Ctl NX2700 Bedienungsanleitung PDF herunterladen (Seite 52)

LOW HARMONIC REGENERATIVE CABINET DRIVE vacon • 51

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Figure 7-4. Circuit diagram of remote contacts for the control of the

MCCB and pre-charging circuit (NXC regenerative low-harmonic FR12)

In case of a voltage drop of <0.7xU

or a blackout in the supplying network, the undervoltage release coil

will open the circuit-breaker and pre-charging and MCCB closing has to be activated by the remote

charging pulse when the supply is energized.

7.1.3 Automatic operation (AUTO)

The pre-charging and closing of the circuit-breaker is automatically done when the

REM-MAN-AUTO

selector switch is in

AUTO

position and the supply voltage is energized. The pre-charging of the units will

automatically (directly) start when the control switch -S6 is turned into

Auto

position. The AFE unit will

automatically close the circuit-breakers after DC voltage has reached a certain level and the AFE READY

LED will illuminate.

The unit will re-charge automatically and close the circuit-breakers if the main supply voltage has been

cut and turned back on (e.g. voltage drop in the network). The 0-1-Start switch has to be in position

which

enables automatic function.

Turning the switch –S10 to position

will open the circuit-breaker even if the

REM-MAN-AUTO

selector

switch is in

AUTO

position.

7.1.4 Circuit-Breaker TRIP due to overload or short-circuit

The electronic trip unit will open/trip the circuit-breaker in case of an overload or short circuit. The trip

indication contacts of circuit-breakers are connected in series and if one of the circuit-breakers trips due

to an overload or short circuit current, it will automatically open/trip the other circuit-breakers. The

MCCB

FAULT LED

will illuminate and indicate that the circuit breakers are in tripped state.

Figure 7-5. MCCB FAULT indicator

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Ctl NX2700 Bedienungsanleitung Seite 52