On Fri, 28 Dec 2018, Greg Bentzinger via Emc-users wrote:
Date: Fri, 28 Dec 2018 03:20:35 +0000 (UTC)
From: Greg Bentzinger via Emc-users <emc-users@lists.sourceforge.net>
Reply-To: Greg Bentzinger <skullwo...@yahoo.com>,
"Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net>
To: "emc-users@lists.sourceforge.net" <emc-users@lists.sourceforge.net>
Cc: Greg Bentzinger <skullwo...@yahoo.com>
Subject: [Emc-users] [utf-8] 7i77 ? Trying to understand TB2
.
7i77 ?? Trying to understand TB2
Pin 1 ?? VFIELD ?? FIELD Power 8-32V
Pin 2 ?? VFIELD ?? FIELD Power 8-32V
Pin 3 ?? VFIELD ?? FIELD Power 8-32V
Pin 4 ?? VFIELD ?? FIELD Power 8-32V
Pin 5 ?? VIN ?? FIELD I/O Logic Power 8-32V
Pin 6, 7 ?? NC
Pin 8 ?? Ground ?? COMMON
So ?? are pins 1-4 common to each other, not common and can be supplied
different voltages, common but redundant to allow for greater current
transfer. Everyone I have ask has given completely different and conflicting
answers. Since I have no idea what the encoder current draw will be I will be
supplying TB1 with its own 5V powersupply and thus W1 will short the 2 pins on
the right (farthest from the DB25) I have a second 24V powersupply which I
have wired to each pin 1-5 with ground on pin 8. My notes show I did this
wiring 12/3/17 and have yet to actually power it up as have yet to obtain a
clear definitive answer as to if this is proper or a potential smoke machine.
Greg
.
Pins 1..4 are common. This is because you could have as much as ~4 Amps of
load current and for compatibility with other cards that have split
field supplies.
Its generally better to supply 5V at the 7I77s TB1 when older, higher power
encoders are used or more that 3 encoders are needed. If you do this, make
sure that the FPGA card is jumpered so it _does not_ supply cable power to the
7I77
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