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Nameplate
Nameplate data is the critical first step in determining motor replacement. Much of the information
needed can generally be obtained from the nameplate. Record all nameplate information; it can save
time and confusion.
Important Nameplate Data
• Catalog number
• Motor model number
• Frame. Designates NEMA frame size dimensions
• Type (classification varies from manufacturer to manufacturer)
• Phase - single, three or direct current
• HP - horsepower at rated full load speed
• HZ - frequency in cycles per second, usually 60 HZ in United States, 50 HZ overseas
• RPM - revolutions per minute
• Voltage
• Amperage (F.L.A.) - full load motor current
• Maximum ambient temperature in centigrade - usually +40°C (104°F)
• Duty - most motors are rated continuous. Some applications, however, may use motors designed
for intermittent, special, 15, 30 or 60 minute duty
• NEMA electrical design - B, C and D are most common. Design letter represents the torque
characteristics of the motor.
• Insulation class - standard insulation classes are B, F, and H. NEMA has established safe maximum
operating temperatures for motors. This maximum temperature is the sum of the maximum
ambient and maximum rise at maximum ambient.
• Code - indicates locked rotor kVA per horsepower
• Service factor - a measure of continuous overload capacity
• Inverter Speed range information - 3-Phase motors
• Manufacturer Agency Approval information - UL, CSA, CE, etc.