Fanuc DC servo + 7i77

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04 Aug 2017 17:53 #97010 by smalla
Replied by smalla on topic Fanuc DC servo + 7i77
the drives are receiving a feedback signal based on encoder, these are the relevant settings:
OUTPUT_SCALE = 2857.0
OUTPUT_MIN_LIMIT = -2857.0
OUTPUT_MAX_LIMIT = 2857.0
FEEDBACK_SCALE = 3333.0
FEEDBACK_MIN_LIMIT = -3333.0
FEEDBACK_MAX_LIMIT = 3333.0
net x-output => hm2_5i25.0.7i77.0.1.analogout0
net x-vel-fb <= hm2_5i25.0.encoder.00.velocity => hm2_5i25.0.7i77.0.1.analogout1
velocity control is 6v/1000rpm the feedback should be 7v/1000rpm according to docs.

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25 Nov 2017 14:06 #102334 by ditechcnc
Replied by ditechcnc on topic Fanuc DC servo + 7i77
simple way to generate techo signal
mesa 5i20 + 7i33
setp hm2_5i20.0.pwmgen.04.output-type 1
setp hm2_5i20.0.pwmgen.04.scale 25
setp hm2_5i20.pwmgen.04.enable true
net x-vel-fb => hm2_5i20.0.pwmgen.04.value

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25 Nov 2017 14:10 #102335 by ditechcnc
Replied by ditechcnc on topic Fanuc DC servo + 7i77
Attachments:
The following user(s) said Thank You: johnmc1

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25 Nov 2017 23:08 #102342 by johnmc1
Replied by johnmc1 on topic Fanuc DC servo + 7i77
Good Day,
Thanks for your reply.
The line ,
setp hm2_5i20.0.pwmgen.04.scale 25.
What reference did you use to arrive at the scale number 25?
Also did you increase the servo update rate?
john

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30 Nov 2017 12:57 #102527 by ditechcnc
Replied by ditechcnc on topic Fanuc DC servo + 7i77
i am using 24vdc small motor mount 100ppr encoder
with amc 12a8 servo amp.
working perfect with scale 25

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05 Dec 2017 03:03 #102688 by johnmc1
Replied by johnmc1 on topic Fanuc DC servo + 7i77
Good day ,
Thanks for your reply,
I intend to use the pulse coder of the fanuc dc servo drives for tacho reference .
As I have only just started the refit on the Matsuura mill it will be some time before
the axis will be activated .
Regards john

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