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  • Q1 Are there several types of encoder? Which are them?



    There are generally two types of encoder:

     

      a. Optical Encoder : absolute and incremental type 

      b. Magnetic Encoder: magnetic resistance and magnetic array type 

      Ex.1  Encoder is 5V Line Driver output: 

      Ex.2  Encoder is 12V Open collection output:

      Ex.3  Encoder is 12V PNP output: 


      Ex.4  Encoder is 12V Complementary (Push-Pull) output:

     

      Resource: Operation Manual, Rhymebus frequency inverter, Encoder Option Card

       

     

  • Q2 How to connect encoder and inverter?



    Please follow the instruction of operation manual of individual inverter, and make correspondent wiring between it’s terminal and encoder.

       

     

  • Q3 How to judge the directions (A) (B) (Z) of an encoder? What is the function of (Z)?



    The ideal phase difference of phases A and B is 90±0?. In fact, most factories use the 90±45?as indication specification. The input waveform is shown as the following diagram. An oscilloscope is usually used for measurement after connecting to the power.

    Z phase is always used for calculating the origin position.
       

     

  • Q4 If the encoder of motor has been fallen down or damaged, how would I test it by multimeter?



    After input correct current, turn slowly the Encoder, if the function of Encoder is good, output of each phase varies between zero and half of power voltage on the multimeter (except Z phase).
       

     

  • Q5 Why is the fault display OC appeared on the frequency inverter?



    This is the over-current protective function. When the load of motor increases instantly, motor is stuck, leakage of motor, or output of frequency inverter is short circuit, may lead to jump OC. Please turn off the power, remove the motor wire, measure the insulation impedance of motor, and check if the motor wire to linear impedance is balanced?

       

     

  • Q6 Why is the fault display OE appeared on the frequency inverter?



    This is over-voltage protective function. If the deceleration time set by frequency inverter is too short, the regenerate voltage produced by motor will be added to the DC BUS of frequency inverter, leading to jump OE resulted by too high DC voltage. Please extend the deceleration time of frequency inverter, or install an braking transistor or dynamic brake system and braking resistors for consuming the regenerate voltage, then the OE could be prevented.
       

     

  • Q7 Am I allowed using single-phase power supply for RM5E of 2HP?



    We suggest that, if using single-phase power supply for RM5E of 2HP, it’s better to integrate with 1HP motor. 2HP motor is recommended for a light load situation.

       

     

  • Q8 The label on the enclosure of RM5E frequency inverter indicates “temperature 40?”. Many clients worried temperature of their factory is about 45?. Could they use the inverter safely as usual?



    a.In the description of the operation manual, the inverter is safe to use insurrounding temperature of 50?. The label on the enclosure means that the user 

       should remove the label when the surrounding temperature exceeds 40? for facilitating the ventilation.


    b.The higher the surrounding temperature is, the shorter the lifespan of frequency inverter. In order to reduce the possibility of breakdown and extend the 

       lifespan of frequency inverter, one grade higher inverter is suggested.

       

     

  • Q9 In case of unexpected power failure (for 2 seconds), but frequency inverter is still unable to restart after the power is retrieved.



    The reason of frequency inverter fails to restart is due to the low voltage LE1 protective function. Please execute the following steps for resolving the problem:


    a.Please set F_060=7 (under voltage detection).


    b.Please set F_068= 200 to avoid error message OLO appeared.  



    c.Please set short circuit at COM & Tc1, X6 & Ta1, FWD&Tb1.

       

     

  • Q10 The frequency inverter suddenly stops operation and fault display GF is appeared. The wiring of motor seems OK after checking.



    a.Please check if the U,V,W three-phase line against to linear impedance is balanced?


    b.Please check if the insulation of motor is good? 500V, 100Mohm is the minimum standard.


    c.Please check if the wiring of U,V,W and X,Y,Z with motor are entirely covered?

       If the aforesaid are OK, the problem may result from the damaged sensor of electric current

       

     

 
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