Search results for query: *

Gentlemen, Thanks for all the reponses, most interesting. I will discuss some of them with the company responsible for the total install. I'll try to reply to as many questions as possible. - Ambient: 43^C - VFD Carrier frequency: 5Kz (per cust @ factory default) - Motor nameplate FLA...

Application: Centrifugal Pump (Variable Torque) Motor: 200HP 1200RPM (FL RPM = 1185) 3/60/575V 447T TEFC Some history: Motor/Pump operated approx. 4 years without problems with Direct on Line starting and running at full load RPM. Routine motor maintenance and...

Utilizing Electronic Soft Starting and/or VFD will increase allowable number of stops/start. NEMA is best for small motors. Larger motors consult motor manufacturers. All subject to load WK^.

Above the fundemental frquency - 50Hz - the motor looses torque proportionally. ie 50/100 - 0.5 (There comes a point of saturation where the motor will just die and loose any abilty to function) If the pump is a Variable Torque pump the load increase HP(Cubed)and Torque(Squared). Take a...

Motor Thermal Curves (Thermal Damage or Capability Curve)when supplied from motor manufacturers, normally include: Thermal heating constant running: ie Time to reach thermal equalibrium. Thermal cooling constant stopped: ie Time to cool from hot condition. Consecutive start: ? Cold ...

Shortstub Thanks for the clarification. Out of interest....Does this value relate to Divisions or Zones ? EU (ATEX) or North American. I'm not clear on yr Space Heater comment. Our primary concern would be for surface temp and type of heater. I believe yr alert to be well received...

What type of load: Constant Torque or Variable Torque ? What is the operating speed range: ?Hz to ?hz Are you getting hi current at all speeds ? Is the VFD a regular V/Hz drive ? What is the carrier frequency ? What is the output voltage ?(use a true RMS meter) Is this a new application or...

Division 2 Class I: Where ignitable concentrations of flammable gases, vapours or liquids are not likely to exist under normal operating conditions. Note: Only hazardous under ABNORMAL conditions. --------------------------------------------------------- Occurance of all items taking place...