The power consumption varies depending on whether the actuator is in standby
mode or is running, see Table 5: System performance parameters for QT250
and QT800 actuators on page 19.
Eltorque actuators may be used according to IEC 60034-1 duty type S2
Industrial Valves – Actuators, chapter 4.7:
For class A – ON/OFF operation, duty performance is defined as the minimum
number of cycles per hour, where “one cycle consists of nominal 90° angular
travel in both directions (i.e. 90° to open + 90° to close), based on an average
load of at least 30 % of the rated torque with the ability to transmit 100 % of the
rated torque for at least 5 % at each end of travel, with a cumulative operating
time not exceeding 15 minutes in one hour.” (EN 15714-2, chapter 4.7.2.2, a.).
For class B – inching/positioning, duty performance is defined as the minimum
number of starts per hour, where “one start consists of a movement of at least 1°
in either direction, with a load of at least 30 % of the rated torque. The cyclic
duration factor (i.e. the ratio between the running period and total period)
shall be not less than 25 % (e.g. 1 s. running and 3 s. resting)” (EN 15714-2,
chapter 4.7.2.2, b.)
For classes C and D – modulating and continuous modulating, duty performance
is defined as the minimum number of starts per hour, where “one start consists
of a movement of at least 1°. In either direction, with a load of at least 30 % of
the rated torque” (EN 15714-2, chapter 4.7.2.2, c.).
Rotating electrical machines, chapter 4.2:
Duty type S2: “Operation at constant load for a given time, less than that
required to reach thermal equilibrium, followed by a time de-energized and at
rest of sufficient duration to re-establish machine temperatures within 2 K of the
coolant temperature.” (IEC 60034-1, chapter 4.2.2)
Eltorque actuators may be used classes A and B – 10 000 cycles per lifetime.
Endurance is defined according to EN 15714-2, chapter 4.1 and Annex A.
For classes A and B – ON/OFF operation and inching/positioning, endurance
defines the minimum number of cycles to be endured per life time, where “one
cycle consists of nominal 90°. Angular travel in both directions (i.e. 90° to open +
90° to close), based on an average load of at least 30 % of the rated torque with
the ability to transmit 100 % of the rated torque for at least 5 % at each end of
travel, with a cumulative operating time not exceeding 15 minutes in one hour.”
(EN 15714-2, chapter 4.1.2, b.)
For class B – inching/positioning, duty performance is defined as the minimum
number of starts per hour, where “one start consists of a movement of at least 1°
in either direction, with a load of at least 30 % of the rated torque.
The cyclic duration factor (i.e. the ratio between the running period and total
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