International English 2 Installation
MICROMASTER 440 Operating instructions
6SE6400-5CA00-0BP0
25
2.4 Electrical Installation
Warning
THIS EQUIPMENT MUST 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.
♦ 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.
♦ The inverters can be installed in a side-by-side configuration, but a distance
of 100 mm (3.94 inches) must be maintained if the inverters are installed on
top of each other.
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 G, H, I and J.
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).
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