3.7.2 Power Loss Data and Efficiency Data
The power loss and the efficiency of a frequency converter
depend on configuration and auxiliary equipment. To get a
configuration-specific power loss and efficiency data, use
the Danfoss VLT
®
ecoSmart application.
The power loss data are provided in % of rated apparent
output power, and are determined according to EN
50598-2. When the power loss data are determined, the
frequency converter uses the factory settings except for
the motor data which is required to run the motor.
T
f
100%
50%
50%
90%
25%
0%
0%
130BE605.10
T
Torque [%]
f
Frequency [%]
Illustration 3.15 Frequency Converter Operating Points
According to EN 50598-2
Refer to
www.danfoss.com/vltenergyefficiency
for the power
loss and efficiency data of the frequency converter at the
operating points specified in
Use the VLT
®
ecoSmart application to calculate IE and IES
efficiency classes. The application is available at
.
Example of available data
The following example shows power loss and efficiency
data for a frequency converter with the following charac-
teristics:
•
Power rating 55 kW, rated voltage at 400 V.
•
Rated apparent power, Sr, 67.8 kVA.
•
Rated output power, P
CDM
, 59.2 kW.
•
Rated efficiency, η
r
, 98.3%.
and
show the power loss
and efficiency curves. The speed is proportional to the
frequency.
130BD930.11
1.80
1.60
1.40
1.20
1.00
0.80
0.60
0.40
0.20
0.00
0 10
20 30 40 50 60 70 80 90 100
n [%]
P
L,CDM
(fr
eq
,load)
[%]
1
2
3
1
100% load
2
50% load
3
25% load
Illustration 3.16 Frequency converter power loss data.
CDM relative losses (P
L, CDM
) [%] versus speed
(n) [% of nominal speed].
130BD931.11
n [%]
0 20 40 60 80 100
100.00
98.00
96.00
94.00
92.00
90.00
η
CDM (fr
eq
,load)
[%]
1
2
3
1
100% load
2
50% load
3
25% load
Illustration 3.17 Frequency converter efficiency data.
CDM efficiency (η
CDM(freq, load)
) [%] versus speed
(n) [% of nominal speed].
Interpolation of power loss
Determine the power loss at an arbitrary operating point
using 2-dimensional interpolation.
3.7.3 Losses and Efficiency of a Motor
The efficiency of a motor running at 50–100% of the
nominal motor speed and at 75–100% of the nominal
torque is practically constant. This is valid both when the
frequency converter controls the motor, or when the motor
runs directly on mains.
The efficiency depends on the type of motor and the level
of magnetization.
For more information about motor types, refer to the
motor technology brochure at
.
System Integration
Design Guide
MG03M202
Danfoss A/S © 06/2016 All rights reserved.
45
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