6 Technical data
All dimensions in mm unless otherwise stated.
6.7
Use of frequency converter drive (VLT)
CAUTION!
The speed of the agitator must be monitored if frequency converter drive (VLT) is installed to regulate the speed.
When 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 additional for the speed of agitator EnSaFoil, the operating limits “Critical speed” according to the ATEX addendum must
not be exceeded.
NOTE!
The build in function in the frequency converter cannot be used for that.
If the operating limits is to be exceeded it can lead to an ignition source coming affective, either by large deflection of the
shaft, resulting in mechanical contact to the tank wall, or by heat buildup in the mechanical shaft seal, resulting in exceeding
the assigned temperature class of the product.
Equipment protective level / safety devices
The Equipment protective level (EPL) has to be realized and integrated completely in the ignition protection system according to
the Directives 2014/34/EU, EN ISO 80079-37, §6 and EN ISO 80079-36. The system shall be evaluated and may marked “b2”
according to EN ISO 80079-37, §6.
The functions of these ignition protective systems have to be checked before start-up according to the manual from the
manufacturer of the system.
The Equipment protection level (EPL) for the monitoring have to meet the demands of EN ISO 80079-37, §6. The functions of
these systems have to 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 2 seconds.
- The reaction time is the period between reaching the shut-down value and until the power is shut-off of the machine.
Required measures of the end user to eliminate ignition hazards:
-
With a zone 0/20 inside the tank and zone 1/21 outside, the speed of the agitator has to be monitored with an EPL,
corresponding to b2 or two b1 according to EN ISO 80079-37, §6.
-
With a zone 1/21 inside and outside the tank the speed of the agitator has to be monitored with an EPL, corresponding
to b1 according to EN ISO 80079-37, §6.
-
With a zone 2/22 inside and outside the tank no further measures needs to be taken.
If the agitator is supplied with an incremental encoder attached to the motor shaft, it may be used as one of the two independent
control measure devices b1. In regard to b2 a second control measure device must be applied and the complete EPL must be
assessed acc. to the Directives 2014/34/EU, EN ISO 80079-37, §6 and EN ISO 80079-36.
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