Mitsubishi VFD Modbus cant get it work
- hitchhiker
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16 Jan 2022 00:56 #231979
by hitchhiker
Replied by hitchhiker on topic Mitsubishi VFD Modbus cant get it work
the scale is only ×.... with a second math function like ÷.. its more usefull.
linuxcnc is great... mach3 needs hardware like ess smoothstepper.. with linux you can use a old pc... its great
linuxcnc is great... mach3 needs hardware like ess smoothstepper.. with linux you can use a old pc... its great
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- cmorley
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16 Jan 2022 01:02 #231980
by cmorley
Replied by cmorley on topic Mitsubishi VFD Modbus cant get it work
I don't use divide because of divide by zero problem - you can multiple by reciprocal
ie. divide by 10 = multiply by 0.1
ie. divide by 10 = multiply by 0.1
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16 Jan 2022 09:03 #231992
by hitchhiker
Replied by hitchhiker on topic Mitsubishi VFD Modbus cant get it work
ie. on mach3 the spindle rpm wish is for my setup:
A/0.28
A is the value for the rpm
if A 2800 it sends 100.. 100 Hertz.
max rpm motor 2850 at 100 Hertz.
A/0.28
A is the value for the rpm
if A 2800 it sends 100.. 100 Hertz.
max rpm motor 2850 at 100 Hertz.
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16 Jan 2022 09:40 #231993
by cmorley
Replied by cmorley on topic Mitsubishi VFD Modbus cant get it work
Math seems wrong:
2800 / 0.28 = 10 000 not 100
maybe a typo?
2800 / 28 = 100
or
2800 x (1/28) = 100
2800 x 0.03571 = aprox 100
So you can get the same output using a multiplied scale.
It avoids a program crash for divide-by-zero, without having to have code to specifically check for it.
Chris
2800 / 0.28 = 10 000 not 100
maybe a typo?
2800 / 28 = 100
or
2800 x (1/28) = 100
2800 x 0.03571 = aprox 100
So you can get the same output using a multiplied scale.
It avoids a program crash for divide-by-zero, without having to have code to specifically check for it.
Chris
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16 Jan 2022 10:11 #231997
by hitchhiker
Replied by hitchhiker on topic Mitsubishi VFD Modbus cant get it work
this is from the mach3 Board
www.machsupport.com/forum/index.php?topic=27490.0
i use 0.28 to match the correct value for wish = is rpm.
because i have a transmission of input from the motor and output on the spindle its not 1 to 1... i measure the spindle revs. with a encoder.. on the complete bandwith i have a error of 10rpm.
www.machsupport.com/forum/index.php?topic=27490.0
i use 0.28 to match the correct value for wish = is rpm.
because i have a transmission of input from the motor and output on the spindle its not 1 to 1... i measure the spindle revs. with a encoder.. on the complete bandwith i have a error of 10rpm.
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16 Jan 2022 10:28 #231999
by cmorley
Replied by cmorley on topic Mitsubishi VFD Modbus cant get it work
ahh yes modbus doesn't officially handle floats.
if you want 65.55 hertz you multiply it by 100 to get 6555.
then 100 hertz would be 10000.
if you want 65.55 hertz you multiply it by 100 to get 6555.
then 100 hertz would be 10000.
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16 Jan 2022 10:36 #232000
by hitchhiker
Replied by hitchhiker on topic Mitsubishi VFD Modbus cant get it work
yes... know the price question... what value is need to multiplie..
how difficult is it to bring the dividing option for scale into the code?..
how difficult is it to bring the dividing option for scale into the code?..
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26 Jan 2022 12:34 #233166
by jpg
Replied by jpg on topic Mitsubishi VFD Modbus cant get it work
Hello, is your configuration working now ?
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26 Jan 2022 13:13 #233168
by hitchhiker
Replied by hitchhiker on topic Mitsubishi VFD Modbus cant get it work
yes but its npt modbus rtu.
the comp. is for the mitsuboshi com. protocol.
npw i must use a second rs485 dongle for my other modbus parts
the comp. is for the mitsuboshi com. protocol.
npw i must use a second rs485 dongle for my other modbus parts
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26 Jan 2022 15:56 #233185
by jpg
Replied by jpg on topic Mitsubishi VFD Modbus cant get it work
do you have a configuration? (hal ,ini custom panel..) so I can try it, thanks
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