Danfoss VLT Flow Drive FC 111 Design Manual page 76

VLT® Flow Drive FC 111
Electrical Installation
Design Guide
Considerations
Illustration 56: Removing the Cradle Cover
All the drive control terminals are shown in Illustration 57. Applying start (terminal 18), connection between terminals 12-27, and an
analog reference (terminal 53 or 54, and 55) make the drive run.
The digital input mode of terminal 18, 19, and 27 is set in parameter 5-00 Digital Input Mode (PNP is default value). Digital input 29
mode is set in parameter 5-03 Digital Input 29 Mode (PNP is default value).
BUS TER.
OFF ON
61 68 69
18 19 27 29 42 45 50 53 54
12 20 55
Illustration 57: Control Terminals
6.11 Efficiency
6.11.1 Efficiency of the Drive
The load on the drive has little effect on its efficiency. In general, the efficiency is the same at the rated motor frequency f . This
M,N
rule also applies even if the motor supplies 100% of the rated shaft torque or only 75%, for example if there is part loads.
This also means that the efficiency of the drive does not change even if other U/f characteristics are selected.
However, the U/f characteristics influence the efficiency of the motor.
The efficiency declines a little when the switching frequency is set to a value above the default value. If the mains voltage is 480 V,
or if the motor cable is longer than 30 m (98.4 ft), the efficiency is also slightly reduced.
Calculate the efficiency of the drive (η ) at different loads based on the following illustration. Multiply the factor in the following
VLT
illustration by the specific efficiency factor listed in the specification tables.
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