Technical information

Table Of Contents

6 – APPLICATIONS

Wye Delta Starter

The presence of these resistors in a closed transition starter smoothes the transition from Wye to Delta operation mode. A typical

closed transition Wye-Delta starter schematic is shown in the following figure

Figure 12 – Wye Delta Motor Connection to the MX

Mechanical

Interlock

T3 T6

Resistor

L1 L2 L3

Control Power

1M 1S

Run

UTS

2M MX

Input Common

To TB3, C1+ (White Wire)

To TB3, C2+ (White Wire)

To TB3, C3+ (White Wire)

To TB3, C1- (Black W ire)

To TB3, C2- (Black W ire)

To TB3, C3- (Black W ire)

Current Feedbacks

to MX

Line

Voltage &

Frequency

to MX

To TB4 (SCR 1) K1

To TB6 (SCR 2) K2

To TB8 (SCR 3) K3

2M Confirm

For the Wye-Delta starter mode to operate properly, one output relay needs to be programmed to the RUN output function and

another output relay needs to be programmed to the UTS output function.

For operation of the Wye-Delta and its transitions from a start to a completed run, refer to Section 8.5, Wye-Delta Operation.

The closed transition resistors generally are sized to be in the circuit for a short period of time. To protect the resistors from over

heating, one input should be programmed as a Bypass/2M contact feedback input and the Bypass/2M confirm parameter must be set.