Originally Posted by
Lesterz
I can get the VFD to start & run up to 24000 rpm without the spindle but when spindle is connected I get error OC-u, Acceleration over currency, cause "small acceleration time or component fail, diagnosis "increase acceleration time. I have the following parameters set.
Pn01 Display 24000
Pn02 Initial start 400
Pn03 Source of runtime frequency2 (from panel button)
Pn04 Source of runtime command 1 (from panel)
Pn05 clockwise or counter clock 1 (clockwise)
Pn06 Method to stop 1 stop by itself
Pn07 Start again by external signal 1 (disable)
Pn08 Acceleration time 100 (I started with 20 & went upwards but that did not help)
Pn09 Deceleration time 20
Pn10 Max run time freq 400
Pn11 Min run time freq 120
Pn12 Motor rating freq 400
Pn13 Torque compensation 0 (possible range 0-4)
Pn14 Torque compensation freq 400
Pn15 Startup DC braking voltage 30 (this was taken from default value in manual but range is 1 to 100)
Pn16 Startup DC braking time 0. Taken from default again but range is 0 - 650 seconds
Pn17 Stop Dc braking voltage 30. As for Pn16.
Pn18 Stop braking DC voltage 0. Taken from default. Range is 0-650.
Pn19 Source of multi segment speed 2 (panel button)
Pn20 Multi segment speed 1 frequency 10. taken from default.
Pn21 Multi segment speed 2 frequency 20. Taken from default
Pn22 Multi segment speed 3 frequency 30. Taken from default.
Pn23 Multi segment speed 4 frequency 40. Taken from default.
Pn24 Multi segment speed 5 frequency 50. Taken from default.
Pn25 Multi segment speed 6 frequency 60. Taken from default.
Pn26 Multi segment speed 7 frequency 70. Taken from default.
Pn27 Point move frequency 10. Taken from degault.
Pn28 Choice of relay output 3 taken from default. Options 1 = stop inverter, 2 = run inverter, 3 = inverter fault, 4 = freq increasing, 5 = freq decreasing, 6 = freq reached.
Pn29 2nd acceleration time 2. Taken from default.
Pn30 2nd deceleration time 2. Taken from default.
Pn31 2nd deceleration stop freq1. Taken from default. (""When runtime freq is larger than this value, acceleration/deceleration time is defined by Pn08,Pn09."")
Pn32 Parameter management 1. Taken from default. Options 1 = modification enable, 2 = modification disable, 3 = initialization for 400hz parameters, 4 = read OEM initialization parameter, 6 = initialization for 50hz parameters. NOTE password for the OEM parameter is 61633.
When I have tried to run the spindle it does move about 5 degrees. I have checked that the cable to the spindle is connected to correct pins & also correctly connected to VFD. I have earthed pin 4 on spindle to a screw under spindle cap.
I am stumped. Any checking of these parameters would be truly appreciated.