drive enable wiring
05 Nov 2014 20:13 #52812
by cmtunnel
drive enable wiring was created by cmtunnel
I'm having trouble figuring how to wire my drives so linuxcnc can shut them down. The drives are amc 12a8 drives and use inhibits. So I think the idea is to set up relays that will take the inhibit pin to ground when linuxcnc wants to shut the system down. The attached drawings are my system as it is now. I am hoping someone can modify the drawings to show what mods i need to make. There are 6 enable inputs from linuxcnc and i have inhibit, inh+, inh- at the drives but i think im only supposed to use the first one, pin 11. Not sure what to do here. Thanks.
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05 Nov 2014 22:26 #52820
by PCW
Replied by PCW on topic drive enable wiring
The easiest thing would be to use SPDT relay's Normally Closed (NC)
contact to short the drives pin 11 to drive ground until linuxcnc enables the drives
by powering the relay. You may be able to wire all the pin 11 inhibit inputs in parallel
and use a single relay for this.
contact to short the drives pin 11 to drive ground until linuxcnc enables the drives
by powering the relay. You may be able to wire all the pin 11 inhibit inputs in parallel
and use a single relay for this.
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06 Nov 2014 01:36 #52827
by cmtunnel
Replied by cmtunnel on topic drive enable wiring
so which pins are used on the 7i77? There are two enable leads coming from the card but only 1 pin11. I'm sure the answer is simple but I'm not that saavy with wiring & relays. Sounds like the two enables are connected to a relay then the relay is also wired to the inh on the drive and takes pin11 to ground when tripped by enable wiring from 7i77. I think i understand the idea of how it works but i'm not so sure of the wiring yet.
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06 Nov 2014 01:44 #52828
by PCW
Replied by PCW on topic drive enable wiring
drive pin 11 = /INH --> relay NC contact
drive pin 2 =GND--> relay COM contact
7I77 field output --> relay coil-1
Field power common --> relay coil-2
drive pin 2 =GND--> relay COM contact
7I77 field output --> relay coil-1
Field power common --> relay coil-2
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06 Nov 2014 20:18 #52873
by cmtunnel
Replied by cmtunnel on topic drive enable wiring
so are you saying to connect all three enable(+)'s from tb5 pin to relay coil -1. And the three enable(-)'s to the relay COM contact?
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06 Nov 2014 20:32 #52874
by PCW
Replied by PCW on topic drive enable wiring
No
Here's an example connection using field output 0
7I77 field output-0 TB8 pin 17 to relay coil-1
7I77 field common TB2 pin 8 to relay coil-2
relay NC contact to Drive 0,1,2 pin 11 (/INH)
relay COM contact to Drive 0,1,2 pin 2 (Drive GND)
Here's an example connection using field output 0
7I77 field output-0 TB8 pin 17 to relay coil-1
7I77 field common TB2 pin 8 to relay coil-2
relay NC contact to Drive 0,1,2 pin 11 (/INH)
relay COM contact to Drive 0,1,2 pin 2 (Drive GND)
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06 Nov 2014 20:41 #52875
by cmtunnel
Replied by cmtunnel on topic drive enable wiring
so i won't be using the ena pins on tb5 at all?
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06 Nov 2014 23:12 #52880
by PCW
Replied by PCW on topic drive enable wiring
Nope, unless you jumper the drives for enable rather than inhibit inputs (requires soldering)
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07 Nov 2014 02:29 #52884
by cmtunnel
Replied by cmtunnel on topic drive enable wiring
Ok, I think that what was hanging me up. Thanks for the info.
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08 Nov 2014 05:10 - 08 Nov 2014 05:13 #52924
by cmtunnel
Replied by cmtunnel on topic drive enable wiring
I have a few of these ( attached file) relays around. Will these work ok? It's a t9ap5d52-24
Last edit: 08 Nov 2014 05:13 by cmtunnel.
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