Moeller. Wiring manual. Automation and Power distribution

All about Motors

Direct-on-line start of three-phase motors

Moeller Wiring Manual 02/05

8-31

8

Method of operation: Forward travel is

initiated by pressing pushbutton I or II

according to the speed required. Pushbutton I

switches on the feed motion via Q17. Q17

maintains itself via its normally open contact

13-14. If the feed movement is to occur at high

speed star contactor Q23 is energized via

pushbutton II which energizes the high speed

contactor Q21 via its normally open contact

Q23/13-14. Both of the contactors are

maintained via Q21/13-14. A direct switch

over from feed to high-speed during the

process is possible.

High speed reverse is initiated by pushbutton

III: Contactor relay K1 picks up and energizes

star contactor Q23 via K1/14-13. High-speed

contactor Q22 is energized via the normally

open contacts, K1/43-44 and Q23/44-43, and

are maintained via Q22/14-13. The reverse

action can only be stopped via pushbutton 0.

Direct changeover/reversal is not possible.

0: Stop

I = Low speed –

FORWARD (Q17)

II = High speed –

FORWARD (Q21 +

Q23)

III = High speed –

FORWARD (Q22 +

Q23)

Q17: Feed forward

Q21: High speed forward

Q23: Star contactor

K1: Contactor relay

Q22: Retract high speed

L1

(Q17/1)

-F2/F21

95

96

21

22

0

-S11

13

14

A1

A2

N

-F0

13

14

44

21

22

III

21

22

13

14

22

21

I

13

I

II

14

21

-Q22

-Q21

-Q23

-Q17

-Q21

-Q23

31

32

-Q17

-Q22

-Q23

A1

A2

22

21

A1

A2

13

14

-Q17

22

21

-K1

-Q21

-K1

13

14

A1

A2

-Q22

-Q23

-K1

A1

A2

43

44

31

32

31

32

21

22

-Q21

13

14

-Q22

13

14

21

22

III

22

II

Moeller Wiring Manual 02/05

8-32

All about Motors

8

Direct-on-line start with motor-protective circuit-breaker PKZ2

Reversing

Instead of the high-capacity contact modules

S-PKZ2, contact module SE1A…-PKZ2 can

also be used provided a switching capacity of

the circuit-breaker of 30 kA/400 V is sufficient.

L1

L3

L2

U

V

W

M

3

-M1

-Q1

-Q11

I >

13

14

T1

T3

T2

L1

L3

L2

T1

T3

T2

L1

L3

L2

-Q12

13

14

21

22

I>> I>>I>>

A1

A2

21

11

T1

T3

T2

A1

A2

I>> I>> I>>

All about Motors

Direct-on-line start with motor-protective circuit-breaker PKZ2

Moeller Wiring Manual 02/05

8-33

8

a Stop

a remove links with position switches

Q12

L1

(Q11/1)

-Q1

21

22

0

-S11

13

14

I

A1

A2

-Q11

-F0

-Q12

-Q11

-Q12

21

22

-S11

Q11

21

22

13

Q11

14

13

Q11

13

Q12

14

0

I

0

I

II

-S11

A

B

C

II

14

13

21

22

21

22

14

13

1.13

1.14

II

21

22

13

14

13

14

13

14

21

22

21

22

A1

A2

-Q12

Q1

1.14

14

L1

(Q11/1)

A

B

C

21

22

14

13

14

13

21

22

21

22

14

13

-Q1

21

22

0

-F0

1.13

1.14

-S11

21

22

II

21

22

13

14

21

22

13

14

I

-Q11

-Q12

13

14

13

14

-Q12

-Q11

21

22

A1

A2

-Q12

-Q11

N

a

S11 RMQ-Titan, M22-…

Q1

PKZ2/ZM-…

Q12

S/EZ-PKZ2

Q11

S/EZ-PKZ2

F0

FAZ

-Q11

-Q12

14

13 13

22 22

21

-Q11

-Q12

a

All about Motors

Direct-on-line start with motor-protective circuit-breaker PKZ2

Moeller Wiring Manual 02/05

8-34

8

Two speeds

Instead of the

high-capacity contact

modules S-PKZ2,

contact module

SE1A…-PKZ2 can

also be used provided

a switching capacity

of the circuit-breaker

of 30 kA/400 V is

sufficient.

