HYDRAULIC CONTROL PANEL (HCP)
The control panel for control valves consists of:
N° 2 SV proportional valves (steam and desuper. control valves),
supplied with built-in electronic circuits
ON-OFF, two-position solenoid valves (EV), to perform emergency
actions (fast opening < 1 sec)
The HCP houses also analogue positioning cards (steam valves and
desuperheating valves) for stroke control in closed loop system.
The response time of ON-OFF valves may be separately adjusted by
suitable throttling devices.
The hydraulic circuit should be provided with gate valves to allow
Complete cycles are allowed, when pumps are still, within 15
minutes from pump stop, because of leakages.
ON-OFF valves for fast closing < 3 sec
ELECTRIC CONTROL CABINET
The electric control cabinet is supplied with a redundant
feeder/transformer for auxiliary circuits (240 Vac 24 Vdc), warning
lights, lamps, contactors and any other necessary component to
grant the efficiency of the whole hydraulic equipment.
The cabinet, fitted with a fan (extractor) complete with
replaceable cartridge, includes an auxiliary electrical socket .
Manufactured according to the industrial standards, with minimum
protection degree IP42, houses the control system for emergency
solenoid valves and 1 PLC to manage the Hydraulic Power Unit, the
Control Panel and the interchange signals with control room.
The cabinet houses also analogue positioning cards (steam valves
and desuperheating valves) for stroke control in closed loop
Auxiliary circuits are separately protected, even when redundant
(pumps control, PLC power supply and proportional valves).
Cable entry from bottom.
Max cable run from cabinet to control panel approx. 200 m.
Max resistance of proportional valves supply cable 2 W.
Approximate sizes 1200 x 2000 (+ 100) x 600 mm.
PLC CONTROL FUNCTIONS
The HPU is managed by one PLC, located inside the electric cabinet.
The PLC manages failure and emergency signals as well as pump
The PLC is provided with display and keyboard allowing to check
programmed parameters on site, and to modify them if required.
The access to parameter modification is protected by password.