Licht MFC-202/P Technical Manual Download Page 13 | Manualshive

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Licht MFC-202/P Technical Manual Download Page 13

Licht

http://www.licht-labs.com

[email protected]

Rev. A2 (30–05–12)

MFC-202/P Technical Manual

12

5.4 Communication error

Communication errors are characterized by serial (RS485) communication failures be-

tween networked MFC-202/P controllers. Each MFC-202/P is responsible for a given

transformer, and they must exchange position information to correctly operate. Possible

causes for communication errors are:

.

More than one MFC-202/P set to the same address.

.

Power failure in more than one MFC-202/P.

.

Connection failure between networked MFC-202/Ps.

.

EMI due to lack of shielding.

.

EMI due to failure to ground the cables’ shielding.

.

One or more defective MFC-202/P.

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Summary of Contents for MFC-202/P

Page 1: ...Parallelism Controller model MFC 202 P Technical Manual Licht...

Page 2: ...ds 5 3 3 Configuration 6 3 4 Parameter reset 6 4 Programmable parameters 7 4 1 MODBUS protocol 8 4 2 DNP3 protocol option 9 5 Error conditions 11 5 1 Synchronism error 11 5 2 Position deviation 11 5 3...

Page 3: ...nario we admit that all involved transformers have identical nominal currents number of taps and voltage delta per tap Each tap changer s position is read directly from its potentiometric sensor or in...

Page 4: ...oltage Circulation currents are minimized by operating transformers on identical positions In the Master Follower principle a transformer which we denote the Master is chosen as the reference The othe...

Page 5: ...This command may be local issued on the controller s keyboard or remote with digital dry contact inputs If a Follower transformer fails to respond to tap change commands the MFC 202 P will ignore subs...

Page 6: ...1 Addr 00 43 42 45 44 47 46 49 48 51 50 53 52 55 54 56 57 58 59 60 61 62 63 64 65 66 67 68 69 Figure 3 1 Front Panel In alarm situations the display alternates between an error message and the channel...

Page 7: ...s The procedure to configure any parameter is as follows 1 Press the P key to enter the parameters menu 2 Using the and keys choose the desired parameter 3 Press P to confirm the parameter s selection...

Page 8: ...changer s number of positions Resistance per Position Op es 3 to 20 Descri o Resistance in per tap changer position Synchronism Error Timeout Options 10 to 100 s Description Interval defined from the...

Page 9: ...C 202 P FC 4 FO 5 Position Deviation Any MFC 202 P FC 6 FO 7 Normal Operation Any MFC 202 P NC 8 NA 9 FC fail closed FO fail open NC normally closed NO normally open 4 1 MODBUS protocol Parameter Baud...

Page 10: ...or multi fragment responses Always Description Selects when the MFC 202 P outstation should request application layer confirmations Parameter Maximum Inter Octet Gap Options 2 to 100 ms Description Th...

Page 11: ...distributed between 0 and the random backoff delay parameter If after Tdelay ms the line is still idle then the MFC 202 P begins transmission Parameter Insert Inter frame Gap Options Never Always Des...

Page 12: ...correctly configured as Follower The position was manually altered at the tap changer and not through the paral lelism controller 5 2 Position deviation Position deviations are characterized by readin...

Page 13: ...P controllers Each MFC 202 P is responsible for a given transformer and they must exchange position information to correctly operate Possible causes for communication errors are More than one MFC 202...

Page 14: ...0 10 V Number of Positions 2 to 50 Potentiometric Disc Resistance 8 to 1000 Resistance per Tap 3 to 20 Dimensions L x H x D 160 x 105 x 75 mm Weight 1 0 kg DC Scales 0 1 0 5 0 10 0 20 4 20 mA Error N...

Page 15: ...Licht http www licht labs com info licht labs com Rev A2 30 05 12 MFC 202 P Technical Manual 14 B Housing...

Page 16: ...Licht http www licht labs com info licht labs com Rev A2 30 05 12 MFC 202 P Technical Manual 15 C Connection diagrams...

Page 17: ...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 electric...

Page 18: ...o licht labs com Rev A2 30 05 12 MFC 202 P Technical Manual 17 i RS 485 devices must be connected in a bus topology No other network topology tree star ring etc is acceptable j Dry contact inputs if a...

Page 19: ...Follower Individual Disabled Number of Positions 2 to 50 Resistance per Position 3 0 to 20 0 Synchronism Error Timeout 10 to 100 s Configuration Error Timeout 10 to 100 s Relay 7 Configuration See se...

Page 20: ...er in the chosen device The following pages list the MODBUS accessible parameters and their associated registers As an example suppose there are 5 interlinked MFC 202 P controllers with local bus addr...

Page 21: ...02 read only Transformer Expected Position 2 to 50 1 203 read only Parallelism mode 0 Master 1 Follower 2 Individual 3 Disabled 1 204 read only Errors See table below 1 Each bit from the error registe...

Page 22: ...lelism error 4 Local delayed configuration error 5 Local delayed communication error 6 Local delayed measurement error 7 Local delayed parallelism error 8 Global instantaneous configuration error 9 Gl...

Page 23: ...Licht http www licht labs com info licht labs com Rev A2 30 05 12 MFC 202 P Technical Manual 22...

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