AC 3PHASE INVERTER,S WIRING NOTES

          WIRING NOTES

1 . when dismounting the'motor please cut off the power supply
     first.
2 . the switch over of motor or mains supply can be done only
     when inverter's output stops .
3 . when the inverter is installed with exterior devices  (barking
     unit' reactor'filter) please test the devices'resistance to the
     ground by 1000v level megameter and make sure the
     resistance is not less then 4m.
4   input command single cable and frequency meter cable need
     to be shielded'and it also should be wired separatedly.it is
     better to kept away from the main circuit connection.
5   to avoid from the wrong action caused by interference'the
     control circuiting cable shield be twisted pair cable'and the
     wiring distance shall be less the 50m.
6   please do not make shielding cable connect to the single
     cable or machine's housing.the naked wire shall be wraped by
     isolation tape.
7   all the lead wires  voltage with stand level shall be same as the inverter's voltage level.
8   to avoid of accident'control grounding terminal g must be well connected to the ground.the grounding wire      cann't be the other equipment's grounding wire.the grounding wire specification shall be bigger then half of
     the above-said wire specification.when the wiring is completed'please check whether there is cable'screw
     or connector lug left in the equipment or not'whether the screw is loose 'whether the naked wire of the
     terminal is short-circuited to the other terminal.  




     

AC 3PHASE INVERTER,S CONTROL CIRCUIT TERMINAL WIRING DESCRIPTION

CONTROL CIRCUIT TERMINAL WIRING DESCRIPTION.

to reduce the control signal's interference and attenuation' the control signal's wiring length shell be limited within 50 cm and the distance to the power cord shell be longer than 30 cm. when connecting the along input and output signal' please use twisted pair cable and connect one end of the shielding sleeve to the ground.

CONTROL CIRCUIT CONNECTION NOTES.

to layout separatedly the control circuit cable'main circuit cable and other power supply cable. to avoid from
the wrong operation cased by interference' control circuit cable needs to be twisted pair cable. the connection distance shall be less than 50 m. the distance to power cable needs to be more than 30 cm. please use twisted pair cable for the command from terminal. please see below when the output contact of multifunction  optical coupler connects to relay' coil's two ends needs to connect to bypass diode in parallel.
please do not make shielding cable connect to the single cable or machine's housing. the naked wire shall be
wraped by isolation tape.
contact output terminal 9'10'18'19'20' must be connected to terminal 1~8'11~17'21~23'25~27'33 independently.  



    

AC 3PHASE INVERTER,S CONDUCTION INTERFERENCE PREVENTION METHOD.

CONDUCTION INTERFERENCE PREVENTION METHOD.

to suppress the conduction interference from the output side' it is applicable to let all the input cables go through a grounded metal tube.







THE WIRING DISTANCE BETWEEN INVERTER AND MOTOR.

the longer the wiring distance between the inverterand motor is' the higher there carrier frequency is and the  gigger the upper harmonics current in the cable is . the current leakage will implement bad effect on the embient equipment . in this case it is necessary to minimize the current leakage. please find below table for the relation between the wiring distance (between the inverter and motor ) and carrier frequency .

AC 3PHASE INVERTER,S PHASE-SHIFT CAPACITOR IS NOT ALLOWED TO USE.OF INVERTER.

please do not connect phase-shift capacitor or lc/rc filter to the output circuit. otherwise'the inverter will
be burned.






ELECTROMAGNETIC SWITCH BETWEEN INVERTER AND MOTOR IS ALLOWED TO USE.
please do not connect electromagnetic switch'electromagnetic contactor to the output circuit.otherwise'
the inverter's surging current will lead to the action of over current protection. in serious case'the inverter's
internal parts could be damaged.

please install a mccb which is compatible to the inverter' capacity .

1  . the capacity of mccb should be 1.5-2 multiples of the inverter's rated current . mccb's time characterics
shall satisfy the inverter's overload protection characteristics (150% of the rated current /minute' 180% of the rated current/2 second )

2  . when mccb is shared by two or above motors or other equipment ' please connect according to the below fig . connect the fault output relay contact of the inverter to the power supply contactor and cut off the
input power supply .

