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4. Measuring Methods
Operation of 3-Phase Rotation Tester :
(1) Connect the test lead to 3-phase input
terminals by R-S-T.
(2) Connect color alligator clips to the terminals
of a 3- phase power source. Connecting
order is optional.
(3) Make sure that all of the three lamps for open
phase check are on. If so, there is no open
phase. When any of the three lamps is not on,
there is open phase.
Open phase
check lamp
"R" is not on
Open phase
check lamp
"S" is not on
Open phase
check lamp
"T" is not on
(4) Check the rotating direction of the rotation
indicator.
Open phase on
terminal where
RED alligator clip
is connected
Open phase on
terminal where
YELLOW alligator
clip is connected
Open phase on
terminal where
BLUE alligator
clip is connected
-4-
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