THCAD via 7i96-7i94D mode 2 mpg encoder input
- microsprintbuilder
- Offline
- Elite Member
Less
More
- Posts: 165
- Thank you received: 4
27 May 2020 01:24 - 27 May 2020 11:48 #169027
by microsprintbuilder
THCAD via 7i96-7i84D mode 2 mpg encoder input was created by microsprintbuilder
I am using a 7i84D in mode 2 as a remote card for a WIRE EDM project. I need to read the voltage to adjust the feed rate. I have a THCAD-300 connected to the spark box voltage and it outputs a square wave signal confirmed by an oscilloscope and reading hal scope reading 7i84 encoder 0 A phase. without a B phase the count will not work. I've tried several commands to change the counter mode to 1 like std encoders to ignore phase B. Is this option not available? Is there another way to achieve this. I have hooked up an mpg wheel and can see a count so the card is working. The card layout is 7i96 with 7i73 pendant on serial and 7i85 on the 7i96 expansion port with the 7i84D on its serial.
Thanks in advance
Thanks in advance
Last edit: 27 May 2020 11:48 by microsprintbuilder.
Please Log in or Create an account to join the conversation.
27 May 2020 01:50 #169030
by PCW
Replied by PCW on topic THCAD via 7i96-7i94D mode 2 mpg encoder input
Do you mean 7I84D?
Please Log in or Create an account to join the conversation.
- microsprintbuilder
- Offline
- Elite Member
Less
More
- Posts: 165
- Thank you received: 4
27 May 2020 11:36 - 27 May 2020 11:49 #169115
by microsprintbuilder
Replied by microsprintbuilder on topic THCAD via 7i96-7i94D mode 2 mpg encoder input
Yes , I’ll edit that. In the end I guess I need a velocity, not a count to feed into my comp I’ve made to slow or speed up the feed rate.
Last edit: 27 May 2020 11:49 by microsprintbuilder.
Please Log in or Create an account to join the conversation.
27 May 2020 15:15 #169133
by PCW
Replied by PCW on topic THCAD via 7i96-7i94D mode 2 mpg encoder input
Yeah, the 7I84 encoder counter is really just meant for MPG usage so does not have the
fancy velocity estimation hardware that a normal encoder has. It would be better to wire
the THCAD to a standard encoder input.
fancy velocity estimation hardware that a normal encoder has. It would be better to wire
the THCAD to a standard encoder input.
Please Log in or Create an account to join the conversation.
- microsprintbuilder
- Offline
- Elite Member
Less
More
- Posts: 165
- Thank you received: 4
27 May 2020 15:48 #169135
by microsprintbuilder
Replied by microsprintbuilder on topic THCAD via 7i96-7i94D mode 2 mpg encoder input
That would require adding a long cable from the spark box to the control box. This something I was trying to avoid. Could I instead measure the voltage via the analog inputs use a voltage divider? Max voltage would be 160 DC.
Please Log in or Create an account to join the conversation.
27 May 2020 17:25 #169138
by PCW
Replied by PCW on topic THCAD via 7i96-7i94D mode 2 mpg encoder input
Is the 160V common close to ground potential?
Is it + 160V?
Is it + 160V?
Please Log in or Create an account to join the conversation.
- microsprintbuilder
- Offline
- Elite Member
Less
More
- Posts: 165
- Thank you received: 4
27 May 2020 20:37 #169152
by microsprintbuilder
Replied by microsprintbuilder on topic THCAD via 7i96-7i94D mode 2 mpg encoder input
yes, if you mean its DC positive.
Please Log in or Create an account to join the conversation.
27 May 2020 22:59 #169164
by PCW
Replied by PCW on topic THCAD via 7i96-7i94D mode 2 mpg encoder input
OK then you should be able to read that with the 7I84/7I84D
A 75K 1% resistor in series the input should give you
about 160V full scale
A 75K 1% resistor in series the input should give you
about 160V full scale
Please Log in or Create an account to join the conversation.
28 May 2020 07:40 #169201
by rodw
So Peter what card should we add to a 7i76e if we want to run encoders?
Replied by rodw on topic THCAD via 7i96-7i94D mode 2 mpg encoder input
Yeah, the 7I84 encoder counter is really just meant for MPG usage so does not have the
fancy velocity estimation hardware that a normal encoder has. It would be better to wire
the THCAD to a standard encoder input.
So Peter what card should we add to a 7i76e if we want to run encoders?
Please Log in or Create an account to join the conversation.
- microsprintbuilder
- Offline
- Elite Member
Less
More
- Posts: 165
- Thank you received: 4
28 May 2020 11:28 - 28 May 2020 11:29 #169216
by microsprintbuilder
Replied by microsprintbuilder on topic THCAD via 7i96-7i94D mode 2 mpg encoder input
Attachments:
Last edit: 28 May 2020 11:29 by microsprintbuilder.
Please Log in or Create an account to join the conversation.
Time to create page: 0.144 seconds