The PMPU-FA8 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, the PMPU-FA8 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 PMPU-FA8 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. All
other settings for undervoltage trip point, trip delay, restart delay and unbalance
trip point are fixed for ease of setup. They utilize an industry-standard 8 pin octal
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 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 pins 6 and 7. 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
- Manual reset option works with external switch to reset the relay from outside the enclosure
- 10A SPDT output contacts
