Rockwell Automation Allen-Bradley PowerFlex 7000, Руководство пользователя

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416 Rockwell Automation Publication 7000L-UM301F-EN-P - March 2020
Appendix A Catalog Number Explanation
When is an Encoder
Required? An encoder is required under the following conditions:
1. When speed regulation accuracy must be between 0.01 – 0.02% of
nominal speed.
2. When the zero speed breakaway torque needed is greater than 90% of
continuous running torque.
3. When continuous running speed is greater than or equal to 0.1 Hz, but less
than 6 Hz.
4. For minimizing restart times using the flying start capability in forward or
reverse direction.
5. At any time when high performance torque or speed control mode
(HPTC) is enabled.
Table 30 - Power Flex Speed Regulation
Notes:
• Speed Regulation is based on% of motor synchronous speed.
• Tachometer to be mounted on the AC machine.
• Operational 15 V DC Power Supply mounted in drive to power the
encoder as a standard option with the encoder feed back card.
• Customer is responsible for providing and mounting of encoder.
• Sleeve bearing motors require the encoder to have an axial movement
tolerance.
• Recommended encoders are shaft mounting type.
• Magneto resistive models are more adaptable to harsh environments.
• When installing, the encoder body and electronics must be isolated from
ground (options available from the encoder manufacturer to accomplish
this).
• There are usually limits on encoder cable lengths. Ensure the maximum
length is suitable for the application.
Encoder Frequency Output
<6 Hz 6...15 Hz >15 Hz
Without Encoder Not applicable 0.1% 0.1%
With Encoder 0.02% 0.01% 0.01%
With Encoder and HPTC
mode enabled 0.01% 0.01% 0.01%