Pumping units control system cabinet SHSAU-NU

SHSAU-NU provides current and overload protection of main and auxiliary pumping unit drives, pump motor seizure protection, earth fault protection, supply network or load open-phase mode protection.

One of SHSAU-NU types is oil well pumping unit control. In this respect, SHSAU-NU operates with damper valve drive, pipeline water pressure sensors, well and tank tower water level sensors, other monitoring elements. In addition to oil well pumping unit control, SHSAU-NU are manufactured for drainage pumping units control, other liquids and gases transmission units.

In each case the unit is manufactured according to Customer’s specific requirements or its production requirements.

SHSAU-NU consists of the following functional systems:

• power circuit;
• indication, signaling and operating control system;
• microclimate monitoring and support system inside the cabinet.

Power part is made as separate units, installed on mounting panel, and cabinet rotating frame. It provides pump motor acceleration and stop with set rate and current limitation, as well as rotation speed changing, motor protection, auxiliary drives control.

Power circuit consists of the following devices:

• input unit;
• frequency converters;
• machine dU/dt filters;
• auxiliary drives automatic control means (damper valves, blowers, greasing systems etc.).

Input unit provides cabinet voltage supply, short circuit and overload protection of devices located before frequency converter. Damper valves drives and other auxiliary drives control circuit provides control, short-circuit and overload protection of these drives’ motors. Frequency converter is applied for pump motor power supply, providing motor startup and braking, motor current limitation.

Microprocessor control system of frequency converter provides:

• short circuit protection;
• earth fault protection;
• overload protection;
• overvoltage protection;
• protection against network voltage drop or phase loss;
• protection against motor shaft seizure;
• converter and motor overheating protection.

Operating control, indication and signaling system is provided for pump drive control and SHSAU-NU status signaling in all control modes.

Operating control system consists of visualization panel, programmable logic controller (PLC), input digital signals module, input analog signals module, output analog and digital signals module, controls, signal lamps.