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Voltage Monitoring (RPW/ERWM)
22
RPW-FSF - Phase Loss and Phase Sequence Function
It is intended to protect three-phase systems against phase loss and phase inversion.
For applications with neutral, a bridge must be provided between terminals A and B.
The RPW-FSF will monitor against phase loss and also the voltage on the neutral, which
must be connected.
Selection
Specification
RPW - FSF - D70
Supply voltage (L1-L2-L3) 50/60 Hz Reference
220-240 V ac RPW-FSF-D66
380-415 V ac RPW-FSF-D70
440-480 V ac RPW-FSF-D74
Installation
It is directly connected to the three phases (terminals L1, L2 and L3)
of the power grid to be monitored (connect the neutral if applicable).
Wiring Diagram
Energized output
Energized relay
The RPW protective relay
has LEDs for state indication,
as shown on the right:
L1 15 L2
16 18 L3
RPW FSF
A B N
L1 L2 L3
A B N
Neutral
selection
16 18
15
n
f
f
L1-L3-L2
t
Power supply selection
D66 = 220-240 V ac 50/60 Hz
D70 = 380-415 V ac 50/60 Hz
D74 = 440-480 V ac 50/60 Hz
WEG Protective / Monitoring Phase loss and phase
Note: for application in generator sets, frequency inverters with 12-pulse or regenerative rectifiers, electronic power controllers (dimmers or the like) or where a high
level of harmonic currents may be present (above the recommendation of IEEE519), we recommend the ERWM relay.
Operation
Energize the relay and observe if the green LED (power supply) and
the red LED (relay) turn on. If they do not switch on, check for voltage
between phases L1, L2 and L3 (including in relation to the neutral if
applicable), and if they are in the correct sequence.
LED
ON
LED
ON
LED
OFF
LED
OFF
16 18
15-16
15-18
16 18
16 18
16 18
15
15
15
15
L1-L2-L3 L1-L2-L3 L1-L3-L2L1-L2
Phase or
neutral loss
Phase
inversion
V
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