Siemens SIMOTICS S-1FK7 - Derating Factors

Description of the motors
2.3 Derating factors
1FK7 G2 synchronous motors
Operating Instructions, 05/2021, A5E50907562B AA
27
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- 4 Power de-rating depending on the installation altitude and the ambient temperature
Installation altitude
above sea level in m
Ambient temperature in °C
30
35
40
45
50
55
1000
1.05
1.02
1.00
0.97
0.95
0.92
1500
1.02
1.00
0.97
0.95
0.92
0.89
2000
1.00
0.97
0.95
0.92
0.89
0.87
2500
0.97
0.95
0.92
0.89
0.87
0.84
3000
0.95
0.92
0.89
0.87
0.84
0.81
3500
0.92
0.89
0.87
0.84
0.81
0.77
4000
0.89
0.87
0.84
0.81
0.77
0.74
Factors xD refer to static torque M0.
Determine the reduced torque using the following formula:
M
red
= M
N
- (M
0
- (M
0
•
xD))
Mred / Nm = reduced torque at rated speed
MN / Nm = rated torque S1 (100K)
M0 / Nm = static torque (100K)
xD = derating factor
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).
Table 2- 5 Factors for reducing the maximum DC-link voltage
Installation altitude up to [m] above mean sea
level
Factor
2000
1
3000
0.877
4000
0.775
5000
0.656
6000
0.588
7000
0.513
8000
0.444
As the DC-link voltage is reduced, the converter output voltage also decreases. This reduces
the operating range in the M-n diagram.
The M-n diagrams are contained in the associated Configuration Manual.
Operation in a vacuum is not permissible because of the low dielectric strength and poor heat
dissipation.