0120028-J0 Rev F
18
Bafe tray
Bafe tray
Fan tray
Converter
shelves
Figure 6 — Multi-shelf system mounting
NOTE:
When the eLimiter+ system is operating normally at maximum rated load, the shelf
level rate of heat dissipation exceeds the allowable limit of 27.9 W/sq.ft. per Section
4.1.6 of GR-63-CORE (Issue 6).
Alpha recommends leaving a minimum of 5.0 (7.2) inches vacant vertical rack space
for each 23" (19") shelf installation to meet the required shelf-level rate of heat dissipa-
tion. To comply with this limit, additional empty vertical frame space must be added as
shown in Table B below. In addition, special equipment room cooling may be required.
Table B — Vertical Frame Spacing Requirements (NEBS GR-63-Core)
Installation Type Additional Empty Vertical Frame
Space needed for Compliance
(in feet)
Maximum Number of EUT Chassis
ableto be installed in 7 ft frame and
maintain compliance
19-inch frame 2.41 1
23-inch frame 1.83 2
6�4�2 Thermal Management with Fan Tray
If operating more than 1 continuous shelf a fan tray is required. One fan tray can be used for up to three shelves.
Three contiguous shelves require a fan tray and two baffles to meet the specified cooling requirements. Install the
fan tray directly below the three converter shelves and a baffle tray below the fan tray. In addition, install a baffle tray
above the converter shelves. Up to nine converter shelves can be installed in a rack, provided each three contiguous
shelves has fan cooling.
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