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CONNECTION OF THE POWER UNIT

4.2.3 AC connection

4.2.3.1 AC supply 400V / 3-phase

PEPE

No. Type Description

①

Mains voltage 3-phase 400 V AC

Mains form

TN, TT IT

The rated voltage between one phase conductor and earth potential (or arti-

cialneutralpointintheITmains)mustnotexceed300V(effectivevalue).

Personal protection RCMA with separator or RCD type B Earth leakage monitor

②

Mains fuses Type gG or MCCB

③

Mains contactor

④

Mains choke =>

“Cable-fed disturbances depending on the motor line length at AC supply”

⑤

HFlter

Optional to observance the limit values according EN 61800-3 for units with-

outinternallter

⑥

KEB COMBIVERT S6

Figure 13: Connection of the mains supply

The service life of drive converters with voltage DC link depends on the DC voltage, sur-

rounding temperature and the current load of the electrolytic capacitors in the DC link. The

use of mains chokes can increase the service life of the capacitors to a considerable extent,

especially when connecting to „hard“ power systems or when under permanent drive load

(continuous duty). The term "hard" power system means that the nodal point power (Snet)

of the mains is very high (>> 200) compared to the rated apparent output power of the drive

converter (S

out).

k =

net

>> 200 e.g. k =

2 MVA (supply transformer)

= 500 ––> Choke required–––– –––––––––––––––––––––

out 4 kVA (10S6)

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