PMC-550D Low-Voltage Motor Protection Relay

PMC-550D Motor Protection Relay seamlessly integrates motor protection, control, temperature monitoring, and insulation monitoring with a modular design. Featuring extensive I/O options, including 10xDI, 5xDO, 2xRS-485 ports, 1x Analog Output, and 1x Residual Current Input, the relay offers flexibility and expandability, its modular design allows easy expansion, connecting a standalone HMI module for monitoring and control, a PMC-KT module for additional 6xNTC, 2xDI, and 1xDO for temperature monitoring and I/O control, and a PMC-KR module for ground fault insulation monitoring. The relay supports Modbus RTU/PROFIBUS, with PROFIBUS-DP available as an option. Equipped with a robust power supply, it ensures uninterrupted operation for 30 seconds during power interruptions. These versatile features make the relay suitable for diverse industrial needs.

Features:
Motor Start:
The PMC-5500D offers generic motor control functions like Direct-On-Line, Forward-Reverse and Two-Speed Start control. It also provides advanced motor starting schemes to reduce high starting and surge currents to prevent troublesome voltage dips on the main supply and transient torque effects in mechanical systems. Use the PMC-550D to facilitate the motor ON/OFF sequence control.

Applications:

• Direct-On-Line Start
• Forward-Reverse Start
• Two-Speed Start
• Reduce-Voltage Start (including Star-Delta Start, Auto-Transformer Start and Resistance Start)
  

Motor Protection:
Electric motors have distinct electrical and mechanical operation limits. Exceeding these limits may lead to issues such as mechanical vibration, stoppage, thermal damage, and ultimately, motor failure.
Protection Schemes:

• Electric Fault Protection: Short Circuit, Ground Fault, Residual Current, LOP, Negative Sequence, MTA Failure, Insulation Resistance, Thermal Resistance (PTC or NTC), Overvoltage, Undervoltage, Imbalance, Phase Reversal, etc.
• Mechanical Protection: Jam, Long Start, Thermal Overload, Overload, Under Power, Interlock, tE Time, CB Failure, Thermo., Block When Start