#1
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Hitachi SJ200 and ModBus Control Problems
As you may already know Tony and I are trying our hands with a Hitachi SJ200 VFD. We have the unit working with no problems with the keypad, start stop the spindle and any speed set with the pot.
Now if we connect it by ModBus with in Mach3 Config ModBus the <Test ModBus> I'm able to write and read both Coils and Holding Registers with no problems except when issue the coil 0001h Run command and the 0002h Direction Command the VFD goes into Alarm mode and needs to be reset to clear the Alarm code. The only Settings change are A001 and A002 to 03 so that it's now using ModBus and the 485 switch has been selected. SJ200 VFD Settings A001 = 03 Frequency Source Setting A002 = 03 Run Command Source Setting A003 = 400 Base Frequency Setting A004 = 400 Maximum Frequency Setting A044 = 00 V/f Characteristic curve Selection A082 = 220 AVR Voltage Select C071 = 06 Communication Speed Selection C072 = 1 Node Allocation C074 = 0 Communication Parity Selection C075 = 1 Communication Stop Bit Selection C076 = 02 Communication Error Selection C078 = 50 Communication Wait Time Any help would be much appreciated Regards Paul (Skippy) Forward Message |
#2
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Paul
One thing I have learned after much head scratching, Run is 0000h and direction is 0001h. 0002h is the register to send an alarm command. I know...I know......that is not how the Hitachi manual reads. As soon as I stopped sending a 1 to 0002h, the VFD stopped going into alarm condition. In fact the only coil register I send, is a 1 to 0000h. The default direction (CW) is all I need anyway. So no need to command that. (0001h) Greg |
#3
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Have you tried a 68 ohm resistor?
Sorry Skippy just could not help myself !! Ross |
#4
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Lol !! now now boys
Cheers Tony. |
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