-Q1

M

3

-M1

1U

1V

1W

2U

2V

2W

L1

L3

L2

-Q21

T1

T3

T2

-Q17

A1

A2

21

13

L1

L3

L2

1.13

1.21

1.14

1.22

L1

L3

L2

1.13

1.21

1.14

1.22

-Q2

2214

T1

T3

T2

A1

A2

21

13

22

14

T1

T3

T2

I > I >I >

I > I > I >

I>> I>>I>>

n < n >

1W

1V

1U

2W

2V

2U

All about Motors

Direct-on-line start with motor-protective circuit-breaker PKZ2

Moeller Wiring Manual 02/05

8-35

8

Version 1 Version 2

Q21

13

Q17

13

Q21

14

Q2

1.14

0I

II

Q2

13

Q17

0

I

II

1.14

L1

(Q17/1)

-F0

-Q1

0

-S11

I

II

21

22

1.13

1.14

21

22

21

22

13

14

-Q17

13

14

21

22

14

13

-S11

A

B

14

13

21

22

14

13

14

13

14

21

22

A1

A2

N

-Q2

1.13

1.14

22

21

n>

n<

-Q21

-Q17

-Q21

21

22

A1

A2

n>

n<

C

L1

(Q17/1)

-F0

-Q1

-Q2

0

21

22

1.13

1.14

1.13

1.14

-S11

Q17

14

Q21

14

Q21

21

22

14

13

A

B

14

13

21

22

14

13

22

21

C

-S11

II

n>

I

n<

21

22

21

22

13

14

13

14

-Q17

13

14

13

14

-Q21

21

22

-Q17

21

22

-Q17

A1

A2

-Q21

A1

A2

N

n>

n<

13

Stop

S11 RMQ-Titan, M22-… –

Q1, Q2

PKZ2/ZM-…/S –

Q21

S-PKZ2 n >

Q17

S-PKZ2 n <

S11

RMQ-Titan, M22-… –

Moeller Wiring Manual 02/05

8-36

All about Motors

8

Control circuit device for direct-on-line start

Typical example of circuits with contactor DILM…

Three-wire control

Illuminated pushbutton Two two-way pushbuttons

Two-way pushbutton with

indicator light

T0-1-15511 spring-return

switch with automatic return

to position 1

T0-1-15366 spring-return

switch with automatic return

to position of rest

Two-wire control

Changeover switch

T0-1-15521 with fleeting

contact in the intermediate

position

Pressure switch MCS Float switch SW

0I

Q11

21

13

14

Q11

96

F2

13

14

Q11

A2

13

14

21

22

X1

X2

0I

Q11

13

14

Q11

96

F2

13

14

21

22

-S11

I

0

-S11

13

14

21

22

21

22

21

22

13

14

13

14

A

B

A

0

Q11

13

14

Q11

96

F2

13

14

21

22

I

21

22

13

14

A

B

C

Q11

A2

0

Q11

13

14

Q11

96

F2

1

0

1

Start

2*

1

3

4

S11

Q11

13

14

Q11

96

F2

0

1

Start

2*

1

3

4

I

0

1

I

S11

Q11

13

14

Q11

96

F2

2*

1

3

4

I ON

0

OFF

0

1

S11

Q11

A1

F2

96

-S12

2

1

4

I

P >

Q11

A1

F2

96

2

1

4

6

5

3

Q

Moeller Wiring Manual 02/05

8-37

All about Motors

8

Star-delta switching of three-phase motors

Star-delta starters with overload relay

Arrangement in the motor line

The star-delta starter with overload relay,

including a thermally delayed overcurrent

relay are situated in a standard circuit

configuration in the leads leading to the

motor terminals U1, V1, W1 or V2, W2, U2.

The overload relay is also operational in the

star connection as it is in series with the motor

winding and the relay current flowing through

it = rated motor current x 0.58.

The complete circuit diagram a section

“Automatic star-delta starters SDAINL”,

page 8-39.

Arrangement in the mains supply line

Instead of the arrangement in the motor line,

the overload relay can be placed in the mains

supply line. The section shown here

indicates how the circuit differs from that on

a section “Automatic star-delta starters

SDAINL”, page 8-39. For drives where the F2

relay trips out when the motor is starting in

the star circuit, the F2 relay rated for the

rated motor current can be switched in

the mains line. The tripping delay is thus

increased by approximately four to six times.

