Non-regenerative front end vacon • 175
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11
11. NON-REGENERATIVE FRONT END
11.1 Introduction
The VACON
®
NX Non-regenerative Front End (NFE) is used to transfer power from the AC input to
the intermediate DC circuit to which the inverter units are connected.
The Non-regenerative Front End configurations consist of the unit itself, choke, pre-charging circuit,
control unit with accessories, AC fuses, circuit breaker and DC fuses which you need to take into
account when planning the switchgear configuration, see Figure 98. The construction is for 12-
pulse network but it can be used as 6-pulse.
Other accessories such as breakers, fuses and pre-charging components etc should be acquired
separately.
NOTE! If you use other chokes than the recommended ones, contact your nearest distributor to
ensure compatibility.
Scope of supply:
The NFE unit consists of the power module (-TB1), NXP control (-AA1) and its option boards, control
accessories and a choice of chokes (-RA1.1 and -RA1.2). The option board type is fixed A1A2BHB100.
The option board for fieldbus can be ordered separately and is assembled into the slot E.
These external control accessories need to be assembled separately:
• 2 pieces of input phase monitor relays (-PRM1.1 and -PRM1.2)
• DC-voltage transducer 1500Vdc-10Vdc (-KF10)
11.2 Diagrams
11.2.1 Non-regenerative Front End Unit wiring diagrams
The NFE unit has a typical control circuit. Some of the inputs and outputs can be set with
parameters for optional purposes. See the parameter list in Chapter 11.13.
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