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12.5 Temperature De-Rating
WARNING: For the majority of UK installations, it is reasonable to assume a
worst case cabinet temperature range of 0°C to 65°C.The UPS Solution must
be derated to at least these values to help ensure correct operation.
12.5.1 Power output
The Alpha FXM1100 and FXM2000 UPS units offer a maximum power output of 1100VA
and 2000VA respectively. See section 4.1. In high ambient temperatures, the maximum
power available decreases as the FXM UPS units reach the limits of their operating
range.
The FXM1100 UPS unit is de-rated by 1.25% for every degree above 55°C. The
FXM2000 UPS unit is de-rated by 1.0% for every degree above 50°C. Table 12-6 below
gives specific figures showing how this affects the maximum power output available.
Temperature
65°C (UK worst case)
Table 12-6: Maximum Output Power against Ambient Temperature
Version
7
Last Editor
Ore Oluwatudimu
Document
UPS Solution General Handbook
Name
Copyright ã Siemens plc 2017 All Rights Reserved
Figure 12-4: Battery Charging Cycle
Ambient
FXM1100 Max. O/P
-40°C
0°C
25°C
50°C
55°C
60°C
1031.25 W/VA
70°C
893.75 W/VA
74°C
838.75 W/VA
Page 53 of 76
TS008468
Infrastructure and Mobility, Traffic Solutions
FXM2000 Max. O/P
1100 W/VA
1100 W/VA
1100 W/VA
1100 W/VA
1100 W/VA
962.5 W/VA
Status
Date
Doc. No.
Sopers Lane, Poole, Dorset
2000 W/VA
2000 W/VA
2000 W/VA
2000 W/VA
1900 W/VA
1800 W/VA
1700 W/VA
1600 W/VA
1520 W/VA
ISSUED
31/01/2017
667/HB/47750/000
BH17 7ER
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