JB/T 12303-2015Specification of YA2 series increased safety high-voltage three-phase asynchronous motors (frame size 355 to 560) (English PDF)

National Standard of the People's Republic of China

Issued by: Ministry of Industry and Information Technology of the People's Republic of China

Contents

• 1 Scope
• 2 Normative references
• 3 Type, basic parameters and dimensions
• 4 Technical requirements
• 5 Test methods
• 6 Inspection rules
• 7 Marking, packaging and warranty period
• Figure 1 Outline and mounting drawing and dimensions
• Figure 2 Relationship between the minimum value of the time tE of the motor and the starting current ratio
• Table 1 Correspondence between the frame number and the speed and power
• Table 2 Mounting dimensions and tolerances
• Table 3 Dimensions and tolerances of the shaft extension key
• Table 4 Radial run-out tolerances
• Table 5 Parallelism tolerances
• Table 6 Flatness tolerances
• Table 7 Symmetry tolerances of the keyway
• Table 8 Guaranteed values of efficiency and power factor
• Table 9 Guaranteed values of the ratio of locked rotor torque to rated torque
• Table 10 Guaranteed values of the ratio of locked rotor current to rated current
• Table 11 Tolerances on the guaranteed values of the electrical performance
• Table 12 Time interval after switching off in the temperature rise test
• Table 13 Maximum surface temperature
• Table 14 Temperature rise limits of the parts of the motor
• Table 15 Limits of vibration severity expressed as displacement, velocity and acceleration for the different shaft heights H in millimetres (root mean square values)
• Table 16 Clearance and creepage distance
• Table 17 Test items
• Table 18 Marking of the terminals