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Voltage Monitoring (RPW/ERWM)
23
RPW-SS - Undervoltage and Overvoltage Function
With this function, the RPW monitors the minimum and maximum voltage variations
within which a three-phase power supply can operate. Whenever an under or
overvoltage condition is present, the relay will switch its output in order to interrupt
the operation of the monitored motor or process.
Note: the RPW SS is suitable for line frequencies of 50/60 Hz.
Installation
It is directly connected to the three phases (terminals L1, L2 and L3) of the power
grid to be monitored.
Selection
RPW - SS M - D23
Wiring Diagram
L1 15 L2
16 18 L3
RPW SS
L1 L2 L3
16 18
15
Upper limit
Lower limit
15-18
16 18
16 18
15 15
15-16
L1 L2 L3 L1 L2 L3
L1 L2 L3
LED
ON
LED
OFF
Above 20% between phases
ON Normal operation
OFF Undervoltage, Overvoltage and Phase loss
ON Supply voltage
OFF Without supply voltage
Specification
Supply voltage (L1-L2-L3) 50/60 Hz Reference
208 V ac RPW-SS-D77
220 V ac RPW-SS-D23
230 V ac RPW-SS-D24
240 V ac RPW-SS-D25
380 V ac RPW-SS-D33
Power supply selection
D77 = 208 V ac 50/60 Hz D34 = 400 V ac 50/60 Hz
D23 = 220 V ac 50/60 Hz D35 = 415 V ac 50/60 Hz
D24 = 230 V ac 50/60 Hz D36 = 440 V ac 50/60 Hz
D25 = 240 V ac 50/60 Hz D38 = 460 V ac 50/60 Hz
D33 = 380 V ac 50/60 Hz D39 = 480 V ac 50/60 Hz
WEG Protective / Monitorin
Relay undervoltage and overvoltage function
Supply voltage: (blank) - Three-phase / M - Single-phase
1)
Undervoltage Overvoltage
Notes: 1) Available only for voltage D23 (220 V ac - 50/60 Hz). Pending certifications.
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 voltage on terminals A1 and A2 is correct, the output relay is energized
(contacts 15-18 close). If the monitored voltage (supply voltage) is below or above
the adjusted limits for undervoltage and overvoltage, respectively, the output relay is
de-energized (contacts 15-18 open). The output relay is energized again when the
voltage returns to an acceptable value.
Supply voltage (L1-L2-L3) 50/60 Hz Reference
400 V ac RPW-SS-D34
415 V ac RPW-SS-D35
440 V ac RPW-SS-D36
460 V ac RPW-SS-D38
480 V ac RPW-SS-D39
220 V ac (single-phase) RPW-SSM-D23
V
Certifications