4. Operation
IOM manual
–
SG series
20
4.4.
Operation
WARNING:
➢
The pump may be extremely hot during operation. To prevent burns, do not touch the
pump with bare hands.
➢
Do not insert your finger or any object into the pump's inlet opening. Doing so may
cause injury, electrical shock, short, or fire.
➢
When the pump is not used for a long time, make sure that the power supply (such as
a breaker) is properly disconnected. If the wiring insulation deteriorates with the power
supply connected, it may cause current leakage, electrical shock, or fire.
WARNING:
➢
During inspection and repair, disconnect the power supply to avoid starting the pump
unintentionally. Failure to disconnect the power supply may lead to serious accidents
including electrical shock, short, and injury.
➢
During a power outage, disconnect the power supply to the pump. Unintentional
operation of the pump after power resumption would be extremely dangerous to
people around the pump.
CAUTION:
Do not operate the pump at unusually low head, or when the strainer is clogged with debris.
Doing so will prevent the pump from attaining its full capabilities, and may also generate
abnormal noise and vibration and cause damage to the pump, which may lead to current
leakage, electrical shock, and fire.
NOTICE:
➢
It is the best for pump lifetime to operate at rated capacity and head.
➢
A large electrical current flows when a submersible pump is started, causing the motor
windings temperature to rise rapidly. Frequent pump stop-and-go operation will
accelerate motor windings insulation deterioration, affecting motor lifetime
4.5.
Motor protection
Circle thermal protector
Pumps are equipped with an internal motor protective equipment - circle thermal protector.
To protect the motor, if a current overload occurs in the motor or if the motor overheats under
the conditions given below, the pump will stop automatically, regardless of the water level
during operation.
➢
Extreme fluctuation of power supply voltage.
➢
Pump operated under overload condition.
➢
Pump operated at open phase or binding condition.
CAUTION:
Unless the cause of a problem is removed, the pump will repeat the stop-and-go cycle,
eventually resulting in damage to the pump, and causing current leakage and electrical shock.
Therefore, after verifying that the power supply is disconnected, find and correct the cause of
the problem through inspection and repair.
