Moeller. Wiring manual. Automation and Power distribution

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Electronic motor starters and drives

Connection examples, DS4

Moeller Wiring Manual 02/05

2-47

S3 = Soft start/stop

Q1 = Line protection

Q21 = Bypass contactor

F1 = Overload relay

F2 = Semiconductor fuse for type “2” coordination, in addition to Q1

T1 = Semiconductor contactor

M1 = Motor

1L1

5L3

3L2

2T1

6T3

4T2

TOR

I I I

Q21

Electronic motor starters and drives

Connection examples, DS4

Moeller Wiring Manual 02/05

2-48

Pump connection, single direction of rota-

tion

In pump applications the bypass contactor is often

required to provide emergency operation

capability. This is achieved with a service switch

that allows a changeover from soft starter

operation to DOL starting through the bypass

contactor. In the latter setting the soft starter is

fully bypassed. But because the output circuit

must not be opened during operation, the

interlocks ensure that changeovers take place only

after a stop.

Note:

In contrast to simple bypass operation, the bypass

contactor must be laid out to AC3 here. For a

suitable contactor, see our recommended mains

contactor in appendix “Technical data”.

Pump

Q1: Line protection

Q11: Mains contactor (optional)

Q21: Bypass contactor

Q31: Contactor

F1: Overload relay

F2: Semiconductor fuse for type “2”

coordination, in addition to Q1

T1: Semiconductor contactor

M1: Motor

Q11

1L1

5L3

3L2

2T1

6T3

4T2

TOR

I I I

Q21

Q31

Electronic motor starters and drives

Connection examples, DS4

Moeller Wiring Manual 02/05

2-49

Pump control

n Emergency-Stop

a t > t-Stop + 150 ms

b Enable

c Hand

d Auto

e Soft start/soft stop

f RUN

g Bypass

T1K5

S5 K5 K5

K6t

Q21

T1 TOR K2

Q11

Q31

K3 K4

T1K1

Q21

K6t

cd e f g

Electronic motor starters and drives

Connection examples, DS4

Moeller Wiring Manual 02/05

2-50

Starting several motors sequentially with a

soft starter (cascaded control)

When starting several motors one after the other

using a soft starter, keep to the following

changeover sequence:

• Start using soft starter

• Switch on bypass contactor

• Disable soft starter

• Switch soft starter output to the next motor

• Restart

a page 2-52

n Emergency-Stop

S1: Q11 Off

S2: Q11 On

a Soft start/soft stop

b Simulation of RUN relay

Timing relay K2T simulates the RUN signal of

the DS4. The set off-delay time must be

greater than the ramp time. To be on the safe

side, use 15 s.

c RUN

d Off-time monitoring

Set the timing relay K1T so that the soft starter

is not thermally overloaded: calculate the time

from the soft starter’s permissible operating

frequency or select a soft starter that allows

the required time to be reached.

e Changeover monitoring

Set the timing relay to a return time of about

2 s. This ensures that the next motor branch

can not be connected as long as the soft

starter is running.

a page 2-53

i Switching off individual motors

The Off switch results in all motors being switched

off at the same time. To switch off individual

motors, you need to make use of N/C contact i.

Observe the thermal load on the soft starter

(starting frequency, current load). If motors are to

be started at short intervals, you may have to

select a soft starter with a higher load cycle.

Electronic motor starters and drives

Connection examples, DS4

Moeller Wiring Manual 02/05

2-51

Soft starters with motor cascade

1L1

2L2

3L3

2T1

4T2

6T3

Q21

Q23

Q11

Q22

Q31

Q33

Q32 Qn

Qn3

TOR

I> I> I> I> I> I>

Q11 = Mains contactor (optional)

F2 = Semiconductor fuse for type “2” coordination

T1 = Soft starter

M1, 2,... = Motor

Electronic motor starters and drives

Connection examples, DS4

Moeller Wiring Manual 02/05

2-52

Soft starter with motor cascade, control section part 1

adc

K2T

K1T K4T

T1 TOR

S2 K1

Q21

Q31

K1T

K1 K4 K12 K22

Qn1

Kn2

K2T

Q11

Electronic motor starters and drives

Connection examples, DS4

Moeller Wiring Manual 02/05

2-53

Soft starter with motor cascade, control section part 2

a Motor 1

b Motor 2

c Motor n

i a section “i Switching off individual motors”, page 2-50

Q21

Q22

K12

Q11

Q21

K12

Q31

Q32

K22

K12

Q31

Q21

K22

K4T

QmQm

Kn2

K(n-1)2

Q(n-1)1

Kn2

K4T

Moeller Wiring Manual 02/05

2-54

Electronic motor starters and drives

Connection examples, DM4

Enable/immediate stop without ramp function (e.g. for Emergency-Stop)

The digital input E2 is programmed in the factory

so that it has the "Enable" function. The soft

starter is enabled only when a High signal is

applied to the terminal. The soft starter cannot be

operated without enabling signal.

In the event of wire breakage or interruption of

the signal by an Emergency-Stop circuit, the

regulator in the soft starter is immediately blocked

and the power circuit disconnected, and after that

the "Run“ relay drops out.

Normally the drive is always stopped via a ramp

function. When the operating conditions require

an immediate de-energization, this is effected via

the enabling signal.

Caution!

You must in all operating conditions always first

stop the soft starter ("Run“ relay scanning),

before you mechanically interrupt the power

conductors. Otherwise a flowing current is

interrupted – thus resulting in voltage peaks,

which in rare cases may destroy the thyristors of

the soft starter.

n: Emergency-Stop

S1: Off

S2: On

T1: (E2 = 1 a enabled)

Electronic motor starters and drives

Connection examples, DM4

Moeller Wiring Manual 02/05

2-55

Linking the overload relay into the control system

We recommend using an external overload relay

instead of a motor-protective circuit-breaker with

built-in overload relay. This allows controlled

ramping down of the soft starter through the

control section in the event of an overload.

Caution!

Connecting the motor directly to mains power can

cause overvoltage and destruction of the soft

starter’s semiconductors.

There are two options, which are shown in the

following diagram:

n: Emergency-Stop

S1: Off

S2: On

T1: Enable (E2 = 1 h enabled)

a The signalling contacts of the overload relay

are linked into the On/Off circuit. In the event

of a fault, the soft starter decelerates for the

set ramp time and stops.

b The signalling contacts of the overload relay

are linked into the enabling circuit. In the

event of a fault, the soft starter’s output is

immediately de-energized. Although the soft

starter shuts off its output, the mains

contactor remains energized. To de-energize

the mains contactor as well, include a second

contact of the overload relay in the On/Off

circuit.

T1K1

S2 K1

Electronic motor starters and drives

Connection examples, DM4

Moeller Wiring Manual 02/05

2-56

DM4 with overload relay

Standard connection

For isolation from the mains, either a mains

contactor upstream of the soft starter or a central

switching device (contactor or main switch) is

necessary.

Control section

1L1

2L2

3L3

2T1

4T2

6T3

Q11

I> I> I>

+ Thermistor

– Thermistor

S1: Soft start

S2: Soft stop

a Enable

b Soft start/Soft stop

T1K1