07_LH4_N1_N2_soft_starters_cat.pdf

Soft starters

Selection guide

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Applications

Starting simple machines

Power range for 50…60 Hz supply (kW)

0.75…11

1.1…75

Single phase 208…240 V (kW)

0.75…3

–

3-phase 208…240 V (kW)

1.1…5.5

1.1…22

3-phase 230…415 V (kW)

–

3-phase 380…415 V (kW)

3…11

3…45

3-phase 440…480 V (kW)

3…11

3…45

3-phase 440…500 V (kW)

–

3-phase 208…690 V (kW)

–

7.5…75

Output frequency

50/60 Hz

Control profile

Voltage ramp

Energy saving

Integrated bypass

Communication

Integrated serial link

–

Industrial buses and networks

–

AS-i

Degree of protection

IP 20

Dialogue

2 integrated LEDs

PowerSuite software workshop

Incompatible

References

LH4 N1

LH4 N2

Pages

24075/2

Schneider Electric

Presentation

Soft starters

LH4 soft start units - open version

Presentation

Asynchronous motors are widely used because they are robust, reliable, standardised and inexpensive. Starting this type

of motor has always required a careful compromise between the cost of the starter unit and performance:

- torque peaks which may damage the mechanics,

- current peaks on power up,

- significant line voltage drops.

The LH4-N1 starting torque controller is used for single-phase and 3-phase motors whenever surges caused on starting

need to be suppressed. It can only be used with low-power motors.

The LH4-N2 soft start - soft stop unit can be used to control starting torque and soft stops, while significantly reducing

starting current.

LH4-N244Q7

Principle, use

Unlike electromechanical starters, LH4 electronic starters can be used to adjust starting torque, thus eliminating

mechanical shocks which result in increased wear, maintenance and production downtime.

LH4-N1 soft start units are recommended for use with conveyors, conveyor belts, fragile or noisy automatic doors, drag

lifts, small gantries such as those used in car washes and all machines equipped with drive belts.

LH4-N2 soft start - soft stop units are used for fans, pumps, cold compressors, compressed air equipment and all types

of high inertia machinery. On machines which do not require electrical isolation, they eliminate the need for a line

contactor.

LH4-N2 units, which give higher performance, can be used instead of LH4-N1 units.

Operation

LH4 soft start units start with reduced voltage. The voltage rises gradually until it reaches its rated value. This reduces

torque surges which can be harmful both to the motor and to the mechanism being driven, and also reduces starting

currents (with the LH4-N2).

The user can adjust the starting torque using one of the LH4 potentiometers.

Starting time can also be adjusted via the second potentiometer.

The motor connected to the LH4 must be able to start the load at reduced voltage.

A third potentiometer on LH4-N2 units can be used to adjust deceleration time.

LH4-N285Q7

On the LH4-N2, a relay, which indicates product faults and can be used to control the line contactor (isolation), gives a

signal when the product is operating. This signal can be used to control the line contactor.

Once the starting process has finished, a relay or contactor integrated in the LH4 shunts the electronics limiting

electromagnetic interference and temperature rises. This contactor drops out on the stop request, whether deceleration

takes place or not.

For the LH4-N230 rating and above, end of starting data can be obtained by adding an attachment which can be mounted

on the electronics shunting contactor without dismantling the product.

Description of the range

The range of LH4-N soft start units comprises 2 product families:

- LH4-N1 units, comprising 3 ratings from 6 to 22 A,

- LH4-N2 units, comprising 7 ratings from 6 to 85 A.

The following products are designed for 3-phase voltages (the LH4-N1 can also operate in single phase):

- 230, 400 and 460 V at 50 or 60 Hz for ratings up to 22 A,

- 200 to 690 V and 400 V at 50 or 60 Hz for ratings from 32 to 85 A.

The maximum power for start units, at an operating voltage of 400 V, is 45 kW.

Adjustments and start-up

All start and stop units have 2 potentiometers which can be used to:

- adjust acceleration time,

- obtain the starting torque required for an immediate start following the run signal.

On LH4-N2 units, there is a third potentiometer for adjusting deceleration time.

These functions can be sealed to avoid the risk of settings being lost.

Characteristics:

page s 24071/3 t o 24071/5

References:

pa ges 24075/2 and 24075/3

Dimensions:

page 24076/2

Schemes:

pa ges 24076/3 to 24076/5

24071-EN_Ver4.2.fm/2

Schneider Electric

Characteristics

Soft starters

LH4 soft start units - open version

Environment

Rated insulation voltage (Ui)

Conforming to IEC 947

690

Rated impulse withstand

voltage (Uimp)

Conforming to IEC 947

6 and 8 for LH4-N2ppLY7 products

Conforming to standards

IEC 60947-4-2

Product certifications

ECC (low voltage and EMC) - UL - CSA

Degree of protection

IP 20 (front panel)

Maximum relative humidity

93 % without condensation or dripping water

Maximum ambient pollution

Degree 3 conforming to IEC 664-1 and UL 508

Ambient air temperature

For operation

° C

0…+ 40 with derating of 1.2 % per °C above 40 °C and up to 60 °C

around the device

0...+ 55 for LH4-N2 from 32 A.

For storage

° C

- 25…+ 70

Maximum operating altitude

2000 - (above this, derate the power by 0.5 % for each additional 100 m)

Operating positions

Without derating

± 30° in relation to the vertical for permanent operation, any position for

temporary operation.

Shock resistance

Conforming to IEC/EN 68-2-27

8 gn, 11 ms

Vibration resistance

Conforming to IEC/EN 68-2-6

2gn

Immunity to radiated