5.8
Control transformer in the mains feed line
CAUTION!
Caution!
When using a control transformer in the frequency inverter
’
s mains supply line, you must connect a
capacitor parallel to the transformer
’
s primary winding (see Fig.).
The capacitor is used to prevent an extreme increase in voltage in case the voltage fails in one of the
phases to which the transformer is connected. This voltage increase can lead to destruction of the line
fi
lter. The cause of voltage increases is resonance of the control transformer with the radio-interfer-
ence suppression components, which are always used in frequency inverters.
ZETADYN 3C
X1
L1
L2
L3
L3
L2
L1
PE
1
400V
0V
230V
0V
Cx
2
3
Control transformer in the mains feed line
1
Mains 3~ 400V/PE/50Hz
2
Capacitor
3
Control transformer
Recommended capacitor types for Cx:
•
Epcos Typ B2583210
µ
F/640V-AV
•
Condensers for motor starting with following data: 10
µ
F/450V-AC
In addition, you must comply with the following:
•
During sequential disconnection, switch off the phase on which the transformer is operated last
•
Do not oversize the transformer
•
If a loaded and an intermittently unloaded transformer is operated in the open loop control, operate
these on the same phases
5.9
Motor connection (X2)
5.9.1
Cable cross section
The line cross-section must be speci
fi
ed dependent on the motor
´
s current and the ambient conditions
(e.g. temperature, wiring method) in accordance with DIN VDE 0298-4.
5.9.2
Type of cable
Always use shielded cables for the motor connections! Both rigid and
fl
exible lines can be installed.
The use of wire-end sleeves is recommended for
fl
exible lines.
5.9.3
Cable length
The maximum line length is 25 m. With a motor power line
> 25 m
compliance with DIN EN 12015
(electromagnetic compatibility
–
spurious emission and DIN EN 12016 (electromagnetic compatibility
–
interference immunity) can no longer be guaranteed.
Original operating instructions
ZETADYN 3C
Electrical installation
R-TBA08_03-GB 1619
Part.-No. 00163322-GB
25/204
Содержание ZETADYN 3BF
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