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Rev. A1 (20–05–09) MFC-400/I-IAC and I-IDC Technical Manual

1 Introduction

The MFC-400/I-IAC and MFC-400/I-IDC are precise, highly reliable and versatile mi-

crocontrolled devices designed to read, display and retransmit AC or DC current values.

They feature one isolated RS-485 port, which can be used for communication using the

MODBUS or DNP3 protocols.

Signals that enter and exit the indicator are galvanically isolated, preventing potentially

damaging noise and transients from being transferred between subcircuits or retransmitted

to other devices.

Figure 1.1

MFC-400/I-IAC and MFC-400/I-IDC Indicators

Summary of Contents for MFC-400/I-IAC

Page 1: ...Current Indicator Transducer model MFC 400 I IAC and I IDC Technical Manual Licht...

Page 2: ...n 2 2 Front panel indication 3 3 Configuration 4 3 1 Parameter reset 4 4 Programmable parameters 5 4 1 General parameters 5 4 2 Current outputs option 5 4 3 MODBUS protocol 5 4 4 DNP3 protocol option...

Page 3: ...designed to read display and retransmit AC or DC current values They feature one isolated RS 485 port which can be used for communication using the MODBUS or DNP3 protocols Signals that enter and exi...

Page 4: ...presented value is equal to the measured current multiplied by the Sampling Factor parameter If more than 2 inputs are used a timer automatically changes the channels on display The user may manually...

Page 5: ...ng the and keys to select each letter and P to advance between letters The default password is AAAA 3 Using the and keys choose the desired parameter 4 Press P to confirm the parameter s selection 5 C...

Page 6: ...MFC 400 I IAC or MFC 400 I IDC and the sampled current Parameter AC frequency Options 60 Hz 50 Hz Description input current frequency only applicable to the MFC 400 I IAC 4 2 Current outputs option P...

Page 7: ...te Options 9600 19200 38400 57600 115200 bps Description baud rate for the RS 485 link Parameter Format Options 8N1 8E1 8O1 8N2 Description symbol transmission format where 8N1 8 data bits no parity 1...

Page 8: ...sion avoidance a backoff scheme is implemented Before transmitting the MFC 400 always waits for the line to become idle Once that happens it waits for Tdelay Tfixed Trandom ms where Tfixed is the fixe...

Page 9: ...t 500 g DC Input Scale specifiable Error Non linearity 0 2 0 1 10 C AC Input Scale specifiable Error Non linearity 0 5 0 1 10 C Current Output Scales 0 1 0 5 0 10 0 20 4 20 mA Error Non linearity 0 2...

Page 10: ...Licht http www licht labs com info licht labs com Rev A1 20 05 09 MFC 400 I IAC and I IDC Technical Manual 9 B Connection diagrams...

Page 11: ...Licht http www licht labs com info licht labs com Rev A1 20 05 09 MFC 400 I IAC and I IDC Technical Manual 10...

Page 12: ...ays and conduits must be preserved up to frequencies in the order of MHz over all their extension including curves and junctions In order to guarantee this continuity joints and bonds should present e...

Page 13: ...labs com Rev A1 20 05 09 MFC 400 I IAC and I IDC Technical Manual 12 i RS 485 devices must be connected in a bus topology No other network topology tree star ring etc is acceptable j Dry contact inpu...

Page 14: ...ccessible registers considering a device with 6 input channels Not all registers may be accessible in some devices given that not all channels or relays may be installed For example a device with 4 ch...

Page 15: ...Licht http www licht labs com info licht labs com Rev A1 20 05 09 MFC 400 I IAC and I IDC Technical Manual 14...