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Waterjet
High pressure pump trouble shooting
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Waterjet
High pressure pump trouble shooting
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Water Jet Cutter Trouble Shooting Steps
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Watrerjet machine has No Pressure
or low pressure
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Waterjet intensifier normal shifting
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a. Check inlet
water supply to see if enough pressure
b. Check if
water boost pump (optional) is working normally
c. Check
if need to replace orifice (Id too big) or water jet not focused (change
nozzle)
d.
Check weep hole on end bell and end cap of intensifier to see if there is
leak of oil or water. If leak water, It is time to replace the HP seal. If leak
oil, need to change the LP seal.
e.
Check if inlet check valve working properly. If not working, waterjet will
return to the low pressure side.
f.
Check if outlet check valve is working properly, touch with hand to see if
it is hot, if yes, meaning the check valve is leaking on the high pressure
side, change inset, or change check valve body .
g.
Check HP plunger. Remove inlet/outlet check valve, Turn on the oil pump,
observe if the plunger is shifting normally.
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Waterjet intensifier shifting slowly or
no shifting
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a. If
not shifting and oil pressure is high, remove the wire connection on both
sides of the solenoid shifting valve and use a screw driver to push either
side to see if the pump can be shifted manually. If not, check the solenoid
valve itself, including the connection of the coil and if the valve is
clogged. If yes, then focus on the hall sensor, and the relays that drive
the coils of the solenoid valve.
b. Adjust the
position of the Hall sensor switch.
c. Check if
the Hall switch and the connected relays
d. Check oil
valve and related electrical circuit including relays.
e. Check if
the oil flow rate is too small. If so, adjust to higher flow.
f.
Check if the oil Flow rate is too high through hydraulic
proportional relief valves
g. Check
if the shifting valve is worn out (internal leak too much) or clogged.
h. Check if
the seal of the oil piston is damaged.
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Waterjet intensifier shifts unevenly
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a. Check both sides of water feeding, one
side maybe no water
b. One of the two sides check valve may
not close well. Service with repair kit.
c. Electric shift valve problem, clean the
valve with diesel.
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Waterjet Pressure is normal or a little
higher than normal, but cutting is slow.
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a. check if high pressure waterjet
tubing is clogged.
b. Check if the nozzle is clogged, wear
out or damaged.
c. Check if orifice is
clogged, wear out or damaged. If orifice clogged, no water jet shoots out,
if nozzle clogged, but orfice is good, then water jet will shoot to the
abrasive feeding line.
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Too much fluctuation in water jet
pressure.
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a. Check if water supply pressure is
too low.
b. Check if there is leak
with outlet check valve. If yes, use the repair kit to repair it or even
may need to change the check valve body.
c. Check if there is leak at
the End Bell. If there is water leak, change the HP seal with the backup
ring.
d. Check if there is oil leak
at the End Bell. If yes, then need to change the oil-seal in the LP
cylinder.
e. If any of the check valves is hot,
need to replace the check valve body.
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Waterjet intensifier pump is over heating
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a. check
if the oil chiller is turned on
b. check
if the hydraulic pump output flow rate is set too high
c. check
if the hydraulic pump internal leaking too high
d. make
sure high pressure is not turned on when cutting is not in progress.
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Waterjet
CNC cutting table trouble shooting
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Symptom
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Possible cause
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Solution
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Can not open control software
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Waterjet Control Software
error
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Re-install the waterjet
control software
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Operating system problem
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Re-install windows operating
software.
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Error warning when simulation
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Check if there is error in G-
code
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Make sure G-code is generated
correctly with respect to the CNC controller used with the water jet
cutter.
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Error in DXF file
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Fix errors in DXF such as
cross point, remove overlapped lines, etc. Pay special attention to the
sequence of the drawing, because the cutting squence is the same as the
drawing. This can avoid extra piercing.
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X or Y axis can not move
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Motor driver error
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Check error or warning code
from the driver and fix the problem accordingly. Reset the parameters if
necessary.
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Motor fail
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Replace the motor.
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connection
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Make sure all connection is good,
especially the connection from the CNC computer to the extension board. And
the phase from the amplifier to the motor is correct.
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hit waterjet machine axis
travel range limit
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move the water jet cutting
head to the opposite direction of the limit.
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Lost step if stepper motor is
used.
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Motor phase error
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Check connection.
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Motor driver error
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Check error or warning code,
replace the driver if necessary.
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Daughter card and I/O
connection board error
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Make sure the connection is
good, replace if damaged.
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Motor Parameter error
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Reset the parameters
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Nothing moves
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Emergency stop button
depressed
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Release the Emergency stop
button
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Electrical connection error.
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Check connection and replace failed
parts.
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Computer virus
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Install anti-virus software.
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Tolerance error of waterjet
cutting
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Error is only in one of the X
and Y axis
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check the electrical gear
ratio, ball screw backlash, and, bearing, and shaft joints
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Error occurs in both X and Y
of the water jet cutting
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Check offset setting. Proper
offset setting can help to reduce error due to kerf of water jet. The size
of kerf can change due to the wear of the nozzle
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