supply pressure
remains constant
Worn hydraulic packings Replace the hydraulic packings.
6. Coating material
mixing with solvent
chamber fluid
Worn hydraulic packings Replace the hydraulic packings.
7. Pump strokes when
circulation and
drain-off valves are
closed
Leaks in hydraulic system Look for fluid leaks in the hydraulic
system and repair them.
Faulty drain valve If fluid leaks out of drain rod when the
drain valve is closed, repair or
replace the valve.
Faulty circulation valve Disconnect the circulating system
return hose at the valve. Blow
compressed air into the circulation
valve through the open fitting. If air
escapes from the siphon rod when
both the circulation and drain-off
valves are closed, the circulation
valve is faulty. Rebuild or replace the
valve.
Leaking siphon or high pressure
ball check valves
Refer to Problem 4.
Continued...