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B. Run the pump for a short time (≤ 1 minute) and check:
•
Operating current
Use an AC ammeter (clamp) and measure the current on the U, V and W phases that are
connected to the terminal box.
•
Operating voltage
Use an AC voltmeter (tester) and measure the voltage at the terminal box.
Supply voltage tolerance = within ±10% of nominal voltage.
•
Vibration
CAUTION
:
If the pump produces a large amount of vibration, noise or odour, disconnect power immediately
and contact a service centre.
Continue operation if no abnormalities are observed during test operation.
6.3 Operation
ATTENTION:
•
The pump can get very hot during operation. To avoid burning yourself, do not touch the pump with
your bare hands.
•
Do not insert your finger or objects into the pump suction port. This could cause injury, electric shock
or fire.
•
If you will not be using the pump for an extended period of time, check for proper power disconnection
(e.g. circuit breaker). If the cable insulation deteriorates, this could cause arcing, electric shock or fire.
WARNING:
•
During checks and repairs, disconnect the power supply to prevent the pump from switching on by
accident. Failure to disconnect power can cause serious accidents, including electric shock, short
circuit and injury.
•
Disconnect the power to the pump in the event of a power failure. Inadvertently starting the pump after
power has been restored could pose a great danger to persons in the vicinity of the pump.
CAUTION:
•
If the cause of the problem is not removed, the pump will repeat the stop-and-go cycle, which can
damage the pump, causing overheating and electrical shock. Therefore, after checking the
disconnected power supply, find and fix the cause of the problem by performing an inspection and
repair.
•
Do not run the pump with more than the specified delivery height or if the strainer becomes clogged
with debris to avoid decreased functioning of the pump an increased noise or vibration, pump
damage, electric arcing, electrical shock or fire.
If a current overload occurs in the motor, or the motor overheats under the conditions listed below, then it
will automatically shut down for protection regardless of the water level during operation.
•
Extreme power supply voltage fluctuations.
•
Operation in overload.
•
Operation with open phase or stalls.
6.4 Motor protection system
ATTENTION:
1. Thermal protection circuit
Some pumps are equipped with an internal motor protection device (thermal circuit breaker).
If excessive current or overheating of the motor is detected, for example for the following reasons, the
pump will automatically stop regardless of the water level to protect the motor.
•
Reversing the polarity of the supply voltage
