Siemens 6RA7086-6KS22 Operating Instructions Manual page 53

05.05
1) The armature/field supply voltage can be lower than the rated armature/field voltage (setting in
parameter P078, input voltages down to 85V are permissible for converters with rated supply
voltage of 400V). The output voltage is reduced accordingly.
The specified output DC voltage can be guaranteed up to an undervoltage corresponding to
95% of line voltage (rated supply voltage armature/field).
2) Values apply to output rated DC current.
3) Load factor K1 (direct current) as a function of coolant temperature (see P077 Section 11).
K1 > 1 permitted only if K1 * K2 ≤ 1.
Total derating factor K = K1 * K2 (K2 see below)
Ambient
temperature or
coolant
temperature
≤ + 30ºC
+ 35ºC
+ 40ºC
+ 45ºC
+ 50ºC
+ 55ºC
+ 60ºC
a) In spite of derating, converters of ≥400 A with forced air cooling may be operated at an
ambient or coolant temperature of 50°C only if the rated supply voltage of the converter fan
is safely within the limited tolerance range of 400V + 10% –15%.
b) Not permissible when T400 or OP1S is used.
4) Load values as a function of installation altitude (refer to P077 in Section 11)
Total derating factor K = K1 * K2 (K1 see above)
100
Percentage
load "b"
Curve b1: Reduction factor of load values (DC current) at installation altitudes above 1000 m
Siemens AG 6RX1700-0AD76
SIMOREG DC Master Operating Instructions
in devices with self-cooling in devices with enhanced
1.18
1.12
1.06
1.00
0.94
0.88
0.82
b1
%
80
60
40
20
0
1000 2000
Load factor K1
air cooling
1.10
1.05
1.00
0.95
0.90
b)
3000 4000 5000 m
Installation altitude
a)
Installation
altitude
[m]
1000
67%
2000 0.835
3000 0.74
4000 0.71
5000 0.67
Description
Derating
factor K2
1.0
3-31