Information

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Voltage Monitoring (RPW/ERWM)
24
RPW-PTC - Temperature Variation
Monitoring via PTC Function
It is intended to monitor the temperature variation in motors or generators in
machines in general equipped with PTC temperature sensors. It has digital
electronics, which provides high accuracy and noise immunity.
Installation
It must be connected in series to PTC sensors (maximum 3). The RPW has a
test device for the PTC sensor. In case it is not connected or it is in a fault state,
the LED will indicate (LED will flash).
Selection
RPW - PTC - E05
Wiring Diagram
ON Normal operation
OFF Undervoltage, Overvoltage and Phase loss
ON
Supply voltage
OFF Without supply voltage
Flashing Fault in the PTC sensor
A1 - A2 Supply voltage
S1 - S2 PTC sensor input
15 - 16 - 18 Output
Specification
Power supply (L1-L2-L3) Reference
24-240 V ac 50/60 Hz or 24-240 V dc RPW-PTC-E05
A1 15
16 18 A3
RPW PTC
S1 S2
LED
ON
LED
OFF
LED
ON
LED
ON
LED
OFF
Threshold
temperature
Supply voltage
A1-A 2
Open sensor Short circuit in
the sensor
LED
flashing green
LED
flashing green
Terminals
Note: PTC sensor not included.
Power supply selection
E05 = 24-240 V ac / V dc
WEG Protective / Monitoring Relay PTC sensor function
Notes: It is recommended the use of three PTC sensors in series, according to IEC 60947-8.
The tripping temperature depends on the used PTC curve.
Operation
When it is energized, if the temperature is below the tripping value, the output relay will
switch (energize) without delay, switching ON the red LED. In case the temperature rises
above the limit, a sudden variation will occur in the PTC resistance, and the output relay
will de-energize (red LED switches OFF). The relay will be energized again as soon as the
temperature returns to the normal values.
A1 15
16 18
T
S1-S2
15-18
15-16
15 15 15 15 15
16 18 16 18 16 18 16 18 16 18
A2
S1
S2
Certifications