Siemens 3RB20 Посібник - Сторінка 3

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Також для Siemens 3RB20: Інструкція з експлуатації Посібник з експлуатації (6 сторінок), Інструкція з експлуатації (4 сторінок), Довідковий посібник (46 сторінок)

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3RB20 and 3RB21 Motor protection devices

for potentially explosive areas

Safety and commissioning instructions

DANGER

Hazardous voltage.

Will cause death or serious injury.

Turn off power before working on this equipment.

CAUTION

Reliable functioning of the equipment is only ensured with

certified components.

1. General

Notes and standards

Due to the heightened risk in potentially explosive areas, the following

notes and standards have to be observed carefully:

• EN 60079-14 / VDE 0165-1 Electrical apparatus for explosive gas

atmospheres.

• EN 60079-17 Inspection and maintenance of electrical installations in

hazardous areas.

• EN 50495 Safety devices required for the safe functioning of

equipment with respect to explosion risks.

All 3RB20 and 3RB 21 electronic overload relays are authorized under

Device Group II, Category (2) for area "G" (areas in which explosive

gas, steam, fog and air mixtures are present) and additionally for area

"D" (areas with combustible dust). 3RB20 and 3RB21 devices are not

designed for use in hazardous areas. When used in potentially explo-

sive areas, 3RB20 and 3RB21 devices must be adapted according to

the respective ignition protection type.

PTB 06 ATEX 3001

WARNING

All connection, installation and maintenance work must be carried

out by qualified, responsible specialists. Improper behavior can

lead to severe personal injury or property damage.

2. Installation and Commissioning

NOTICE

Please observe the operating instructions (supplied with the

device)

• 3RB201 to 3RB204 and 3RB211 to 3RB214

(3ZX1012-0RB20-1AA1)

• 3RB205 / 3RB206 / 3RB215 / 3RB216

(3ZX1012-0RB20-1BA1).

2.1 Setting the motor rated current

Set the 3RB20 / 3RB21 to the rated current of the motor (according to

the name plate or the type approval certificate of the motor).

3ZX1012-0RB20-1CA1

II (2) G [Ex e] [Ex d] [Ex px]

II (2) D [Ex t] [Ex p]

CAUTION

Observe the trip class and the tripping characteristics of the

3RB20 / 3RB21. Select the trip class so that the motor is thermi-

cally protected even when the rotor stalls.

The motor, the lines and the contactors must be designed for the

selected trip class.

Example: Motor 500 V, 50 / 60 Hz, 110 kW, 156 A, temperature class

T3, T

-time = 18 s, I

/ I

= 5.0

=18s

2.2 Short-circuit protection according to EN 60947-4-1 for type of

coordination "2"

The short-circuit protection must be adopted from the separate

overcurrent protection devices.

NOTICE

In combination with other contactors please observe the respec-

tive maximum contactor protection for type of coordination "2".

2.3 Cable protection

NOTICE

Excessive surface temperatures of the cables and lines must be

prevented by dimensioning the cross sections accordingly.

An adequate cable cross section must be chosen for heavy

starting - CLASS20 and CLASS30 - in particular.

2.4 RESET

CAUTION

When the 3RB20 / 3RB21 is in the "Automatic RESET" mode, the

reset is carried out automatically at the end of the cooling time

without the RESET button being pressed. In this case, an addi-

tional ON button is necessary - as described in the operating

instructions - to prevent the motor from automatically starting up

again after being tripped. If the 3RB20 / 21 is used without a

separate thermistor protection when the overload release trips,

the motor can only be connected by a specialist.

The "Automatic RESET" mode may not be used in applications in

which an unexpected motor restart could lead to personal injury or

damage to property.

3RB20 / 3RB21

EN 1088 (5.7)

English

Tipping conditions of the

EEx motor

selected: CLASS 10E

/ I

=5,0