THE INSTALLATION AND SELECTION OF ELECTROMAGNETIC CONTACTOR.
to cut the main circuit power supply at the fault of inveryer and prevent the inverter from restarting at fault' please install electromagnetic contactor on the power supply side of the inverter.

RFI PREVETION  SOLUTION.
input cable'output cable and the inverter itself all can create fri. dedicated filter needs to be used at both input
side and output side of the inverter. the normal filter cann't achieve the expected effected. and the input and output terminal shell be custom-made. the rfi can be reduced to use iron device for shielding the connecting
cable between inverter and motor shall be as short as possible. please find below for the rfi prevention.

AC 3PHASE INVERTER,S MAIN CIRCUIT CONNECTING METHOD .

INVERTER (main circuit connecting method )


at run time' please check whether the motor is in forward operation
at the command of forward operation . if it is in reverse operation'
please stop the system' cut the power supply and exchange any two
terminals among  u'v'w  then the motor will run forward .
do not disconnect the power supply to the inverter's output terminal '
otherwise' the inverter's interior will be damage. the grounding of
output terminal is not permitted. please do not left the output cable
to touch or connect the machine housing'otherwise'the inverter's
interior could be damage.

please do make sure the grounding wire connects to the ground. the grounding resistor resistance should be
less than 10w for inverter of 380 v  level .
welding machine or other power equipment . the wire diameter shall conform with the stipulation of electric
equipment technical standard' and the wire should be as short as possible . in the occasion where two inverters are used at the same time' please do not make the grounding wire establish a loop. please find below for the correct grounding method and the wrong grounding method.
note; do not grounding the neutral point of the motor with y  connection.

ELECTRIC INVERTER,S {to select ac reactor }

                     INVERTER {to select ac reactor }


when the inverter works in the big power circuit'since the power supply's
impedance is small' the input rectifier will create big peak current.
this phenomenon is becoming more serious when there is capacitor over
compensation in power supply' or the circuit is connected to big power
rectifier or when static condenser is switching.to improve the above situation'
please select an ac reactor according to the range shown in below fib






   power capacity(kva)
                                    --- - - - -----------------------------
      400                        - ac.choke coil or                --                            
                                   -  dc.reactor is.                 -                      
                                   -  necessary                  -                
     600                              -                         -      
                                    ---------------------                          
                                     -------------------------------------
             0                                            60                   400

                                            inverter power (kva)

INVERTER (the selection of radio noise filter )



when the radio interference is serious to the exterior or the
exterior radio interference is serious to the inverter please
use radio noise filter to reduce the two way interference
caused by radiation or conduction.











 

AC 3PHASE INVERTER,S {TERMINAL FUNCTION OF MAIN CIRCUIT }

      INVERTER{terminal function of main circuit}

input power supply: r  s  t
grounding cable: g
DC bus:   -    +
motor wiring: u  v  w
braking resistor: pb

the main circuit terminal function is shown as below table.conduct correct wiring
according to the corresponding functions.


TERMINAL CODE                                FUNCTION DESCRIPTION

r s t                                         power supply input terminal ' it connects to 3- phase ac power supply or                                                single phase ac power supply.


u v w                                     are inverter's output terminal.it connects to 3 phase ac motor


-  +                                        connects to the connecting terminal of braking unit. - + they are
                                             respectively the dc bus's anode and cathode.


+, pb                                     braking  resistor connecting terminal.one end of the resistor connects to
                                             +; the other end connects to pb



G                                        g grounding terminal;connecting to the grounding.



exterior devices and optional parts

description of mccb

used to rapidly cut off the inverter's power supply and prevent the inverter and its circuit's
a fault from causing power supply fault.

description of  mc

at the fault of inverte's it is used to cur off the main power supply and avoid of restarting
following power failure or inverter  fault.

description of acl

it is used to improve the input power factory and reduce upper harmonics and restrict the
power supply's surging.

description of nf

it is used to reduce the radio interference caused by inerter. when the wiring distance
between motor and inverter is below  20 meters' it is recommended to connect to the
power supply side.when the wiring distance between motor and inverter is above 20
meters' it is recommended to connect to the output side.

description of  r* ub*

it is used when the braking torque cannot meet the requirement. it is suitable for the
occasion with large initial load and frequent braking fast stop.