Motors used in conjunction with high pressure pumps for humidity control systems can easily be incorporated into the pump design to meet project requirements specifying “Motors with Thermal Protection”.
According to section 7.2 of the WEG “Specifications of Electric Motors” referenced from www.weg.net:
Motors used for continuous duty must be protected against overloads by a device integrated to the motor, or an independent device, usually fitted with a thermal relay having rated or setting current equal to or below the value obtained by multiplying the rated motor power supply current ( In ) by the Service Factor ( SF ), as shown in table below:
WEG: Thermal Protection Chart for Electric Motors
The thermal protection is provided by means of thermoresistances ( calibrated resistances ), thermistors, thermostats or thermal protectors. The temperature detectors to be used are defined in accordance with the temperature class of the insulation materials used for each type of machine as well as based on customer requirements.
