5
Service life of actuators
The actuator designed for shut-off valves must be able to perform at least 10,000 working cycles (Close-Open-Close).
The actuator designed for regulation purposes must be able to perform at least 1 million cycles with running time (when the
output shaft is moving) at least 250 hours. Service life in operating hours (h) depends on loading and number of switching
actions. High frequency of switching is not always beneficial for precision of regulation. For reaching the longest possible
faultless period and service life, it is recommended to set frequency of switching to the lowest possible number of switching
actions necessary for the given process. Orientational data of service life derived from the set regulation parameters are shown
in the following table.
Service life of electric actuators for 1 million starts
Service life [h]
830
1 000
2 000
4 000
Number of starts [1/h]
Max. number of starts 1200
1 000
500
250
4. TECHNICAL PARAMETERS
Supply voltage
Supply voltage of electric motor
– 1 x 230 V +10 %, -15 %, 50 Hz ±2 %
– 3 x 230/400 V, +10 %, -15 %, 50 Hz ±2 %
(orasshownonthemotorratingplate)
Protective enclosure
Protective enclosure of actuators
– IP 67 according to ČSN EN 60529.
Noise
Level of acoustic pressure A
max. 85 dB
(A)
Level of acoustic output A
max. 95 dB
(A)
Tripping torque
Tripping torque is set at the manufacturer according to the customer's requirements within the range given in Table No. 1.
If setting of tripping torque is not required maximum tripping torque of the required type number of the electric actuator is set.
Breakaway torque
Breakaway torque is a calculated value, determined by electric motor’s breakaway torque, actuator's total ratio and
effectiveness. Actuator can produce breakaway torque after run reversing operation for 1 to 2 revolutions of the output
shaft, while torque tripping is interlocked. This may occur either in end position or in any optional intermediate position.
Self-locking
Actuator is self-locking provided that load acts against the motion of the actuator's output shaft. Self-locking function
is provided by a roller lock, which immobilizes actuator’s rotor even in case of manual operation.
With respect to safety regulations, it is unacceptable to apply actuators for operating transport lifting equipment
with possible transport of persons, or for equipment where persons may be present below the lifted load.
Run time N
Idle time R
Cycle time
Courseofworkingcycle
Mz starting torque ≥ 1.3 Mv
Mstř mean value of loading torque
Mv maximum value of tripping torque
