WEG DWE-4 Electronic Motor Protection Relay with Ground Fault and PROFIBUS

The WEG DWE-4-S4-NT-GF combines the full advanced protection feature set of the DWE-4 platform with integrated sensitive ground fault detection and PROFIBUS DP fieldbus communication, creating the most comprehensive motor protection relay in the WEG MPW/DWE product range. This relay is specified for the largest and most critical motors in Saudi industrial facilities — main gas compressor motors, sea water reverse osmosis high-pressure pump drives, large agitator drives in petrochemical reactors, and turbine auxiliary motor starters — where any unplanned outage has significant production and safety consequences.

Comprehensive Protection Suite

The DWE-4-S4-NT-GF delivers: Class 5/10/20/30 thermal model overload with ambient temperature compensation, phase unbalance (2–30% threshold), phase loss, thermistor (PTC/NTC for stator and bearing temperature), sensitive earth fault (0.1–5.0 A), over/under voltage protection, under-power/no-load (dry run) detection, locked rotor and excessive starting time, restart inhibit (thermal memory), and event log with timestamps — providing a single relay solution for all motor protection requirements specified in Saudi Aramco SAES-P-100 sections on critical motor protection.

PROFIBUS DP Communication for Saudi DCS Integration

PROFIBUS DP at up to 12 Mbps enables seamless integration with Siemens SIMATIC PCS 7, ABB 800xA, and Honeywell Experion DCS platforms used extensively in Saudi Aramco's downstream refinery and gas processing facilities. The GSD file for PROFIBUS configuration is provided with the relay. All protection set points, measured values, fault status, and motor health indicators (thermal state, time to trip, time to reset) are accessible via PROFIBUS cyclic data exchange, enabling real-time motor health displays in Saudi Aramco control rooms.

Saudi Aramco Critical Motor Application

For Saudi Aramco motors rated above 200 kW on critical services (SAES-P-100 Category 1), electronic motor protection relays with all the functions of the DWE-4-S4-NT-GF are mandatory. Razz Middle East supports Saudi Aramco EPC contractors and vendor packages by providing relay setting calculations, DCS integration support, and site commissioning services including secondary current injection testing and functional trip testing witnessed by SAI inspectors. Our team has experience supporting large Aramco, SABIC, and SWCC projects throughout Saudi Arabia.