Derating Factors - Siemens SIMOTICS S-1FK7 DYA Generation 2 Operating Instructions Manual

Description of the motors

2.3 Derating factors

2.3 Derating factors
Under conditions other than those specified above (ambient temperature > 40° C or
installation altitude > 1000 m above sea level), the permissible torques/powers are shown in
the following table.
Ambient temperatures and installation altitudes are rounded off to 5° C or 500 m
respectively.
Table 2- 5
Installation altitude
above sea level in m
Factors x
The values required are provided in the M-n diagrams in the Configuration Manual for the
1FK7 G2.
Determine the reduced torque using the following formula:
M
red
x
×
D
You shift the S1 characteristic curve in parallel.
At installation altitudes of 2000 m above sea level or higher, the voltage stress on the motors
must be reduced accordingly based on the "Factors for reducing the maximum DC-link
voltage" table (reciprocal values from EN 60664-1 Table A. 2).
28
Power derating depending on the installation altitude and the ambient temperature (de-
rating factor x )
D
1000 1.05
1500 1.02
2000 1.00
2500 0.97
3000 0.95
3500 0.92
4000 0.89
refer to static torque M
D
M M M
= - ( - (
N 0 0
))
Ambient temperature in °C
30 35
1.02 1.00
1.00 0.97
0.97 0.95
0.95 0.92
0.92 0.89
0.89 0.87
0.87 0.84
.
0
M
/ Nm = reduced torque at rated speed
red
M
/ Nm = rated torque S1 (100K)
N
M
/ Nm = static torque (100K)
0
x
= derating factor
D
S-1FK7 DYA G2 synchronous motors with planetary gearbox
40 45
0.97
0.95
0.92
0.89
0.87
0.84
0.81
Operating Instructions, 05/2018, A5E44881183B AA
50 55
0.95 0.92
0.92 0.89
0.89 0.87
0.87 0.84
0.84 0.81
0.81 0.77
0.77 0.74