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INSTRUCTION MANUAL
3.6.3
Other Checks Requiring Particular Attention
(1) Minimum operating water level
Be sure that the pump stop level is not lower than the minimum operating
water level specified in the technical document. If the stop level is lower, a
vortex flow can occur causing the pump to intake air, resulting in noise and
vibration.
If there is possibility that the minimum water level may decrease to an
excessive extent, it is necessary to use a minimum water level may decrease
to an excessive extent; it is necessary to use a minimum water level alarm. An
alternative measure would be a water level-dependent automatic control
system where the motor is turned off to automatically stop the pump with the
water lowered to a critical level and is turned on again to resume automatic
operation when water is restores to a safe level.
(2) Pump location relative to pump pit water inlet
If the pump is installed near the pump pit water inlet, it can be considerably
disturbed; it can be shaken and the cables whipped by vigorous inlet water,
resulting in damage. Therefore, the pump should be located as far from the
water inlet as possible.
(3) Size of debris
Entry of large or long debris can result in a blocked impeller.
If such problem actually occurs, the pump can be readily lifted out and
disassembled for servicing, which is however, time and labor consuming.
The primary consideration therefore should be to prevent the ingress of any
oversized objects into the sump by use of a screen, etc. Another important
consideration is to minimize presence of abrasive substances, such as sand, in
the liquid.
If the contents of such substances becomes high, the impeller is increasingly
worn, leading to the degradation of capacity.
Note : In case any problem as above actually takes place, contact us
immediately.
PM32U
P.13
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