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RPW-PTC
Monitoring Relay
RPW-PTC Monitoring Relay
The RPW-PTC relay - designed and manufactured by the world-class electric motor manufacturer
WEG (Brazil) - is an electronic device that provides monitoring of motors, generators and others,
whose stator windings and bearings are equipped with thermistor protection. The relay switches
off at the moment the temperature of the PTC sensor exceeds the maximum value specified by the
manufacturer. It avoids overheating of the equipment to be protected, as a result, it ensures safe
operation, extends lifetime and reduces maintenance costs on the machine.
Technology
The thermistor monitoring relay RPW-PTC was designed
according to international standards. Its housing is 22.5 mm
wide and can be inserted on DIN rail 35 mm, making the WEG
relay a compact and easy-to-assemble solution.
This product allows connection of several sensors in series (the
total resistance value of the PTCs cannot exceed 2.3 kΩ).
The relay can operate with a wide range of control voltage from
24 to 240 V, both AC (50 or 60 Hz) or DC.
Operation
The RPW-PTC relay has status
indication through the LEDs located on
the front of the product. The green LED
is ON when the relay is energized. If the
monitored temperature by the PTC is
below the defined value of 3.5 kΩ, the
red LED will be ON indicating normal
operation. Therefore, if the resistance
exceeds the limit of 3.5 kΩ, the relay
will instantaneously switch the output
contacts and the red LED will be OFF
indicating an over temperature
condition of the motor. The relay will
only switch on the 15 and 18
contacts again once the
temperature goes down to
normal values.
Additionally, the WEG PTC relay
provides sensor testing feature.
In case of failure of the PTC
sensors, the green LED will be
FLASHING. This feature
indicates that the PTC sensors
are either open or in shortcircuit (20Ω or less).
A1 15
RPW PTC
S1 S2
16 18 A2
Voltage Supply
24...240 VAC / VDC
On
Normal Operation
Off
Elevated Temperature
S1 - S2
PTC sensor input
On
Energized
15 - 16 - 18
Output
Off
Not energized
Operation diagram
Flashing PTC sensor failure
For further details, please, contact your sales support team or visit: www.weg.net
WEG Equipamentos Elétricos S.A.
International Division
Av. Prefeito Waldemar Grubba, 3000
89256-900 - Jaraguá do Sul - SC - Brazil
Phone:55 (47) 3276-4002
Fax: 55 (47) 3276-4060
www.weg.net
Cod: 50030383 | Rev: 00 | Date (m/y): 02/2011
The values shown are subject to change without prior notice.
A1 - A2