GE Industrial Solutions GE ZENITH SERIES MDU - Manual (Page 17)

Installation Procedures
GE Z ENITH C ONTROLS
MDU Owner’s Manual
601 S HILOH R OAD January 2013
Plano, TX 75074 Page 17
3.7.6. System Power-Up Procedure
Note: Before applying utility power to the unit, the electrician performing the
installation and/or a factory authorized representative should be present to
verify that the following steps have been performed properly.
1. Confirm that the MDU’s main input circuit breaker is in the “off” position.
2. Ensure that all of the MDU’s output circuit breakers or sub-feed breakers are in the “off
“position.
3. The installing contractor should now verify that the input voltage to the unit matches
the input voltage rating of the unit as identified on the system’s legend label found on
the interior of the front door. The input voltage rating also appears on the transformer
label located on the top of the high isolation transformer positioned at the rear of the
unit.
4. Ensure that the power J box has been installed correctly (i.e. proper phase rotation and
safe grounding practices as indicated above).
Warning: Ensure that the above conditions are met before applying incoming power to
the MDU.
5. Apply Power to the unit
6. Measure for the proper MDU input voltage. This should match the units rating (+ 5% to
-10% from nominal rating).
7. Check the phase rotation (clockwise) and voltage at the power J box.
8. Check to ensure the emergency power off (EPO) light is on.
9. Energize the MDU main breaker by setting the toggle to the “on” position.
Note: If the main breaker trips to the “off” position when energized, contact GE ’s
service division at (800)637-1738 as this is an indication of a fault in the unit.
10. Perform an EPO check by depressing the EPO button and assuring that the main
breaker shunt trips.
11. Manually reset the main breaker to the “on” position. This may require that you
manually trip the lever all the way to the “off” position.
12. Check the output voltages. If the output voltages are not within acceptable limits, it
may require the taps on the transformer be changed. Each transformer is labeled with
the tap connections. All tap changes must be done with the input power turned off.
13. The MDU is now ready to sequentially energize the branch circuit breakers.
14. Units equipped with monitoring can be activated by depressing the monitor on/off
button located to the left of the LCD display. See System Monitoring on page 23 of this
manual for monitor operation.
Note: Equipment attached to the MDU may require special start up procedures. Please
consult the individual manufacturers for these requirements.