The PMPU-FA8X & PMPU-FA12X 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.
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, these products 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 PMPU-FA8X & PMPU-FA12X Series are true universal products that work on a wide
variety of adjustable line-line voltages to cover more global applications. All other settings for
undervoltage trip point, trip delay, restart delay and unbalance trip point are fixed for ease of
setup. Both these products offer more than the standard SPDT output contacts. An extra NC
contact can provide an isolated output for alarm circuits. The PMPU-FA8X uses a standard
8 pin octal socket even with the extra contact, and the PMPU-FA12X uses a 12 pin square
socket
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. Re-energization of the relay is automatic upon
correction of the fault condition. A bi-color status LED indicates normal condition and also
provides specific fault indication to simplify troubleshooting.
Features
- Protects against phase loss, phase reversal, phase unbalance, undervoltage, overvoltage & rapid cycling
- Universal voltage range of 190-500V—greater range that covers 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
- 5A SPDT/SPNO (PMPU-FA8X) or 5A DPDT (PMPU-FA12X) output provides isolated contact for alarm circuits
