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Operation
Operation procedure
Remarks
4
Do not operate the pump below the minimum discharge capacity.
►The minimum discharge capacity: 10 /min (MX-F250/-F251/-F400/-F401), 20 /min (MX-F402/-F403)
• Observe the minimum discharge capacity for the prevention of continuous closed-discharge operation. This
rule holds true to not only manual operation but also automatic operation.
CAUTION
Do not run the pump longer than one minute with a discharge valve fully closed.
5
< Points to be checked>
Check a flow meter and con-
firm that pump operation is
as per specifications during
operation.
• If a flow meter is not available, calculate a flow rate from discharge pressure,
suction pressure and current value, taking account of pipe resistance.
CAUTION
In case of trouble, turn off power immediately and solve problems. See "
1. Troubleshooting
".
■ Stopping process
Operation Procedure
Remarks
1
• Close a discharge valve
gradually.
• Do not close a discharge valve sharply whether manually or automatically.
Otherwise, the pump may be damaged by water hammer action which tends to
occur with a long a discharge line. When using a solenoid valve, set it to close
slowly.
2
• Turn off power and stop
pump operation.
• Check that the motor stops slowly and smoothly. If it does not stop smoothly,
inspect the inside of the pump.
3
<Leaving the pump stop>
• Liquid in the pump may freeze and consequently damage the pump in winter. Drain liquid before storage. Be
careful when draining harmful liquid.
• Use a heater to prevent liquid from freezing when the pump is temporarily stopped in an extremely cold region.
• In the event of a power failure, turn off power and close a discharge valve.
