Title: Instructions manual - THGT fan.pdf
4.5 Most motors are supplied with permanently greased or sealed for life bearings and do not require re-lubrication. However, if motors with re-greasing facility are supplied, then follow the instructions in the specific motor Instruction manual and nameplate supplied. Warning: Do not mix different types of grease.4.6 Motors with speed control via Variable Speed Drive (VSD) Frequency Inverter, should not be run in excess of nameplate speed, orrun at less than 20% of nameplate speed without reference to manufacturer, since this may damage the motor.ATEX Ex e and Ex nA motors may not be run via VSD Frequency Inverter. ATEX Ex d and Ex t motors may be run via PWM type VSD Frequency Inverter, where motor has factory fitted PTC temperature sensors to control surface temperature. They may not be run at more than nameplate speed, or less than 40% of nameplate speed. VSD manufacturer may also limit minimum switching frequency. Refer IEC EN 60079-14.31