Electrical Installation - Siemens MICROMASTER 420 Operating Instructions Manual

Issue 04/02
2.4

Electrical installation

WARNING
The inverter must always be grounded.
♦
To ensure the safe operation of the equipment, it must be installed and
commissioned by qualified personnel in full compliance with the warnings laid
down in these operating instructions.
♦
Take particular note of the general and regional installation and safety
regulations regarding work on dangerous voltage installations (e.g. EN
50178), as well as the relevant regulations regarding the correct use of tools
and personal protective gear.
♦
Never use high voltage insulation test equipment on cables connected to the
inverter.
♦
The mains input, DC and motor terminals, can carry dangerous voltages even
if the inverter is inoperative; wait 5 minutes to allow the unit to discharge after
switching off before carrying out any installation work.
CAUTION
The control, power supply and motor leads must be laid separately. Do not feed
them through the same cable conduit/trunking.
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 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.
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 0 and 0.
Operation with Residual Current Device
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 300mA.
The neutral of the supply is grounded.
Only one inverter is supplied from each RCD.
The output cables are less than 50m (screened) or 100m (unscreened).
Operation with long cables
All inverters will operate at full specification with cable lengths up to 50 m screened
or 100 m unscreened.
MICROMASTER 420 Operating Instructions
6SE6400-5AA00-0BP0
2 Installation
25