BJM Pumps PGV220-575T - Manual (Page 12)

12
Figure 2
If the water level is below “LEVEL 2”, the suctioned air rate will increase; causing
pumping failure of the pump and finally the pump is put in no-load running condition.
In case of this pump, however, unlike vertical submersible pumps the motor frame of
this pump is submerged in the range from “LEVEL 1” to “LEVEL 2” so that the motor is
effectively cooled. When the water level is below “LEVEL 2”, the motor frame exposes
to the atmosphere and consequently the cooling effect comes down, but it is safety with
low temperature because of its non-load run condition.
2. Voltage check - during pump running; sometimes measure the power voltage to
check that it is within the range of 95% - 105% of the specified voltage.
3. Attention to pumping up of high density water where sand, slurry and other solids
are much contained in the pumping of water, the shaft power increases with
increasing mixture density of solids and the motor is eventually overloaded. (Special
technical instructions on this matter are available. It will be furnished upon request).
In such case, read the ammeter to monitor the electric current of the motor and adjust
the pump location.
MAINTENANCE AND INSPECTION
To service or repair your pump, please contact your local BJM Pumps distributor.
Service should only be performed by a qualified electrician.
Insulation resistance of 1MΩ or greater, or unstable values with sudden drops indicates
potential malfunction and should be investigated.
Never touch terminals when measuring insulation resistance. Failure to observe this
caution may cause electric shock.
• Pump should be disconnected from the electric power supply before proceeding
to do any service or maintenance .