10
c) The servo motor is equipped with gland outlet for sealing the supply cable, to which two rubber packing
rings are supplied with the 23 and 26 mm openings. To seal the cable a sealing rubber ring is used accor-
ding to the actual cable diameter. One ring is placed in the seal outlet, the other is located in the terminal
box.
10. OPERATION
Correct operation of the
MODACT MOA OC actuators is determined by operational conditions and is usually
limited to giving impulses for the various functional tasks. If necessary
(e.g. during adjustment of the actuator)
change the position of the controlled member by means of the hand wheel. The hand wheel is placed into engagement
by means of the lever located on the side of the power cabinet. It is necessary to press the lever towards the valve
and simultaneously rotate the hand wheel into such position that the clutch and the handwheel teeth are mutually
engaged.
Operating personnel must ensure that the prescribed maintenance is carried out and that the actuator is
protected against harming ambient impacts and weather conditions unspecified in section
“Operating conditions
parameters”.
11. MAINTENANCE
If the oil does not flow from the power cabinet due to bad sealing, the oil charge is stable. Checking of oil and
refilling is carried out after two years. Oil charge should be changed after four years. The actuator is filled with
PP 90 oil.
The amount of oil is shown in the following table:
Every four years it is necessary to lightly coat the teeth of the gear assemblies and rotary seats in the control cabinet with
CIATIM 221 grease.
To increase the corrosion resistance also grease springs in the control cabinet. Grease must not be applied on the sliing seats
in the torque unit.
In all inspections and maintenance it is necessary to properly tighten all the nuts and bolts that have an impact on the creation
of sufficient pressure on the rubber sealing, ensuring hermetic tightness of the actuator.
Troubleshooting
Actuator is in its end position, does not start up, motor buzzes. Make sure that all electric motor terminals
(terminals 1,
2, 3)
are energized. In the event that the slider is blocked so that it cannot be released with a hand wheel or a motor, it is
necessary to dismantle the actuator from the valve and release the spindle nut mechanically.
Operating and safety requirements
– It is forbidden to operate the electric actuator, if it is not provided with passport or installation instructions.
– Interval between two preventive inspections is four years.
– When installing the electric actuator it is necessary to ensure the safety conditions needed for performing inspections,
repairs and manual control.
– It is prohibited to use electric actuator with parameters or in the environments exceeding the values defined in this
installation manual. It is forbidden to use these actuators in control mode.
– It is forbidden to dismantle, maintain and treat the equipment, unless it the electric actuator is disconnected from the mains.
– During the operation, maintenance and repairs of the actuator the actuators must be properly grounded
(unless it
is a repair of the actuator that has been properly disconnected from the mains by unplugging the power supply
cable).
2
3
4.8
52 070
52 071
52 072
52 074
Oil quantity in kg
Type number
