4. Operation
IOM manual - SB series
22
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.
It is the best for pump lifetime to operate at rated capacity and head.
4.5.
Motor protection
Circle thermal protector
SB 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.
SB(…)E pumps
are not equipped with circle thermal protector, instead they have different
protection system, extended with additional features. For more information see chapter
1.8
SB(…)E technical data
and functions
.
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.
Summary of Contents for SB Series
Page 35: ......
