74
Operating Instructions – Synchronous Compact Servomotors CMDV55 – CMDV162
8
Derating for increased ambient temperature
Technical Data of the CMDV Servomotors
8.8
Derating for increased ambient temperature
The following applies for determining a first approximation of a random thermal limit
curve in a temperature range of +40: The thermal limit curve for higher ambient temper-
atures must be reduced in all points (speed-related limit torque) by
∆
M
TH
:
8.9
Derating for high installation altitudes
No reduction in the thermal limit torque is required at installation altitudes up to 1000 m.
For operation at altitudes above 1000 m above sea level, consult SEW-EURODRIVE.
∆
M
TH
Thermal limit torque difference in Nm
M
TH
Thermal limit torque in Nm
T
A
Ambient temperature in °C
M
TH_re
Reduced thermal limit torque in Nm
1 –
∆
M
TH
=
M
TH
x
Example CMDV 93L with n
N
= 3000 rpm:
T
U
= 60 °C
M
TH
= 5 Nm
Nm
M
TH_re
=
M
TH
–
∆
M
TH
n = 3000 min
–1
145 – T
U
105
∆
M
TH
= 5 x
1 –
145 – 60
105
∆
M
TH
= 0.5 Nm
M
TH_re
=
5.0 Nm – 0.5 Nm = 4.5 Nm
(
)
(
)
P
i
f
kVA
Hz
n
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