e3
0b
u7
93
.1
0
Illustration 56: Removing the Cradle Cover
All the drive control terminals are shown in
. 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).
e30bf892.10
12 20 55
18 19 27 29 42
54
45 50 53
DIGI IN
61 68 69
N
P
COMM. GND
+24 V
GND
GND
10 V
OUT
10
V/20 mA IN
0/4-20 mA A OUT/DIG OUT
BUS TER.
OFF
ON
DIGI IN
DIGI IN
DIGI IN
0/4-20 mA A OUT/DIG OUT
10
V/20 mA IN
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
M,N
. This
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
VLT
) at different loads based on the following illustration. Multiply the factor in the following
illustration by the specific efficiency factor listed in the specification tables.
AJ363928382091en-000101 / 130R0983
76 | Danfoss A/S © 2021.04
Electrical Installation
Considerations
VLT® Flow Drive FC 111
Design Guide