Table 22 Operating temperature de-rating specifications
Operating temperature de-rating
Specifications
Up to 35°C (95°F)
Maximum temperature is reduced by 1°C/300 m (1°F/547 ft) above 950
m (3,117 ft).
35°C to 40°C (95°F to 104°F)
Maximum temperature is reduced by 1°C/175 m (1°F/319 ft) above 950
m (3,117 ft).
40°C to 45°C (104°F to 113°F)
Maximum temperature is reduced by 1°C/125 m (1°F/228 ft) above 950
m (3,117 ft).
Standard operating temperature
The following table lists standard operating temperature specifications.
Table 23 Standard operating temperature specifications
Standard operating temperature
Specifications
Continuous operation (for altitude less than 950 m or
3117 ft)
10°C to 35°C (50°F to 95°F) with no direct sunlight on the equipment.
Expanded operating temperature
The following table lists expanded operating temperature specifications for the R740xd system.
Table 24 Expanded operating temperature specifications
Expanded operating temperature
Specifications
Continuous operation
5°C–40°C at 5% to 85% RH with 29°C dew point.
Note:
Outside the standard operating temperature (10°C–35°C), the
system can operate continuously in temperatures as low as 5°C and
as high as 40°C.
For temperatures between 35°C–40°C, de-rate maximum allowable
temperature by 1°C per 175 m above 950 m (1°F per 319 ft).
≤ 1% of annual operating hours
–5°C–45°C at 5% to 90% RH with 29°C dew point.
Note:
Outside the standard operating temperature (10°C–35°C), the
system can operate down to –5°C or up to 45°C for a maximum of
1% of its annual operating hours.
For temperatures between 40°C and 45°C, de-rate maximum allowable
temperature by 1°C per 125 m above 950 m (1°F per 228 ft).
Note:
When operating in the expanded temperature range, system performance may be impacted.
Note:
When operating in the expanded temperature range, ambient temperature warnings may be reported in the
System Event Log.
Technical specifications
30
R740xd Owner's Guide
