Chapter 2 Specification Summary 2-9
Shutdown 58°C
2.1.14.2 Fan Monitoring and Control
Fan Control Both fans controlled simultaneously
Fan Speed Four Steps: 8 V, 10 V, 11 V, 12 V
Control Matrix
Monitoring Individual Fan Fail Warnings (Back Fan Fail), (Front
Fan Fail)
Front/CPU Cooling Fan
The CPU fan is required and supplied by Sun for CPU modules with straight fin
heatsinks (e.g., 360 MHz, part number 501-5148-xx; 440 MHz, part number 501-5149-
xx). Refer to FIGURE C-6 on page C-9 and FIGURE C-7 on page C-10 for
configuration information. An OEM-supplied front fan may also be required with
CPU modules with pin fin heatsinks depending on system thermal characteristics.
Boot Command Used
env-monitor Setting
[1]
1. Applicable to the Solaris level only for fan speed control. The fans always run at 12 V at the OBP level. Refer to
Appendix D.14 “ASM Operation” for the definition of the env-monitor settings.
boot boot -r
[2]
2. The boot -r reconfiguration command is required each time the machine is booted to attach the ASM driver.
enabled-with-fans 12 V Fan voltage depends on measured temperature
readings:
enabled 12 V 8 V
disabled 12 V 12 V
disabled* 12 V 12 V
Reading of
thermistor under
CPU module
heatsink
Voltage to
Front/CPU Fan
(J3603)
Voltage to
Back Fan
(J3602)
0
o
C—27
o
C8V 8V
28
o
C—39
o
C10V 10V
40
o
C—51
o
C11V 11V
52
o
C — 111
o
C12V 12V
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