Alfa Laval LeviMag, Инструкция по эксплуатации, Страница: 38 / 68

7 ATEX specific conditions for safe use
7.3 Equipment Protection Level and safety devices
The Equipment Protection Level (EPL) must be realized and integrated completely in the ignition protection system according to
the directives 2014/34/EU, EN ISO 80079-36 and EN ISO 80079-37 §6.
The functions of these ignition protective systems must be checked before start-up according to the manual from the
manufacturer of the system.
The EPL for the monitoring must meet the demands of EN ISO 80079-37 §6. The functions of these systems must be checked
regularly by the user, according to the manual from the manufacturer of the system.
The reaction time of the ignition protection system must not exceed 0.5 seconds. The reaction time is the period between
reaching the shutdown value and until the power is shutoff the machine.
Ensure all electrical installations design in any classification zone are according to EN 60079-14.
7.4 Monitoring the frequency converter
The motor is controlled by a frequency converter. The manual from the motor manufacturer and the information in the certificate
for the motor shall be followed.
Temperature monitoring devices must meet the requirements in the directive 2014/34/EU and EN1127-1.
In addition to the speed of the mixer, the operating limits according to below scheme must not be exceeded.
If the operating limits are to be exceeded it can lead to an ignition source coming affective, either by the mixer loses the magnetic
coupling, resulting in mechanical contact to the wall, otherwise through a vortex or dry-running heat can buildup in the sealing
surfaces, resulting in exceeding the assigned temperature class of the product.
NOTE
The mixer can only operate with a frequency converter and therefore the speed of the mixer must be monitored.
Required measures of the end user to eliminate ignition hazards:
Zone 0 inside and zone 1 outside the tank - the speed of the mixer must be monitored with an EPL,
corresponding to b2 or two b1 according to EN ISO
80079-37 §6.
Zone 1 inside and outside the tank - the speed of the mixer must be monitored with an EPL,
corresponding to b1 according to EN ISO 80079-37 §6.
Zone 2 inside and outside the tank - no further measures need to be taken.
NOTE
Ensure the frequency converter is installed according to EN 60079-14 §11.2.
NOTE
By monitoring the frequency applied to the motor the speed of the mixer can be ensured.
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