Easy Start Guide
3. Motor Connections - Star and Delta
Page 4
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3.2 Motor connected in DELTA:
The link configuration is shown in the
illustration opposite and is sometimes referred
to as “three-a-breast”.
The order of the three phases determines the
direction the motor turns.
Note that the cable screen and earth are
connected together at the motor earth
terminal.
Phase
Phase
Phase
Earth
Screen
3.1 Motor connected in STAR (or Wye):
For safety purposes, Star (shown opposite) is
the default configuration for small motors
(usually to 3kW) and is sometimes known as
“two at one side”.
Only two links are required for Star. Double-up
the links if changing from Delta to allow the
motor to be changed to back in future.
The order of the three phases determines the
direction the motor turns.
Note that the cable screen and earth are
connected together at the motor earth
terminal.
Phase
Phase
Phase
Earth
Screen
Dual voltage induction motors typically include
six connection terminals. The terminals can be
connected together with links in one of two
ways to suit one of the two rated voltages.
The two ways of connecting the links are
shown below. These are known as “Star” (the
higher voltage) or “Delta” (the lower voltage).
Link
The selection of Star or Delta is not optional
and must match the supply voltage.
Dual voltage motor nameplates include
symbols to represent voltage and full load
current in each configuration.
Delta is represented by a triangle and star by a
Y (Wye).
DELTA
STAR
Link
Siemens V20 Series Inverter
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