User Port Grounding; User Port Controls And Indicators - Advanced Energy MDX II User Manual

®
Advanced Energy

User Port Grounding

The User port features multiple ground pins. All of these pins are "single point connected"
internally to analog, digital, and chassis ground on the MDXII logic card.
The simplest ground connection system for these pins ensures a well-connected ground at the
MDXII chassis. Thus you can tie together User port pins 9, 10, 19, 36, and 37 and connect
them to the system ground and/or the User port shield. If connecting a ground pin to both the
system ground and the User port shield causes ground loop problems, you can disconnect it
from one of the grounding points.
The exception is pin 10 (IN COM.A), which is a dedicated floating reference for the RAMP
IN.A and LEVEL IN.A signals. Pin 10 (IN COM.A) is not connected to ground on the logic
card; you must attach this pin to ground at the system (far) end of the User port cable.
Note: If you suspect ground loop problems, reference each of the above pins separately to its
designated ground (see Table 9-1 on page 9-7).

USER PORT CONTROLS AND INDICATORS

You can give control to the User port by pressing the ANALOG switch on the control panel.
Some of the functions you can control from the control panel and through the serial port are
also available through the User port signal pins.
The User port overrides other control modes for the following:
• On and off
• Target
• Tap
• C Hold
• HALO
You cannot control the following through the User port:
• Transfer control from one interface to another.
• Store parameters; they are in effect only when the MDXII unit is looking at the User pins;
if the voltage on the pins changes, the specific parameter changes.
• Specify target life.
• Modify run time.
• Set out-of-setpoint timer.
• Access voltage-arc-detection functions.
• Set power or current limits.
9-6 User Port Connection, Controls and Indicators 5700262-R