Fujitsu IRF-1S series User Manual page 18

Chapter 1 - Getting Started
If the drive bay area reaches a temperature of 50°C (122°F) an audible alarm will
sound, the front panel Fan Status LED will toggle amber green, and the monitoring
software will post a warning message. These notifications give the user a warning
that some condition is causing the enclosure temperature to exceed the preset
value, and an action is required by the user to determine the cause and take
corrective measures. It may be due to a blockage of air flow or a low fan speed.
If any controller reaches a temperature of 65°C (149°F) an audible alarm will
sound, the front panel Fan Status LED will alternate amber and green, and the
monitoring software will post a warning message. If the temperature on any
controller continues to rise and reaches 71°C (159°F), the controller will flush its
cache and shutdown. If it is the only controller (Simplex mode) or the only
remaining controller (surviving controller from a failed over operation) then the
controller will also spin down the disk drives at this temperature.
If any power supply reaches 85°C (185°F) the power supply will shut down.
The SES Controller card has a firmware-based VT-100 interface which provides an
option to manage fan speed. This option provides a whisper mode fan operation
for noise sensitive environments. When enabled (default), and based on a set of
conditions, the software will manage the cooling fans RPM speed to maintain the
enclosure temperature while minimizing noise levels. Refer to "Enclosure Fan
Speed Control" on page 122 for more details on using this option.
A manual override of the fan speed control is available for special circumstance
environments. Referring to the illustration on the preceding page, two jumpers are
provided on the fan module printed circuit board to override the software control
of the fan speeds. This hardware setting routes full power voltage to the fans for
maximum operational speed, which is greater than the maximum speed set by the
automatic software control. This configuration is normally used when fan speed
noises are not an issue, and the ambient operating temperature is at or above 30°C
(86°F), thus ensuring that maximum available cooling is being provided.
The jumpers JP1 and JP2 by default are offset, which enables the automatic fan
speed control. The jumper JP1 controls Fan 0 and JP2 controls Fan 1. Placing the
jumper on both pins for each jumper will override the automatic setting and
configure the fans to maximum power.
6
Cooling Fan Module