The PJPU-FA8X Series Three-Phase Monitor Relays continuously monitor all
voltages to protect motors and equipment from expensive damage due to phase
loss, phase reversal & undervoltage. They also provide an indication of a phase
unbalance condition, but the relay does not trip.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 PJPU-FA8X 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 PJPU-FA8X Series is a true universal product that works 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. In addition to the standard SPDT output contacts, these
products include an extra SPNO contact that provides an isolated output for
alarm circuits. They utilize an industry-standard 8 pin octal socket, even with the
extra SPNO output
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. A fault condition of phase loss, phase reversal or undervoltage will
de-energize the relay after a delay. Re-energization of the relay is automatic
upon correction of the fault condition. NOTE: the relay will not trip (de-energize)
on an unbalance condition, but the LED will provide a visual indication at
6% unbalance until 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, undervoltage & rapid cycling
- Indication of Phase Unbalance (Relay Does Not Trip)
- 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 output provides isolated contact for alarm circuits
