Answer Drives GT3000, Hardware & Software Manual

Page: 117 / 128

Installation GT3000
IMGT30017EN 105
A2.2.1 RFI FILTER (codes: see Table A2.5)
RFI filter in an earthed line (TN or TT) Network:
The filters are suitable for earthed lines only, for example in public European 400 V lines.
According to EN 61800-3, filters are not compatible in insulated industrial lines with
own supply transformers due to their safety risks in such floating lines (IT networks).
Where RFI (electromagnetic compatibility) is a concern, and the network is
symmetrically grounded, RFI filter may be installed. For reference,
the diagram at right illustrates a symmetrically grounded network.
Earth fault detection:
Filters (with internal discharging resistors), cables, the converter and the motor have together a considerable capacitance to ground, which can cause
an increased leakage earth current (>30mA).
The tripping threshold of an earth fault detector that measures this current must be adapted to this higher value.
Floating Networks IT (ungrounded) systems:
For floating networks (known as IT, ungrounded or impedance/resistance grounded networks), if the drive is equipped with EMC filter:
• Disconnect the filter before connecting the drive to an ungrounded system.
• Where EMC requirements exist, check for excessive emission propagated to neighbouring low voltage networks. In some cases, the natural
suppression in transformers and cables is sufficient. If in doubt, use a supply transformer with static screening between the primary and secondary
windings.
Note: For SVGT0P3/0P4/0P6 the filter is
supplied loose with a kit that includes an adaptor
for mounting the RFI filter below the drive.
Kit SAP code:
1000007130.
NOTE: Refer to Figure A2.2 for filter connection to the drive.
The filter shall be grounded before applying power and can be used with balanced supply mains only.
Do not attempt to install or remove RFI filter connections while power is applied to the drive’s input
terminals
If a drive with EMC filter is installed on an IT system [an ungrounded power system or a high resistance-
grounded (>30
Ω
) power system], the system will be connected to earth potential through the EMC filter
capacitors of the drive. This may cause danger or damage the unit.
The filter shall not be connected to the drive output (motor side).
CAUTION!
Enter
SHIFT
C anc.
REM OTE CONTROL OP ERATOR
ON
MAN ST OP
Fau lt
A UT O
RUN
R ESET