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4. TECHNICAL DATA
Basic technical parameters are given in Table 1.
Power supply
– nominal value of the AC voltage is
1 x 230 V or 3 x 400 V
(according to version)
– permitted power supply voltage tolerance is
-10 % to +6 % of the nominal value
– rated frequency of supply voltage is
50 Hz
– permitted power supply voltage frequency tolerance is
2% of the nominal value
Within this supply voltage range, all parameters are kept up except the starting torque which varies with the square
of the supply voltage deviation from the rated value. This dependence is directly proportional to the supply voltage
variation; no larger supply voltage and frequency fluctuations are permitted.
Protective enclosure
Protective enclosure of the
MODACT MOKPED Ex actuators is IP 67 according to ČSN EN 60529
(33 0330).
Noise
Level of acoustic pressure A
max. 85 dB
(A)
Level of acoustic output A
max. 95 dB
(A)
Tripping torque
At the factory, the tripping torque has been adjusted as shown in Table 1, according to the customer’s
requirements. If no tripping torque adjustment has been specified by the customer the maximum tripping torque is
adjusted.
Self-locking
Actuator self-locking capacity is provided by mechanical electric motor brake, at actuator type no. 52 320 by
mechanic gearbox brake.
Sense of rotation
When looking at the output shaft in the direction towards the control box, the CLOSE direction of rotation is identical
with the clockwise sense.
Working stroke
The working stroke of
MODACT MOKPED Ex actuator is 90°
(after agreement with the manufacturer actuators can
be supplied with working stroke 60 °, 120 ° or 160 °).
Manual control
The actuators are controlled by a hand wheel directly
(without a clutch)
and control is possible even during
operation of the electric motor. When rotating the hand wheel in clockwise direction, the actuator’s output shaft also
rotates in clockwise direction
(looking at the local position indicator).
Handwheel direction of rotation is also indicated
on the label of the handwheel.
Torque-limit switches in the actuator are set and work when the actuator is under voltage.
When using the manual control, ie. actuator is controlled mechanically, the torque-limit switches doesn´t
work and the valve can be damaged.
5. ACTUATOR OUTFIT
Position indicator
The actuator can be fitted with a display as an option for
DMS2 ED electronic system. Actuator with DMS2 electronic
system is equipped with two-line display.
Heating element
Actuators are equipped with a heating element to prevent water vapour condensation. As a heating element they
apply resistors TRA 25 10 K/J with an output of 25 W and resistance of 10 k
Ω
. They are switched by a switch for the
heating resistor located on the source circuit board. It is possible to use a computer to set the switching temperature
in the range of -40 to +70 °C. Permanent heating can reliably be ensured by the temperature s70 °C. Maximum
heating current of the switch is 0.4 A/230 V.
