My 7i76e Connection Sheet

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21 Mar 2021 09:06 - 21 Mar 2021 09:13 #203088 by Aciera
Replied by Aciera on topic My 7i76e Connection Sheet
@newbynobi

Thanks again for the connection sheets.

However there seems to be a minor flaw in it concerning the Field Power connection as pointed here out by PCW: forum.linuxcnc.org/plasma-laser/40517-do...ons?start=120#193043

Nothing should connect to TB1 pin 5 (VIN)
VFIELD (TB1 pins 1..4) is where +24V power goes



From the manual:

The isolated field I/O on the 7I76E runs from a switching power supply that can be powered by field power or a separate supply (VIN) with ground common with field power.Normally the 7I76E will be powered with field power and an on card jumper, W1 allows VIN to be connected to field power. If you wish to use a single power supply for the 7I76Es field outputs and field logic power, W1 should be placed in the left hand position. This connects field power to VIN. If you wish to use a separate supply for VIN, W1 Should be placed in the right hand position.


Your schematics works but the bulk of the field power current goes through the Jumper W1 instead of just the power for the field I/O processor. Also manipulation of the jumper when powered might damage the output drivers.
Last edit: 21 Mar 2021 09:13 by Aciera.

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10 Apr 2021 12:45 - 10 Apr 2021 12:59 #205520 by BeagleBrainz
Quick question regarding pull up resistors and opto couplers driving the input pins. As my servo driver uses opto couplers for outputs.

With VField @ 24v a 2k 0.5 Watt resistor would suffice per input ?

(24^2)/2000 = 0.288W

As the alarm output from the driver pulses a 1hz the HAL flip flop comp would be the best way to catch the alarm signal ?
Last edit: 10 Apr 2021 12:59 by BeagleBrainz.

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10 Apr 2021 13:56 #205525 by PCW
Replied by PCW on topic My 7i76e Connection Sheet
A resistor would be needed only if the optocoupler common was ground
if the optocoupler can supply 24V to an input an pullup resistor is not needed

2K 1/2 W should be fine if a pullup is needed

A flipflop component with its clock driven by the alarm signal
(and data pin tied to '1') can detect the alarm signal

A better choice might be the oneshot component set for a bit over 1/2 second
The oneshot component has the advantage that it can be set up to trigger
on both edges of the alarm signal and may not require resetting
The following user(s) said Thank You: BeagleBrainz

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10 Apr 2021 16:48 #205539 by BeagleBrainz
The optos are connected internally to a common ground.

I’ll look into the one shot as well.

Once again thanks for your help.

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12 Sep 2021 20:57 #220368 by fons
Replied by fons on topic My 7i76e Connection Sheet
the mesa 7i76 e had 2 mpg inputs  can you add 2 more  ?

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12 Sep 2021 21:51 #220371 by PCW
Replied by PCW on topic My 7i76e Connection Sheet
More could be added to either of the parallel expansion ports
(or a 7I73 could be added to the serial expansion port, adding 4 more MPG channels)

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16 Sep 2021 22:18 - 17 Sep 2021 21:21 #220821 by fons
Replied by fons on topic My 7i76e Connection Sheet
can i find somewhere an example how to setup a gearbox in the hal file
i have 4 speed settings combined 16 gears
28 35 45 56 70 90 112 140 180 224 280 355 450 560 700 900 rpm
i will us use a vfd to control the motor 1450rpm 7.5kw
Last edit: 17 Sep 2021 21:21 by fons.

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