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6.6.6 Functional description

The pre-charging contactor (K2) is switched by applying a 24 V DC voltage to the cou-

pling relay (K1). If the DC link voltage reaches an adjustable value (480 V DC at factory

setting LE.04) output O1 is set and the coupling relay switches (K5). K5 disconnects the

pre-charging contactor K2 and switches the main contactor K3. Further charging of the

DClinkisdoneviathemaincontactorandAICorLCLlter.

The modulation is suppressed via internal programming (OA, IA) as long as an adjust-

able threshold value (LE.04) is reached and a responding waiting period (di.48) has

expired.

The control release is set by switch (S1), if the pre-charging contactor K2 drops out and

the main contactor has tightened. A delay time (di.42) starts simultaneously with the

control release by input I2 after that the modulation is released.

Phase position and phase sequence (counterclockwise/clockwise) of the mains voltage

are detected now. Thereafter, the DC link voltage is controlled to the preset setpoint

(oP.03). If this value is reached, the relay output 2 (R2) switches after one second. The

drive converter can modulate if the external control release of the drive converter (S4)

is set.

Flow chart switch-on procedure

Modulation (AIC)

O1 (AIC)

R2 (AIC)

OA->IA (AIC)

LE.00/04

565V

oP.03 (680V)

5s (di.48)

5s (di.42)

Udc

Figure 13: Flow chart switch-on procedure

CONNECTION OF THE COMBIVERT F5-AIC

KEB COMBIVERT 24F5 Series User Manual

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