Licht MFC-300/P Technical Manual
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Licht MFC-300/P Technical Manual

Parallelism controller
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Parallelism Controller
model MFC-300/P
Technical Manual
Licht

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Summary of Contents for Licht MFC-300/P

  • Page 1 Parallelism Controller model MFC-300/P Technical Manual Licht...

  • Page 2: Table Of Contents

    MODBUS registers ........... . 20 Rev. A3 (29–05–12) MFC-300/P Technical Manual...

  • Page 3: Introduction

    Follower tap changers whose positions don’t match their Master’s. In the MFC-300/P architecture, each controller is responsible for a 3-phase transformer or a monophase transformer, and is interconnected with other MFC-300/P using a RS485 bus arrangement. MODBUS or DNP3 functionality is provided on a second dedicated RS485 port, which does not require additional hardware.

  • Page 4: Operating Principle

    Otherwise, transformers with lower outputs become loads to the others, creating circulation currents. The MFC-300/P is designed for power transformers with on-load tap changers. These can adjust their tranformation relation as their loads change, guaranteeing adequate reg- ulation.
  • 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-300/P will ignore subsequent commands and signal the error condition. In this scenario, the oper- ator must reconfigure the transformer as Individual and manually manage the system’s...

  • Page 6: Operation

    Transformer Transformer Position 7 Position 7 Position 4 Figure 3.2 Raise Command Example (Before) 3.3 Configuration The MFC-300/P features 4 keys to access its functions. The procedure to configure any parameter is as follows: Rev. A3 (29–05–12) MFC-300/P Technical Manual...

  • Page 7: Parameter Reset

    The configuration sequence can be cancelled at any time by pressing C. 3.4 Parameter reset The MFC-300/P can be reset to factory settings. This procedure also resets its password to AAAA. To do so, power on the device while pressing C.

  • Page 8: Programmable Parameters

    4 Programmable parameters The MFC-300/P was developed to provide the user with the greatest possible flexiblity, such that all supervision and configuration can be executed on-site or remotely through the existing communication channels. We define all user-configurable parameters as follows:...

  • Page 9: Modbus Protocol

    8E1: 8 data bits, even parity, 1 stop bit. 8O1: 8 data bits, odd parity, 1 stop bit. 8N2: 8 data bits, no parity, 2 stop bits. Parameter: Address Options: 1 to 247. Description: MODBUS address for the MFC-300/P. Rev. A3 (29–05–12) MFC-300/P Technical Manual...

  • Page 10: Dnp3 Protocol (Option)

    Options: 2 to 100 ms. Description: The DNP3 specification states that frames should not have inter-octet gaps. In accordance, the MFC-300/P never inserts inter-octet gaps when transmitting data. However, we allow the option to tolerate gaps in incoming transmissions. Frames featuring inter-octet gaps larger than the Maximum Inter-Octet Gap will be quietly dropped.
  • Page 11 Licht http://www.licht-labs.com info@licht-labs.com scheme is implemented. Before transmitting, the MFC-300/P always waits for the line to become idle. Once that happens, it waits for T ms, where T delay f ixed random f ixed is the fixed backoff delay and T...

  • Page 12: Error Conditions

    Contact problem. 5.3 Configuration error Configuration errors may occur in the following scenarios: Follower channels without a Master. Master channel with no Followers. More than one Master. Resistance per Position parameter is mismatched between devices. Rev. A3 (29–05–12) MFC-300/P Technical Manual...

  • Page 13: Communication Error

    5.4 Communication error Communication errors are characterized by serial (RS485) communication failures be- tween networked MFC-300/P controllers. Each MFC-300/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-300/P set to the same address.

  • Page 14: A Specifications

    8N1, 8E1, 8O1, 8N2 Displays 2 lines, 16 characters each (5 mm). LCD with backlight or VFD. Relays 10 A @ 250 Vac, 0.5 A @ 125 Vdc Galvanic Isolation: 2.0 kV, 60 Hz, 1 min. Rev. A3 (29–05–12) MFC-300/P Technical Manual...

  • Page 15: B Housing

    Licht http://www.licht-labs.com info@licht-labs.com B Housing Rev. A3 (29–05–12) MFC-300/P Technical Manual...
  • Page 16 Licht http://www.licht-labs.com info@licht-labs.com Rev. A3 (29–05–12) MFC-300/P Technical Manual...

  • Page 17: C Connection Diagrams

    Licht http://www.licht-labs.com info@licht-labs.com C Connection diagrams Rev. A3 (29–05–12) MFC-300/P Technical Manual...
  • Page 18 RS-485 pairs must be terminated at both ends by 120 Ω resistors. Rev. A3 (29–05–12) MFC-300/P Technical Manual...
  • Page 19 Licht http://www.licht-labs.com info@licht-labs.com 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 applicable) must free of potentials. Rev. A3 (29–05–12) MFC-300/P Technical Manual...

  • Page 20: D Configuration Sheet

    Relay 9 Configuration (See section 4) Output Current 0-1, 0-5, 0-10, 0-20, 4-20 mA MODBUS Address 1 to 247 MODBUS Format 8N1, 8E1, 8O1, 8N2 MODBUS Baud Rate 9600, 19200, 38400, 57600, 115200 bps Rev. A3 (29–05–12) MFC-300/P Technical Manual...

  • Page 21: Emodbus Registers

    A SCADA system can be connected to any of the networked MFC-300/P controllers. It may be connected to more than one MFC-300/P, or even to all of them if desired. Any MFC-300/P knows the states and parameters from all other MFC-300/P devices connected to it, and is designed to relay this information to a SCADA system.
  • Page 22 Configuration Error Timeout (user configurable), Communication Error Timeout (fixed at 10 seconds), Measurement Error Timeout (fixed at 10 seconds) and Synchronism Error Timeout (user configurable). Rev. A3 (29–05–12) MFC-300/P Technical Manual...
  • Page 23 Local delayed parallelism error Global instantaneous configuration error Global instantaneous communication error Global instantaneous measurement error Global instantaneous parallelism error Global delayed configuration error Global delayed communication error Global delayed measurement error Global delayed parallelism error Rev. A3 (29–05–12) MFC-300/P Technical Manual...
  • Page 24 Licht http://www.licht-labs.com info@licht-labs.com Rev. A3 (29–05–12) MFC-300/P Technical Manual...

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