10/05 AWB8230-1541GB
Motor and circuit type
21
• Reduce electromagnetic emission interference by screening
motor cables and signal cables.
• Ensure compliance with installation guidelines (EMC-compliant
installation).
EMC interference class
With frequency inverters, performance-related and emitted
interference increase with the switching frequency. The frequency
at which performance-related interference occurs also increases
with longer motor cables. When the respective radio interference
filter is used, the IEC/EN 61800-3 standard is complied to as
follows:
• Limit values for emitted interference corresponding to first
environment, interference immunity according to second
environment (restricted and unrestricted putting into
circulation) = universal use in both environments.
• Maximum cable length in the first environment is 10/20 m.
• The maximum cable length in the second environment is 50 m
at 5 kHz operating frequency. Observe installation instructions
(a section “EMC measures in the control panel”, page 30).
• Single-phase frequency inverters can not be operated on the
public mains with I
N
< 16 A. (They exceed the maximum
harmonics values in IEC/EN 61000-3-2, even with chokes
fitted). The values can be maintained only with an inverter on
the mains side.
For further information, see paragraph “EMC compliance”,
page 29.
Motor and circuit type
The stator winding of the motor can be connected as a star or delta
configuration in accordance with the rating data on the
nameplate.
Table 2: Assignment of frequency inverters to example motor circuit (Fig.11)
Connecting motors in parallel
The DF51 frequency inverters allow parallel operation of several
motors in U/f control mode:
• U/f control: several motors with the same or different ratings.
The sum of all motor currents must be less than the frequency
inverter’s rated current.
• U/f control: parallel control of several motors. The sum of the
motor currents plus the motors’ inrush current must be less than
the frequency inverter’s rated current.
Parallel operation at different motor speeds can be implemented
only by changing the number of pole pairs and/or changing the
motor’s transmission ratio.
Figure 11: Example of a motor nameplate
Figure 12: Connection types
/ 400 V230
3.5 / 2
0,75S1
0.79
ϕ
cos
kW
rpm
1430 50 Hz
A
U1 V1 W1
W2 U2 V2
U1 V1 W1
W2 U2 V2
Frequency Inverters DF51-322-075 DF51-322-075 DF51-340-075 DF51-340-1K5
Mains voltage 3 AC 230 V 1 AC 230 V 3 AC 400 V 3 AC 400 V
Mains current
5.2 A 9 A 3.3 A 5 A
Motor circuit Delta Delta Star Delta
Motor current
3.5 A 3.5 A 2 A 3.5 A
Motor voltage 3 AC 0 to 230 V 3 AC 0 to 230 V 3 AC 0 to 400 V 3 AC 0 to 230 V
Motor speed
1430 r.p.m. 1430 r.p.m. 1430 r.p.m. 2474 r.p.m.
–1 1)
Motor frequency 50 Hz 50 Hz 50 Hz 87 Hz
1)
1) Observe the motor’s limit values!
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