Engineering
09/01 AWB8230-1412GB
14
Connection to the mains
The DF5 series frequency inverters can be used without limitation
with every type of electrical grid (Electrical grids according to
IEC 364
-3).
Electrical grid types
Electrical grids with a direct earthing point (TT/TN
-systems):
• Operation of the frequency inverters of the DF5 series with TT
-/
TN
-systems is possible without limitation. Adhere to the rated
data of the DF5 series frequency inverters.
Grids with isolated centre point (IT
-systems):
• Operation of the frequency inverters of the DF5 series with
IT
-systems is only conditionally possible. A prerequisite is a
suitable device (isolation monitoring), which monitors earth
faults and isolates the frequency inverter from the mains.
Mains voltage, Mains frequency
The rated data for the frequency inverters of the DF5 take the
European and American standard voltages into account:
• 230 V, 50 Hz (EU) and 240 V, 60 Hz (USA) with DF5-322,
• 400 V, 50 Hz (EU) und 460 V, 60 Hz (USA) with the DF5-340
The permitted mains voltage range is:
• 230/240 V: 180 V – 0% to 252V+0%
• 400/460 V: 342 V – 0% to 506V+0%
The permissible frequency range is 47 Hz – 0% to 63Hz+0%.
The device assignment of the motor rating to the mains voltage is
listed in Section ”Technical Data”, Page 107 in the Appendix.
Internal voltages
Control 24 V DC, maximum 30 mA
Setpoint value definition
10 V DC, maximum 10 mA
Analog and digital actuation
Analog inputs • 1 input, 0 to 10 V, input impedance 10 kO
• 1 input, 4 to 20 mA, load impedance 250 O
Digital inputs/outputs
5 Freely programmable inputs
2 Outputs, open collector (maximum 27 V DC, 50 mA)
Monitor output
1 output for frequency or current, 10 V, maximum 1 mA
Keypad (integrated)
Operation 6 function keys for control and parameter definition of the DF5
Display
Four character 7 segment display and seven LEDs (status messages)
Potentiometer
Setpoint definition (0 to 270°)
1) If the frequency inverter is to be installed in a control panel, enclosure or similar installation, the prevalent ambient temperature within these enclo-
sures or control panels is considered to be the ambient temperature T
a
. The use of fans should be considered to ensure that the ambient temperature
remains within permissible limits.
h
If many frequency inverters with a single-phase supply are
connected to the mains, the symmetric distribution on all
three mains poles should be considered as well as the
loading of the common neutral pole (mains r.m.s current).
If necessary, the cross-section of the neutral pole must be
increased, if it conducts the total current of all single-
phase devices.
Caution!
With an earth fault in an IT
-system, the capacitors of the
frequency inverter which are switched to earth are subject
to a very high voltage. Therefore, safe operation of the
frequency inverter cannot be guaranteed. The situation
can be remedied with an additional isolating transformer
with an earthed centre point on its secondary, which is
then used to supply the input of the frequency inverter.
This constitutes an individual TN-system for the frequency
inverter.
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