48
Troubleshooting
Troubleshooting
First check the following points. If the following measures do not help remove problems, con-
tact your nearest distributor.
■ Pump
States
Possible causes
Solutions
The pump does not
run. (LED does not
light. Blank screen.)
Power voltage is too low.
• Observe the allowable voltage range of
90-264VAC
The pump is not powered.
• Check the pump is switched on if any.
• 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
pumped up.
Gas lock in the pump
• Expel air. See page 32.
Stroke length is too short.
• Run the pump with full stroke length and
then with proper length.
Air ingress through a suction line
• Reroute 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 valves.
Replace as necessary.
A ball valve is stuck on a valve seat.
• Dismantle, inspect and clean the valve.
Replace as necessary.
A flow rate fluctuates.
Air trapped in the pump head.
• Expel air. See page 32.
Overfeeding occurs.
• Mount a check valve. See page 25.
Foreign matters are stuck in the pump
head valves.
• Dismantle, inspect and clean the valves.
Replace as necessary.
Diaphragm is broken.
• Replace the diaphragm.
Pressure fluctuates at an injection
point.
• Maintain the pressure constant by optimiz-
ing tubing or by relocating the injection
point.
Liquid leaks.
The fitting or the air vent body is
mounted loose.
• Retighten them.
The pump head is mounted loose.
• Retighten the pump head. See page 31.
O rings or valve gaskets are not in-
stalled in place.
• Install O rings and valve gaskets.
Diaphragm is broken.
• Replace the diaphragm.
Excessive discharge pressure
• Check that a discharge line is not closed.
• Check if tubing is not clogged.
Summary of Contents for EHN-B11-NAE
Page 67: ...67 Specifications ...
