Re: Gecko E-Stop recommended configuration

Tom,

Brush DC motors are able to run without benefit of any electronics,
step motors are not. Brush DC servo systems are equiped with
protection circuits to prevent against most runaway faults but not
all, such as a shorted transistor.

The only sure fire way to stop a motor is to remove power from it.
The question is how.

1) Shut off the AC input to the supply. This is easiest on the switch
and the drives but the power supply filter capacitor "hold-up" time
may be a second or more.

2) SPDT switch in the DC supply circuit. Common to the drive's "+"
supply input, N.C. to the power supply "+" terminal, N.O. to the
drive's "-" supply. This has the benefit of dynamically breaking the
motor after disconnect from the power supply. The switch contact
rating is higher and there must be at least a 1,000 uF capacitor
across the drive's power supply inputs at the drive. This is tough on
the cap and switch.

3) For more mundane (non-emergency) faults in multiple axis setups
please see the "4 axis reset manager" pdf in the "files section of
this group.

Hope that helps. I am writing an applications section for the servo
drives. It should be finished in a few weeks. I am trying to keep it
from having as many pages as Tolstoy's "War and Peace".

Mariss

--- In CAD_CAM_EDM_DRO@y..., "Tom Eldredge" <harmonyt@r...> wrote:
> Mariss, and other Gentlemen,
>
> If this has not been already covered, do we need an application
note on this subject?
>
> Many of us are using or are planning to use the G320, 340 drives.
What is the recommended proceedure for E-stopping a G320 servo loop?
It is my understanding that for safety reasons, the power is to be
removed from the motor/drive, and IC logic is not to be depended upon
to actually stop motion in an emergency situation. If so, where
should we put in the relay to do so, in the power line to the amp, or
inside the motor/drive loop? If not, should we simply use the
disable input to the drive for emergencies?
>
> Thanks again,
>
> Tom Eldredge
>
>
>
> [Non-text portions of this message have been removed]