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Description of the motors
2.3 Derating factors
S-1FK7 DYA G2 synchronous motors with planetary gearbox
28
Operating Instructions, 05/2018, A5E44881183B AA
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
Power derating depending on the installation altitude and the ambient temperature (de-
rating factor x
D
)
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 x
D
refer to static torque M
0
.
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
=
M
N
- (
M
0
- (
M
0
×
x
D
))
M
red
/ Nm = reduced torque at rated speed
M
N
/ Nm = rated torque S1 (100K)
M
0
/ Nm = static torque (100K)
x
D
= 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).