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Remarks
11. Operation
Item
Remarks
No.
Confirmation of
piping, wiring,
and voltage
Confirmation of
valves
Confirmation of
liquid in pump
Starting up
●
Confirm piping and electrical wiring, referring to
descriptions in piping and wiring sections.
●
Confirm that line voltage is appropriate, referring
to nameplate.
●
Valves on suction side and discharge side should be
fully opened.
●
When pump is used by priming method, prime
pump sufficiently.
●
After confirming items 1~3 above, turn ON pump
power supply, then check whether liquid is being
fed smoothly. If not, immediately turn off power
supply and eliminate cause of problem, referring to
"Causes of Trouble and Troubleshooting" section on
page 21.
1
2
3
4
Item
No.
Operation
During opera-
tion
●
Adjust valve gradually to obtain specified values of
discharge, discharge pressure, or vacuum.
●
Do not open/close suction port and discharge port
suddenly. This may lead to disconnection of mag-
net coupling, so that gears cannot rotate. If this
happens, turn off power supply. As motor stops,
normal coupling will be restored.
●
Do not operate pump with discharge valve and/
or suction valve completely or almost completely
closed. Set operating pressure to at least 0.1MPa
lower than set value of relief valve pressure in case
of MDG-R2( )V type.
●
Be careful not to allow any foreign matter to enter
pump. Foreign matter may cause gear locking or
abnormal wear of gear.
●
If earth leakage breaker is actuated, reset it only
after carefully examining cause of actuation. Be
sure to turn off power supply before examining
cause.
5
6
11-1. Operation
After pump installation, piping, and wiring, follow the start-up pro-
cedure described below.
CAUTION!
Never operate the pump dry or operate the pump with the
discharge and/or suction port closed (with the valve closed).
Such an operation damages the pump.
