Crystal Vision
Installation
Indigo 4 User Manual R1.7
28
09/08/2012
2.9 Select the cooling mode
Three cooling modes can be selected using a switch on the upper edge of the lower
control panel PCB. The three modes available are: normal, quiet and maximum.
Front panel hardware settings – cooling mode (lower PCB)
Switches 1 & 2 of the four-position DIL switch control the three cooling modes as
follows:
Levers 1 & 2
Function
Notes
Both up
Normal
cooling
Both fans run continuously increasing in speed as the temperature
inside the frame goes up.
1 down, 2 up
Quiet mode
For use with a lightly loaded frame in low ambient temperatures.
When the frame temperature is below approximately 45°C the
panel fans are switched off and the PSU fans runs at minimum
speed. If the frame temperature goes above 45°C it reverts to
normal cooling until the frame temperature again falls below 42°C.
1 up, 2 down
Max cooling
mode
In Maximum cooling mode all fans run at near maximum speed.
Fan speed increases to maximum at high frame temperature. This
mode is ideal for equipment bays where noise is not a concern.
Both down
Reserved for
future use
Operates as normal mode with current software.
Note:
Quiet mode is dependent on PSU and PSU fans not being in an alarm state.
Switches 3 and 4 are not used.
Only one of the fans is essential in normal operation. If one of the fans should fail, the
closed frame can still operate indefinitely with an ambient temperature of 40°C.
Warning:
Although it is possible to operate the frame with the front panel open the frame may not
meet electromagnetic compatibility (EMC) requirements in this condition.
Slot numbers
In an Indigo 4 frame, the slot or location numbers are determined by the position of the
card in the frame.
