⚠️ Editor's Note: This product has been discontinued. This page is for reference only.

DMPU Series Motor Protection System is a modular electronic motor protection relay to control, monitor, and protect the performance of 3-phase constant- or dual-speed AC induction motors. The DMPU device measures electrical motor variables (voltage, current, harmonic distortion, power, energy, and earth leakage current), monitors overloads through the thermal model, controls them, and measures other variables, such as motor and bearing temperature. Finally, it includes a data logger function for storing trends of the electrical variables, alarms, and fast data logging for storing start-up profiles.

Through the communication features, it is possible to transmit all monitored variables to a supervision control system for data collection and process control. Profibus and Modbus TCP/IP protocols are available to easily insert the DMPU Series into a majority of applications. The HMI operator interface is freely programmable and can show instantaneous values and alarm messages. Windows-based DMPU-PS configuration and monitoring software simplifies plant design through graphic block configuration and connection, where the blocks are all the variables that can be used as inputs, outputs, ANSI functions, electrical and temperature variables, logical functions, timers, and counters.

The DMPU Series allows protection of the motor against damage due to thermal effects taking place during overload conditions. The protection trips when motor temperature exceeds the calculated TCU parameter, as well as optional temperature measurements and electrical variables. The DMPU implements several ANSI functions to protect the motor from operation that may damage it. For example, ANSI 46 (motor inverse current), ANSI 51 LR, ANSI 48 (locked or stalled rotor), and ANSI 46 (earth leakage) are among the few that are supported. All control functions such as start, stop, reverse, star-delta control, and alarm indication are possible with push buttons, touch screen HMIs, or communications.

Modular concept with these modules available:

• DMPUT-MBT: Modbus TCP/IP communication
• DMPU-PRB: Profibus communication
• DMPU-05: Current and voltage measurements
• DMPU-R2: 2 temperature or digital inputs & 2 outputs
• DMPU-EL: Earth leakage module
• DMPU-HMI: Simple two-line HMI operator panel
• BTM-T4/T7: 4.3” and 7” touch screen interfaces
• Integral heat sink with robust metal DIN rail adapters
• Direct voltage measurement up to 690V AC
• Direct current measurements up to 5A, higher with CTs
• Up to 23 temperature or digital inputs
• Up to 22 relay outputs