In the star circuit the current also flows

through the relay but here the relay does not

offer full protection since its limit current is

increased to 1.73 times the phase current. It

does, however, offer protection against

non-starting.

1

5

3

U1

V1

W1

2

6

4

-Q11

2

6

4

-F2

96

97

95

98

2

6

4

-Q11

-F2

96

97

95

98

-F1

2

6

4

1

5

3

U1

V1

W1

All about Motors

Star-delta switching of three-phase motors

Moeller Wiring Manual 02/05

8-38

8

Configuration in the delta circuit

Instead of the arrangement in the motor line

or mains supply line, the overload relay can be

placed in the delta circuit. The section shown

here indicates the modified circuit diagram

from a section “Automatic star-delta

starters SDAINL”, page 8-39. When heavy,

long-starting procedures are involved (e.g. for

centrifuges) the F2 relay, rated for relay

current = rated motor current x 0.58, can

also be connected in the connecting lines

between the delta contactor Q15 and the star

contactor Q13. In the star circuit no current

then flows through the F2 relay. The motor is

therefore not protected when starting. This

circuit is always used when exceptionally

heavy and long starting procedures are

involved and when saturable core current

transformer-operated relays react too quickly.

2

6

4

-Q15

-F2

96

97

95

98

2

6

4

1

5

3

U2

W2

V2

-Q13

1

5

3

2

6

4

All about Motors

Star-delta switching of three-phase motors

Moeller Wiring Manual 02/05

8-39

8

Automatic star-delta starters SDAINL

Arrangement and rating of protective devices

Rating of switchgear

Q11, Q15 = 0.58 x I

e

Q13 = 0.33 x I

e

Position A Position B

F2 = 0.58 x I

e

with F1 in position B t

a

F 15 s

Q1 = I

e

t

a

> 15 – 40 s

Motor protection in y and d configuration Only partial motor protection in y

configuration

M

3

-M1

U1

V1

W1

W2

U2

V2

L1

L3

L2

2

6

4

-Q15

-F2

96

97

95

98

2

6

4

1

5

3

-Q13

1

5

3

-F1

1

5

3

2

6

4

1

5

3

2

6

4

-Q11

B

-Q1

A

PE

2

6

4

13

14

21

22

I > I >I >

All about Motors

Star-delta switching of three-phase motors

Moeller Wiring Manual 02/05

8-40

8

Further notes on the configuration of the overload relay a section “Automatic star-delta

starters SDAINL”, page 8-39.

Automatic star-delta starters SDAINL00AM to 4AM250

For connection of further control circuit

devices a section “Control circuit devices for

star-delta starting”, page 8-49

Method of operation

Pushbutton I energizes timing relay K1, the

normally open contact K1/17–18

(instantaneous contact) which applies voltage

to star contactor Q13. Q13 closes and applies

voltage to mains contactor Q11 via normally

open contact Q13/14–13.

Q11 and Q13 maintain themselves via the

normally open contacts Q11/14–13 and

Q11/44–43. Q11 applies voltage to motor M1

in star connection.

Pushbutton Two-wire control

Q11: Mains contactor

K1: Timing relay approx. 10 s

Q13: Star contactor

Q15: Delta contactor

Two-way pushbutton

Control circuit

device

I = ON

0 = OFF

L1

(Q11/1)

-F2

95

96

0

-S11

13

14

A1

A2

N

-F0

44

21

22

2

13

14

I

-Q11

-Q15

-K1

A1

A2

22

21

A1

A2

A1

A2

-Q15-Q13

43

44

43

-Q11

-Q13

13

14

L1

(Q11/1)

-F0

95

96

-F2

13

14

13

14

-S14

13

14

13

14

-Q1

-Q11

14

13

22

21

-Q13

-Q15

-K1

18

17

28

17

-Q11 -Q13

-Q15

-Q11

-S14

MCS

P >

2

4

1

I

SW

Q

HAND

1

Q11

21

22

13

14

Q11

96

F2

0I

14

13

14

13

21

22

A

B

-S11

Moeller. Wiring manual. Automation and Power distribution

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