EBARA DML Instruction Manual page 15

Over current
Pump vibrates,
generating large noise.
○ Large
fluctuations of
voltage.
○ Significant voltage drop.
○Phase is lost.
○ Operating the 50Hz pump at 60H.
○ Operating the pump in reverse rotation
state.
○ Low head resulting in excess flow rate.
○ Pump caches foreign matter.
○ Motor bearing is broken.
○ Pump is in reverse rotational direction.
○ Pump catches foreign matter.
○ Piping is in resonance mode.
○ Request the electric power company for
power source
action.
○ Request the electric power company for
action.
○ Inspect the connection section and the
magnet switch.
○ Check the nameplate.
○ Establish the correct rotational direction,
(refer to ６ -2-2).
○ Narrow the opening of the gate valve. If no
gate valve is used, replace the pump with
the one having lower head.
○ Disassemble the pump to remove the
foreign matter.
○ Repair or replace the bearing.
○ Establish the correct rotational direction,
(refer to ６ -2-2).
○ Disassemble the pump to remove the
foreign matter.
○ Modify the piping.
EBARA
- 15 -
Corporation