32
Cooling fan sensors
Each power supply includes two fans. The normal range for fan speed is 4,000 to 6,000 RPM. When a
fan speed drops below 4,000 RPM, the EMP considers it a failure. The following table lists the description,
location, and alarm condition for each fan. If the fan speed remains under the 4,000 RPM threshold, the
internal enclosure temperature may continue to rise. Replace the power supply reporting the fault.
During a shutdown, the cooling fans do not shut off. This allows the enclosure to continue cooling.
Temperature sensors
Extreme high and low temperatures can cause significant damage if they go unnoticed. Each power supply
has one temperature sensor.
When a temperature fault is reported, it must be remedied as quickly as possible to avoid system damage.
This can be done by warming or cooling the installation location.
When a power supply sensor goes out of range, the Fault/ID LED illuminates amber.
Power supply module voltage sensors
Power supply voltage sensors ensure that an enclosure’s power supply voltage is within normal ranges.
There are three voltage sensors per power supply.
Table 15
Cooling fan sensor descriptions
Description
Location
Event/Fault ID LED condition
Fan 1
Power supply 1
< 4,000 RPM
Fan 2
Power supply 1
< 4,000 RPM
Fan 3
Power supply 2
< 4,000 RPM
Fan 4
Power supply 2
< 4,000 RPM
Table 16
Temperature sensor descriptions
Description
Normal operating
range
Warning operating
range
Critical operating
range
Shutdown values
Onboard temperature 1
0
C–70
C
None
None
None
Onboard temperature 2
0
C–70
C
None
None
None
Onboard temperature 3
(Capacitor temperature)
0
C–70
C
None
None
None
CM temperature
5
C–50
C
5
C,
50
C
0
C,
55
C
None
Table 17
Power supply temperature sensor descriptions
Description
Normal operating range
Power supply 1 temperature
–10
C–80
C
Power supply 2 temperature
–10
C–80
C
Table 18
Voltage sensor descriptions
Sensor
Event/Fault LED condition
Power supply 1 voltage, 12V
< 11.00V
> 13.00V
