On Thu, 12 Apr 2018, Condit Alan via Emc-users wrote:
Date: Thu, 12 Apr 2018 13:40:31 -0700
From: Condit Alan via Emc-users <emc-users@lists.sourceforge.net>
To: "Emc-users@lists.sourceforge.net" <Emc-users@lists.sourceforge.net>
Cc: Condit Alan <condita...@yahoo.com>
Subject: [Emc-users] 7i76 spindle reverse relay
I tried sending this message yesterday and again today but apparently it
didn??t go through. So I am trying again. I am trying to send two schematics
(.png) files to help clarify my question.
I am re-wiring my lathe controller box using a 5i25 & 7i76 pair from Mesanet.
I am using a Potter-Brumfield K10P-11DT5-25 DPDT relay to reverse the PMDC
spindle motor. The relay data sheet says max 900mw power consumption for the
coil. So can I use the Spindle_dir switch to directly control the relay or do
I need to use a transistor to drive the relay from the Field_IO+ 24V supply.
You can drive the relay directly wih the 7I76 OPTO output but the relay
requires a flyback diode (cathode to +24V side of coil)
Your 1W relay should draw about 41 ma at 24V and the 7I76 OPTO is rated 50 mA
at 100V
On the schematic I show connecting the Spindle-, SpindleOut, and Spindle+ to a
potentiometer but that is just to show that it is actually replacing a
potentiometer connected to the Cycletrol 150 controller.
As long at the drive supplies 5 to 15V, this should be fine
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Peter Wallace
Mesa Electronics
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