TapFlo SK Series, Manual, Page: 20 / 35

4. Operation
IOM manual - SK series 20
4.3.2. Three-phase pumps
1. Operate the pump for a short time (1 to 2 seconds) , and then check the correct pump
rotation.
WARNING:
Before changing the connections to reverse rotation, make sure that the power supply (i.e.
circuit breaker) is properly disconnected and that the impeller has stopped completely. Failure
to observe this may lead to serious accidents, including electrical shock, short, or injury.
Use a phase rotation indicator to check the correct pump rotation.
NOTICE:
When using a phase rotation indicator, read carefully it’s the operation manual.
Two ways to check the correct pump rotation
By looking at the impeller; the rotation of the
impeller should be counter clockwise as
shown in the figure on the right.
By looking from the top of the pump.
Because the impeller cannot
be seen in this
position, the best way to check the rotation
is check the kick back motion of the pump
when the pump just starts. The kick back
motion of the pump should be counter
clockwise as shown in figure on the right.
To reverse the rotation, the following countermeasure must be taken.
COUNTERMEASURE:
Interchange two of the three wires designated U, V,
and W, respectively.
2. Operate the pump for a short time ( ≤ 1 minute) and perform the following checks:
➢
Operating current: use an AC ammeter (clamp), measure the current at the phase U, V,
and W that are connected to the terminal board.
➢
Operation voltage: use an AC voltmeter (tester) to measure the voltage at the terminal
board.
➢
Power supply voltage tolerance: within ±10% of the rated voltage (see chapter 1.2.
Pump design )
➢
Vibrations