Information

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Voltage Monitoring (RPW/ERWM)
21
RPW-SF - Phase Sequence Function
It is intended to protect three-phase systems against the
inversion of the phase sequence (L1-L2-L3).
Installation
It is directly connected to the three phases (terminals L1, L2 and
L3) of the power grid to be monitored.
Selection
Specification
RPW - SF - D70
Wiring Diagram
The RPW protective relay
has LEDs for state indication,
as shown on the right:
Energized output
Energized relay
L1 15 L2
16 18 L3
RPW SF
L1 L2 L3
t
Supply voltage (L1-L2-L3) 50/60 Hz Reference
220-240 V ac RPW-SF-D66
380-415 V ac RPW-SF-D70
440-480 V ac RPW-SF-D74
16 18
15
Certifications
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 sequence function
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
If the phase sequence is correct, the output relay switches the
contacts to the operation position (closing terminals 15-18), and
the red LED (relay) and green LED (power supply) will switch on.
16 18
16 18
15
15
LED
ON
LED
OFF
L1-L2-L3
L1-L2-L3
Inversion
t
T
V
15-18
15-16