Alpha Technologies FBE2322 Enclosure System - Manual (Page 31)

31 031-314-B0-001, Rev. A (12/2012)
3.0 Environmental Control Systems
3.1 FBE2322 Enclosure Environmental Control Overview
The FBE2322 Enclosure system has four integrated environmental control systems and an alternative
emergency backup system. The following options are available:
• Convection Cooling
• Fan & Filter Cooling
• AC Air Conditioning
• Heat Exchanger
• Emergency Fan (Optional for Air Conditioning/Heat Exchanger units)
The following sections provide further information for each environmental control option. For more
information about environmental systems not addressed in this manual, contact your Alpha sales
representative.
3.2 FBE2322 Fan & Filter Cooling
FBE2322 Fan Control Boards:
• 48VDC, DL Fan Control, 25-45C,W/SD, RMB (Alpha p/n 704-696-21)
• 24VDC, DL Fan Control, 25-45C,W/SD, FBE (Alpha p/n 704-696-31)
General operation:
Fans are off below 25ºC. Fans turn on at 25ºC and increases from 50% to 100% full speed with
increased enclosure temp from 25ºC to 45ºC. Over temp alarm is 55ºC. (Temp Tolerance +/- 2.5ºC).
Features:
• Two 118 CFM fans are powered by a variable speed temperature control. Fans turn off below
25ºC. Fans turn on at 25ºC and increase from 50% to 100% full speed with increased enclosure
temperature from 25ºC to 45ºC.
• Dual Fan Control PCBA has a green LED to indicate proper function, a red LED to indicate an alarm
condition and a push button test feature. When the button is pushed the fans will momentarily ramp
up to full speed and the alarm condition will be indicated. After this test sequence the fans will go
back to normal speed and the alarm will clear with green LED indicated.
• 24 or 48VDC input power.
• 5A fuse or circuit breaker is required (Not provided unless configured with Cordex shelf or GMT fuse
panel options).
• Maximum power draw for two fans is 20W.
• One form C dry contact alarm, open on alarm (Fan fail or 55ºC over temp, or LVD).
• Low Voltage Disconnect (LVD) input below 42VDC will shut off fans.
Cooling system alarm can be an indication that filters need to be cleaned or that fans may need to be
replaced. It can also indicate that the battery buss is low or the cooling system circuit breaker is off.
NOTE: