Macromatic Industrial Control & Monitoring Products

PMD Series

  • Universal voltage range of 208-480V on PMDU provides the flexibility to cover a variety of applications with one unit (separate 575V-only version available)
  • Protects against phase loss, phase reversal, phase unbalance, undervoltage and overvoltage
  • Variety of user-selectable & adjustable settings for the ultimate in three-phase protection
  • Automatic & manual reset in same unit
  • Multi-color LED indicates normal condition and defines fault to simplify troubleshooting
Enclosure Style 45mm IEC style that can be either mounted on 35mm DIN track or panel mounted w/ two screws
Contact Rating
  • 10A @ 240V AC/30V DC; 1/2HP @ 120/240V AC (N.O.),1/3HP @ 120/240V AC (N.C.)
Approvals       c-ul-us.jpg  CE_Logo.gif      UL File #E109466
Technical Documentation

The PMD Series Phase Monitor Relays utilize a microprocessor-based design to provide protection against phase loss, phase reversal, phase unbalance, undervoltage and overvoltage. The PMDU is a universal voltage product that works on any three-phase system voltage from 208-480V (separate 120V & 575V versions are available). These devices are designed to be compatible with most Wye or Delta systems. PMP Series products protect against unbalanced voltages or single phasing regardless of any regenerative voltages.

The relay is energized when the phase sequence and all voltages are correct. Any one of five fault conditions will de-energize the relay. As standard, re-energization is automatic upon correction of the fault condition. Manual reset is available if a momentary N.C. switch is wired to the appropriate terminals. A multi-color LED indicates normal condition and also provides specific fault indication to simplify troubleshooting.

The PMP Series offers a variety of user-adjustable settings. The percent phase unbalance is adjustable from 2-10%, and also has a "Disable" setting for those applications where poor voltage conditions could cause nuisance tripping. The undervoltage drop-out can be set at 80-95% of operating voltage (overvoltage setting is fixed at 110% of nominal). The adjustable time delay drop-out on undervoltage (0.1-20 seconds) eliminates nuisance tripping caused by momentary voltage fluctuations. There is also an adjustable time delay (1-300 seconds) on both power up and restart after a fault has been cleared.



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