NOVA AND NOVA PRO
Measurements
44
5.6
Phase sequence testing
In practice, we often deal with the connection of three-phase loads (motors and other electro-
mechanical machines) to three-phase mains installation. Some loads (ventilators, conveyors,
motors, electro-mechanical machines, etc.) require a specific phase rotation and some may
even be damaged if the rotation is reversed. This is why it is advisable to test phase rotation
before connection is made.
How to test the phase sequence
Step 1
Select the
VOLTAGE
function with the function selector FCT key. The following menu
is displayed:
Figure 5-40: Phase rotation test menu
Step 2
Connect test cable to the NOVA instrument and follow the connection
diagram shown in figure 5.41 to test phase sequence.
Figure 5-41: Connection of universal test cable and optional three phase cable
Step 3
Check for warnings on the display and check the online voltage/terminal monitor.
The phase sequence test is a continuously running test hence the results will be
displayed as soon as the full test lead connection to the item under test has been
made. All three-phase voltages are displayed in order of their sequence represented
by the numbers 1, 2 and 3.
