Conditioned Power Center 27
Section 7 - Options
7.4 Phase Loss/Low Voltage Detection and Protection When equipped with the power management option, the 7500 ION monitor also provides:
1. Protection from the loss of one or more input phases
2. Protection for a low-voltage condition occurring on one or more phases (Protection from a high-voltage
conditions is also optionally available)
Should a phase loss or low voltage occur, the 7500 ION will “shunt” trip the power conditioner breaker within 50
msec. of the occurrence. In this event, turn off the load. Then re-energize the GPI Series 2000 input breaker to
return power to the power conditioner. The 7500 ION monitor may then be used to diagnose the event that
caused the shunt trip. If the power conditioner immediately trips again once it is energized, this indicates that the
low voltage or phase loss condition that originally caused the shunt trip still exists and must be corrected prior to
restoring operation. (Shunt trip delays other than 50 msec. can be programmed via the 7500 ION monitor.
Consult the manufacturer for instructions or assistance.
NOTE: Any phase that drops below 80% of nominal voltage is considered a “phase loss” condition. The
7500 Ion monitor is powered from phase A of the transformer secondary. If the 7500 Ion monitor appears
to have no power, this is an indication that phase A may be lost. Caution should be exercised, however,
as phases B and C may be still be energized.
If equipped with the external EMO option, the power conditioner will be provided
with a set of terminals as a point for connecting the power conditioner’s EMO
circuit to a remote pushbutton or as a means to integrate it into the master EMO
circuit frequently found in computer rooms or semiconductor production facili-
ties. The external EMO contact terminal block is marked ‘TB1” and is located
inside the power conditioner on the rear of the panel immediately behind the
main circuit breaker as shown in Figure O to the right. The external EMO con-
tacts are clearly marked. When connected to an external EMO circuit, the acti-
vation of any EMO pushbutton or control anywhere in the master circuit will acti-
vate the shunt trip circuit of the power conditioner.
When equipped with seismic anchorage brackets, the power conditioner will meet the requirements of SEMI S2-
0200 Paragraph 19 . The seismic anchors are designed to allow the power conditioner to withstand a horizontal
loading of 63% of the power conditioner’s weight acting on its own center of mass. Seismic anchorage brackets
are designed to prevent the power conditioner from overturning during seismic activity and possibly injuring per-
sonnel. Consult the specification sheet found in Section 10 of this manual for detailed information and drawings
showing physical dimensions, anchorage locations, weight distributions, and center of mass locations. Seismic
anchorage kits may be ordered for any installation and are not restricted solely to SEMI applications .
Figure O