English
1. OVERVIEW
G85139-H1751-U529-D1
© Siemens plc 1999
4/8/99
10
Figure 1.2.3: Wiring guidelines to minimise effects of EMI MICROMASTER Vector Frame Size C
On no account must safety regulations be compromised when installing inverters!
1.3 Electrical Installation - General Notes
1.3.1 Operation with Unearthed (IT) Supplies
MICROMASTER / MIDIMASTER Vector were developed for operation on grounded line supplies. These drive units can
also be operated on non-grounded line supplies. However, we do not recommend this. However, if the drive units are
operated on non-grounded line supplies, then the following points must be carefully observed:
·
It is mandatory that line reactors are used.
·
They are used to adapt line impedances and to minimize voltage peaks.
·
It is also mandatory to use output reactors.
·
The max. line supply voltage is 500V (the ±10% specified only refers to the range which is used to absorb voltage
peaks)
·
The drive unit is not shut down when ground faults occur on the incoming side.
·
The drive unit is shutdown with fault F002 (overcurrent) if one or several output conductors develop a ground fault.
·
Every drive unit has electronics which are grounded and which result in a ~ 20mA ground fault current.
·
The maximum clock cycle frequency is 2kHz.
·
Only non-filtered drive units may be used.
·
When operated at more than 40 Hz or briefly before full-load operation, the MIDIMASTER can be shut down with an
overcurrent message.
·
We recommend that ground fault monitoring devices are used at the incoming supply which can detect ground faults
at the drive converter output
If necessary, an insulating transformer should be used
MAINS POWER INPUT
FOOTPRINT FILTER
METAL BACK-PLATE
Fix motor and control cable screen
securely to metal back plate using
suitable clips.
