Motor Connections - Star And Delta - Bosch Rexroth EFC 3600 Easy Start Manual

Easy Start Guide
Bosch Rexroth EFC 3600 Series Inverter

3. Motor Connections - Star and Delta

Dual voltage induction motors typically include
terminal boxes with six points. The points 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
shown below. These are known as "Star" (the
higher voltage) or "Delta" (the lower voltage).
Link
Phase
Phase
Phase
Link
Phase
Phase
Phase
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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
are current in each configuration.
Delta is represented by a triangle and star by a
Y (Wye).
3.1 Motor connected in STAR (or Wye):
For safety purposes, Star (shown opposite) is
STAR
the default configuration for new motors 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
Earth
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 earth terminal.
Screen
3.2 Motor connected in DELTA:
The link configuration is shown in the
DELTA
illustration opposite and is sometimes referred
to as "three-a-breast".
The order of the three phases determines the
direction the motor turns.
Earth
Note that the cable screen and earth are
connected together at the earth terminal.
Screen
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