4
Classes of external influences
– as extracted from ČSN Standard 33 2000-5-51 ed. 3.
Class:
1) AC1
– Altitude ≤ 2,000 m above sea level
2) AD5
– Spouting water; water can spout in any direction
AD7
– Shallow dipping; possibility of occasional partial or complete covering
(for the type MTP only)
3) AE4
– Light dustiness
AE6
– Heavy dustiness,
(MTP only)
4) AF2
– Corroding atmosphere and pollutants; the presence of corroding pollutants is significant
5) AG2
– Average mechanical stress; in current industrial plants
6) AH2
– Medium vibrations; in current industrial plants
7) AK2
– Serious risk of growth of vegetation and moulds
8) AL2
– Serious danger of the occurance of animals
(insects, birds, small animals)
9) AM2-2 – Normal level of signal voltage. No additional requirements.
10) AN2 – Medium solar radiation with intensities > 500 W/m
2
and ≤ 700 W/m
2
11) AP3
– Medium seismic effects; acceleration > 300 Gal ≤ 600 Gal
12) BA4
– Personal abilities; instructed people
13) BC3 – Frequent contact with the earth potential; persons coming frequently into contat with “live” parts or
standing on a conducting base
Operating position
The actuators
MODACT MTN, MTP, type no. 52 442, 52 443 can be used in any operating position.
3. OPERATION MODE, SERVICE LIFE OF ACTUATORS
Operation mode
According to ČSN EN 60 034-1, actuators can be operated in S2 load category
(the course of load is
shown in the picture).
The operation time at +50 °C shall be 10 minutes, the average mean load thrust value
shall be below or equal to 60 per cent of the maximum tripping thrust Fv. According to ČSN EN 60 034-1, the
actuators can also be operated in the S4 mode
(interrupted operation with acceleration intervals).
The load
factor N/N+R shall be maximum 25 per cent, the longest operation cycle N + R is 10 minutes. The maximum
number of switching actions in automatic control mode is 1200 actions per hour. The average mean load thrust
at load factor of 25 per cent and 50 °C shall not exceed 40 per cent of the maximum tripping thrust Fv.
The maximum average mean of the load thrust equals the rated thrust of the actuator.
Corrosion protection
Actuators are standardly delivered with surface treatment corresponding to category of corrosion aggressiveness
C1, C2 and C3 according to ČSN EN ISO 12944-2.
On customer's request is possible to do surface treatment correcponding to category of corrosion aggressiveness
C4, C5-I and C5-M.
In following table is provided and overview of environment for each categories of corrosion aggressiveness accor-
ding to ČSN EN ISO 12944-2.
Corrosion
aggressiveness
level
Example of typical environment
Outdoor
Indoor
C1
Heated buildings with clean atmosphere
(very low)
e.g. offices, shops, schools, hotels.
C2
Atmosphere with low level of pollution.
Unheated buildings, in which may occur
(low)
Mostly outdoor areas.
condensation, e.g. stocks, sports halls.
C3
Urban industrial atmospheres,
Production areas with high humidity and low air
(middle)
mild pollution of sulfur dioxide.
pollution, e.g. food industry, processing
Seaside areas with middle salinity.
factories, breweries.
C4
Industrial areas and seaside areas
Chemical plants, swimming pools,
(high)
with middle salinity.
seaside shipyard.
C5-I
(very high
Industrial areas with high humidity
Buildings or areas with predominantly continuous
– industrial)
and aggressive atmosphere.
condensation and high air pollution.
C5-M
(very high
Seaside areas with high salinity.
Buildings or areas with predominantly
– seaside)
continuous condensation and high air pollution.
