IWAKI PUMPS EHN-R, Инструкция по эксплуатации

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Troubleshooting
Troubleshooting
First check the following points. If the following measures do not help removing
problems, contact us or your nearest dealer.
States Possible causes Solutions
The pump
does not
run. (LED
does not ap-
pear. Blank
screen.) Power voltage is too low. • Recover the power voltage to a
normal level.
Allowable voltage range: 90-
264VAC
The pump is not powered. • Check the switch if it is installed.
• Correct wiring
• Replace a breaking wire to new
one.
An electronic circuit in the control
unit is failed. • Replace the control unit.
Liquid can
not be
sucked up. Air lock in the pump • Expel air. See page 33.
Stroke length is too short. • Run the pump at 100% stroke
length and adjust it to proper
length.
Air ingress through suction line. • Correct tubing.
A valve set is installed upside
down. • Reinstall the valve set.
Valve gaskets are not installed. • Install valve gaskets.
Foreign matters are stuck in the
pump head valves. • Dismantle, inspect and clean the
valve. Replace as necessary.
A ball valve is stuck on a valve
seat. • Dismantle, inspect and clean the
valve. Replace as necessary.
The fl ow
rate fl uctu-
ates.
Air stays in the pump head. • Expel air. See page 33.
Overfeeding occurs. • Mount a check valve. See page
24.
Foreign matters are stuck in the
pump head valves. • Dismantle, inspect and clean the
valve. Replace as necessary.
Diaphragm is broken. • Replace diaphragm.
Pressure fl uctuates at an injection
point.
• Review tubing layout to maintain
a pressure constant at an injec-
tion point or change an injection
point in a constant pressure.