External On/Off Control For Dual Line Units; Figure 9-5. Wiring For External On/Off Control - Advanced Energy MDX II User Manual

®
Advanced Energy

EXTERNAL ON/OFF CONTROL FOR DUAL LINE UNITS

Some MDXII units are shipped with User port pins 7 and 14 configured so that the output on
and off signals can be separately controlled (hence the term "dual-line"). Figure 9-5 on page
9-4 shows how to wire these units for dual-line or single-line on/off control.
The following situations are applicable when creating a dual-line control system:
• When both the pin 7 and pin 14 relays are open, the supply is off. To turn on the supply,
first close pin 14 (nothing happens) and then close pin 7 (the unit turns on).
If you are trying to turn on the supply and you close pin 7 first, the message "Remote Off
Active" displays on the front panel. To clear this error, you must open pin 7.
• When both pin 7 and pin 14 relays are closed, the power supply is on. To turn off the
supply, open pin 14 (the unit turns off).
To create a single-line control system, tie pin 7 and pin 14 together and use a single "on/off"
relay. When this relay is opened, the MDXII unit turns off. When closed, the MDXII unit turns
on.
Note: Many MDXII units are shipped with single-line control already hard-wired in place. To
control the on/off from the User port on single-line units, simply wire pin 7 with a relay.

Figure 9-5. Wiring for external on/off control

9-4 User Port Connection, Controls and Indicators 5700262-R