Siemens Micromaster 440 Operating Instructions Manual page 32

2 Installation
2.4.1 General
WARNING
The inverter must always be grounded. If the inverter is not grounded correctly,
extremely dangerous conditions may arise within the inverter which could prove
potentially fatal.
Operation with ungrounded (IT) supplies
The use of filtered MICROMASTER 4 drives on unearthed mains supplies is not
permitted.
On ungrounded supplies, it will be necessary to remove the 'Y' capacitor from the
inside of the unit and fit an output choke. The procedure for removing this capacitor
is described in Appendices D.
The MICROMASTER will operate from ungrounded supplies and will continue to
operate if an input phase is shorted to ground. If an output phase is shorted to
ground, the MICROMASTER will trip and indicate F0001.
Operation with Residual Current Device (Frame Sizes A to F)
If an RCD (also referred to as ELCB or RCCB) is fitted, the MICROMASTER
inverters will operate without nuisance tripping, provided that:
! A type B RCD is used.
! The trip limit of the RCD is 300 mA.
! The neutral of the supply is grounded.
! Only one inverter is supplied from each RCD.
! The output cables are less than 50 m (screened) or 100 m (unscreened).
Operation with long cables
All inverters will operate at full specification with cable lengths as follows:
Frame Sizes A to F
! screened:
! unscreened:
Frame Sizes FX and GX
! screened:
! unscreened:
Using the output chokes specified in catalogue DA 51.2, the following cable lengths
are possible for all frame sizes:
! screened:
! unscreened:
32
50 m
100 m
100 m
150 m
200 m
300 m
MICROMASTER 440 Operating Instructions
6SE6400-5AW00-0BP0
Issue 12/02