STI S.r.l. – Via Dei Caravaggi 15, 24040 Levate (BG) – ITALY www.imi-critical.com
Manual 5020, rev.03 07/2021 - SC/VHS 14
7 Instructions for the operator
7.1 Start Up
During the start-up of the actuator, proceed as follows:
- Check that the pressure and quality of the hydraulic fluid (filtering degree,….) are as prescribed.
- Check that the feed voltage values of the electric components (solenoid valve coils, micro-
switches, pressure switches, etc.) are as prescribed.
- Connect the actuator to the hydraulic feed line with fittings and tubing in accordance to project
specifications. They must be sized correctly in order to guarantee the necessary oil flow for the
operation of the actuator, with pressure drops not exceeding the maximum allowable value. The
shape of the connecting piping must not cause excessive stress to the inlets of the actuator. The
piping must be suitably fastened so as not to cause excessive stress or loosening of threaded
connections, if the system undergoes strong vibrations.
- Every precaution must be taken to ensure that any solid or liquid contaminants, which may be
present in the hydraulic pipework to the actuator, are removed to avoid possible damages to the
unit or loss of performance.
- The inside of the pipes used for the connections must be well-cleaned before use: wash them
with suitable substances and blow through them with oil or nitrogen. The ends of the tubes must
be well deburred and cleaned.
- Connect the electrical feed, control and signal lines to the actuator, by linking them up with the
terminal blocks of the electrical components. In order to do this, the housing covers must be
removed without damaging the coupling surfaces, the O-rings or the gaskets.
- Remove the plugs from the cable entries.
- For electrical connections use components (cable glands, cables, hoses, conduits) in line with
project and hazardous area requirements and codes applicable to the plant specifications
(mechanical protection and/or explosion-proof protection).
- Screw the cable glands tightly into the threaded inlets, so as to guarantee the weatherproof and
explosion-proof protection (if applicable).
- Insert the connection cables into the electrical enclosures through the cable glands, and connect
the cable wires to the terminals according to the applicable wiring diagram.
- If conduits are used, it is advisable to carry out the connection to the electrical enclosures by
inserting hoses so as not to cause anomalous stress on the housing cable entries.
- Replace the plastic plugs of the unused enclosure entries by metal ones, to guarantee perfect
weatherproof tightness and to comply with the explosion-proof protection codes (where
applicable).
Once the connections are completed:
- check that the actuator controls work properly (remote control, local control, emergency controls,
etc.)
- operate the actuator and check that it functions correctly, that the operation times meet the plant
requirements and that there are no leakages in the hydraulic connections. If necessary tighten
the nuts of the pipe fittings.
- Check that the required remote signals (valve position, oil pressure, etc.) are correct.
- Check that the setting of the components of the actuator control unit (pressure regulator, pressure
switches, flow control valves, etc.) meet the plant requirements.
- Remove all rust and, in accordance with the applicable painting specifications, repair paint-coat
that has been damaged during transport, storage or assembly.
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