Hardware Manual

154 Technical data
Derating
 Ambient temperature derating
IP21 (UL Type 1) drive types and other IP55 (UL Type 12) types than listed in the
following subheadings
In the temperature range +40…55 °C (+104…131 °F), the rated output current is
derated by 1% for every added 1 °C (1.8 °F). The output current can be calculated by
multiplying the current given in the rating table by the derating factor (k):
IP55 (UL Type 12) drive types -274A-2, 293A-3, -260A-5, -302A-5 and -174A-7
In the temperature range +40…45 °C (+104…113 °F), the rated output current is
derated by 1% for every added 1 °C (1.8 °F). In the temperature range +45…55 °C
(+113…131 °F), the rated output current is derated by 2.5% for every added 1 °C
(1.8 °F). The output current can be calculated by multiplying the current given in the
rating table by the derating factor (k):
T
1.00
0.90
+40 °C
+104 °F
+50 °C
+122 °F
k
+55 °C
+131 °F
0.80
-15 °C
+5°F
…
0.85
0.95
T
1.00
0.90
+40 °C
+104 °F
+50 °C
+122 °F
k
+55 °C
+131 °F
0.80
+45 °C
+113 °F
0.70
0.75
0.85
0.95
-15 °C
+5 °F
…