4 ST 1, STR 1
1.5.1 Lifetime of actuators
The lifetime of an electric actuator (EA) is at least 6 years.
EA used for closing mode (closing valves) comply with the requirements for at least 15,000 working cycles
(cycle C – O – C: for linear EA).
EA used for regulating/modulating operation (control valves) comply with the below stated numbers of operating
hours at the total number of 1 million start-ups:
Switching frequency
max. 1,200 [h
-1
] 1,000 [h
-1
] 500 [h
-1
] 250 [h
-1
] 125 [h
-1
]
Minimal lifetime expectancy – number of operating hours
850 1,000 2,000 4,000 8,000
Time of net operation is min. 200 hours, max. 2,000 hours.
Lifetime at operating hours depends on loading and switching frequency.
Note : High switching frequency does not ensure better regulation. Setting of regulation parameters should be
therefore made with the inevitably necessary switching frequency needed for the process in question.
1.6 Operation conditions
1.6.1 Product location and operation position
Electric actuators may be installed and operated in enclosed locations of industrial facilities with no
temperature and moisture regulation, protected from direct climatic effects (such as direct sunlight). Moreover,
special “marine” versions may be used in waste water treatment applications, water management, selected
chemical applications, tropical environments and coastal areas.
Installation and operation of EA is possible in any position. Vertical position of output part axis and with
the control part above the valve is usual. Electric actuator position under the valve not recommended.
Warning:
When the EA is installed in open air, it must be sheltered lightly to protect is against direct effects of
atmosphere.
When installed in the areas with relative humidity more than 80%, in open air under a shelter is
needed to connect the space heater directly – without a thermal switch.
1.6.2 Operation environment
According to valid standard IEC 60 721-2-1, there are delivered these versions of electric actuators:
1) Version „temperate“ for type climate temperate
2) Version „cold“ - for type climate cold
3) Version „tropical“ for type climate tropical and dry
4) Version „marine“for type climate marine.
In accordance with IEC 60 364-1, IEC 60 364-5-51 and IEC 60 364-5-55 within valid edition the EA have to
resist external effects and operate reliably:
In the conditions of the following types of environment:
• warm mild to very hot dry with temperature in range -25°C to +55°C.....................................................AA 7*
• cold, warm mild to hot dry with temperatures -50°C to 40°C...................................................................AA 8*
• with relative humidity 10 to 100 %, including the condensation of up to 0,029 kg water content per 1 kg of dry
air at 27 °C, with temperatures from -25°C up to +55°C ..........................................................................AB 7*
• with relative humidity of 15÷100%, including the condensation of up to 0,036 kg water content per 1 kg of dry
air at 33 °C direct exposed to a possible rainfall, with temperatures from –50°C up to +40°C ...............AB 8*
• with height above sea level 2 000 m, with barometric pressure range 86 to 108 kPa .............................AC 1*
• with spraying or jet water from all directions–(protection enclosure IP x5)...............................................AD 5*
• with shallow dive – (product in protection IP x 7)......................................................................................AD 7*
• with strong dustiness – with a possibility of influences of inflammable, non-conducted and non-explosive
dust; the middle layer of dust; the dust drop more than 350 but not more than 1000 mg/m
2
per day (products
with protection enclosure of IP 6x.............................................................................................................AE 6*
• with atmospheric occurrence of corrosive and pollution media (with high degree of atmosphere corrosive
aggressiveness); important presence of corrosive pollution .....................................................................AF 2*
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