Details introduction

NYQUIST IOB-80 module card

There are two possible configurations for two Node numbers of the field exciters: - one SDCS-FEX-2 and one external field exciter (DCF503A-0050, DCF504A-0050 or 3-phase field exciter) or - two external field exciter units (DCF503A-0050, DCF504A-0050 or 3-phase field exciter).If a SDCS-FEX-2 is used, it will be always recognized as the field exciter Node 1 by the software. If a DCF503A/504A-0050 is used as Node 1 or Node 2 it must be coded according to the table below. Node 2 is operating with a cycle time of 100 ms.Procedure for code changing of the DCF 503A/504A: • Switch off the units voltage supply • Set the appropriate switch according to the table • Initialization through switch on the electronics supply voltage As standards, specifications, and designs change from time to time, information contained in this guide may be subject to change without notice. To the extent permitted by applicable law, no responsibility or liability is assumed by Schneider Electric and its subsidiaries for any errors or omissions in the informational content of this material or consequences arising out of or resulting from the use of the information contained herein.

DCF505 / DCF506 Overvoltage Protection

The three-phase field supply converter DCF 501/502 and DCF 601/602 need a separate active Overvoltage Protection unit DCF 505 and DCF 506 for protection the power part against inadmissibly high voltages. The protection unit operates by switch on a freewheeling circuit between the F+ and F- connectors if a overvoltage occurs. The DCF 505/506 consists of a trigger unit and a free-wheeling thyristor (two in antiparallel at DCF 506). Thyristor firing is caused by a 1400 V (FEP1 - 500 V) and 1800 V (FEP2 - 690 V) trigger diode. The DCF 506 consist of a relay output for signalling the field supply converter that the overvoltage protection is active. The output is active in the free-wheeling process until the current is less than appr. 0.5 A Line chokes for use in light industrial/residential environment, high inductive voltage drop, reduced commutation notches. These chokes are designed for drives which usual operate in speed control mode. The maximum average DC load current depends on the operation point. DC curr. 1 = maximum continuous current for Urated supply = 400 V DC curr. 2 = maximum continuous current for Urated supply = 500 V

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