PHASE LOSS, PHASE REVERSAL, PHASE UNBALANCE, UNDERVOLTAGE & OVERVOLTAGE PMD Series The PMD Series Three-Phase Monitor Relays continuously monitor all voltages to protect motors and equipment from expensive damage due to phase loss, phase reversal, phase unbalance, undervoltage and overvoltage. These products detect single phasing and unbalanced voltages regardless of any regenerative voltages. Utilizing an advanced microprocessor-based design allows true RMS voltage measurement with full wave monitoring. This provides a more accurate method to measure the voltages, regardless of load type or wave shape, and results in improved protection across more applications. Protects against phase loss, phase reversal, phase unbalance, undervoltage, overvoltage & rapid cycling Wide voltage ranges to cover more global applications True RMS voltage measurement ensures accurate sensing across more applications Retains fault indication and continues monitoring all voltages even with a lost phase Full fault indication on top of unit for easy troubleshooting Manual reset option works with external switch to reset the relay from outside the enclosure Compact 52.5mm wide enclosure for both DIN-rail or panel-mount 10A DPDT output contacts True RMS voltage measurement ensures accurate sensing in most generator and other applications with non-sinusoidal wave forms, eliminating nuisance tripping. Full wave monitoring provides a more accurate method to measure the voltages, regardless of load type or wave shape, resulting in improved protection across more applications. Unlike similar three-phase monitor relays, the PMD Series will continue to function even with a lost phase. They are the only line-powered units in their class to retain fault indication and continuous monitoring of all voltages during a phase loss, increasing the ease of troubleshooting and the level of protection. The PMD Series is a true universal product, with three units that work on a wide variety of adjustable line-line voltages to cover more global applications. Additional knobs allow adjustment of the undervoltage trip point, trip delay, restart delay and unbalance trip point. They utilize an enclosure for DIN-rail mounting that meets IEC Standards. Operation: When the proper three-phase line voltage is applied to the unit and the phase sequence (rotation) is correct, the relay is energized after the Restart Delay is completed. Any one of five fault conditions will de-energize the relay after a delay. As standard, re-energization is automatic upon correction of the fault condition. Manual reset is available if an external momentary N.C. switch is connected to terminals 4 & 5. A bi-color status LED indicates normal condition and also provides specific fault indication to simplify troubleshooting. NOMINAL PROTECTS AGAINST Phase Loss, Undervoltage & Overvoltage VOLTAGE CATALOG 50/60 Hz NUMBER 102-138V Phase Reversal, Phase Unbalance, 190-500V 460-600V PMD120 PMDU PMD575 WIRING DIAGRAM 800 Phase-to-Phase (Line-to-Line). Dual range unit auto-senses between the 190-250V AC and 350-500V AC ranges (see Application Data on next page). Better. By Design. 800.238.7474 www.macromatic.com [email protected] 20 Accessories available three-phase monitor relays | din-rail
