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The instructions for assembly and operation lay down basic principles of fitting, connection, adjustment, operation,

maintenance and repairs of electric explosion-proof actuators. The principle assumption is that assembly, operation,
maintenance, and revisions are carried out by skilled experts authorized for operation of and works on explosion-proof
electric installations, and professional supervision is performed by a person professionally qualified and demonstrably
instructed.

APPLICATION

MODACT MOKP Ex

electric actuators in non-explosive version are intended for control and operation in an environment

with danger of explosion of explosive gaseous atmosphere in zone 1 and zone 2 according to ČSN EN 60079-10-1, and for
areas with flammable dust in zone 21 and zone 22 according to ČSN EN 60079-10-2. The actuators are designed in compliance
with the standards ČSN EN 60079-0:2010 a ČSN EN 60079-1:2008 for explosive gaseous atmosphere and with the standard
ČSN EN 60079-31:2010 for areas with flammable dust.

The actuators are used for control of fittings by reverse rotation movement in remote control and automatic control circuits.

They can be used for other appropriate units as well. Special applications should be discussed with the manufacturer.

Actuators

MODACT MOKP Ex Control

are fitted with an electronic position controller and, in case of the three-phase

version, also with a built-in reversing contactor and a protecting thermal relay. They serve as power terminal elements of
control circuits in regulating physical variables.

The actuators are marked with a label of protection against explosion and symbols of the group and category of the device

according to the type of certification as follows:

II 2GD

Ex d IIC T6 Gb

-25 ≤ Ta ≤ 55 °C

Ex d IIB T6 Gb

-50 ≤ Ta ≤ 55 °C

Ex tb IIIC T80 °C Db

-50 ≤ Ta ≤ 55 °C

Nomenclature

Environment with a risk of explosion

– environment in which explosive atmosphere can be formed.

Explosive gaseous atmosphere

– mixture of flammable substances

(in the form of gases, vapours or mist)

with air under

atmospheric conditions in which, after initialization, combustion spreads into the non-consumed mixture.

Explosive dust atmosphere

– a mixture of flammable substances in the form of dust or fibres with air under atmospheric

conditions where, after ignition, the fire spreads into the non-burnt-out mixture.

Maximum surface temperature

– the highest temperature created during operation under the most unfavourable conditions

(however within accepted tolerances)

on any part of surface of an electric device which could cause ignition of the surrounding

atmosphere.

Closure

– all walls, doors, covers, cable bushings, shaft, bars, pull rods, etc. contributing to the type of protection against

explosion and/or to the degree of protective enclosure

(IP)

of the electric device.

Explosion-proof closure “d”

– type of protection in which parts capable of igniting explosive atmosphere are installed

inside this closure; in case of explosion of the explosive mixture inside the closure, this closure withstands pressure of
explosion and prevents transferring explosion into the surrounding atmosphere.

Zone 1

– is an area in which, in normal operation, probability of occurrence of explosive atmosphere of a mixture of flammable

substance in the form of gas, vapour or mist with air is occasional.

Zone 21

– is an area in which the explosive atmosphere is created by a cloud of whirled flammable dust in air formed

in normal operation is occasional.

Standards

The following basic standards are related to the explosion-proof actuators:

ČSN EN 60 079-14

Regulations for electric devices in areas with a risk of explosion of flammable gases and vapours.

ČSN IEC 60 721

Types of environment for electric devices.