Crystal Vision
Introduction
There are three cooling modes: normal, quiet and maximum.
With normal cooling both fans run continuously, increasing in speed as the temperature inside
the frame goes up.
Quiet mode is intended for a lightly loaded frame in an environment where ambient noise is a
concern. When the frame temperature is below approximately 45°C the panel fan is switched
off and the PSU fan runs at minimum speed. If the frame temperature goes above 45°C it
reverts to normal cooling and goes back to quiet mode when frame temperature falls below
42°C.
In Maximum cooling mode both fans never run below 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.
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.
The Indigo PSU has a built-in processor, which communicates with the front panel display
processor (referred to as a PIC) and monitors power rail voltage levels (+5.75V and -6.0 V)
and the PSU fan speed. The PSU also stores its own serial number in non-volatile memory.
The panel processor regularly receives status updates from the PSU processor about power
rails and fan speed. This allows the front panel to update its status LEDs and control the
alarm relay. The relay contacts are available on the Remote 2 connector on the rear of the
frame.
There are four two-colour LEDs on a front panel, with green indicating a normal condition and
red an abnormal condition. If the LED is unlit, this indicates an inactive condition such as a PSU
fan not running with the front panel closed. The yellow comms LED is no longer supported.
Indigo 1 LEDs
Indigo 1 User Manual R1.14
5
27 February 2020
