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Licht MFC-301/T-Dry Technical Manual

Version for dry transformers and motors
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Temperature Controller
model MFC-301/T-Dry
Version for Dry Transformers and Motors
Technical Manual
Licht

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Summary of Contents for Licht MFC-301/T-Dry

  • Page 1 Temperature Controller model MFC-301/T-Dry Version for Dry Transformers and Motors Technical Manual Licht...

  • Page 2: Table Of Contents

    Contents Introduction Operating principle General principle RTD operation Front panel indication Configuration Parameter reset Programmable parameters Current outputs (option) MODBUS protocol DNP3 protocol (option) Clock Specifications Housing diagrams Connection diagrams MODBUS registers Rev. A0 (30–05–12) MFC-301/T-Dry Technical Manual...

  • Page 3: Introduction

    1 Introduction The MFC-301/T-Dry is a precise, highly reliable and versatile microcontrolled protection system for dry transformers and motors. It is designed to read, infer, display and transmit the temperatures of up to 6 RTDs (resistance temperature detectors), and to activate alarm, cooling and shutdown systems whenever necessary.

  • Page 4: Operating Principle

    During normal operation, the temperature maximum for each RTD is registered in non- volatile memory. These values may be reset with a user command. The MFC-301/T-Dry can may also feature a current loop output with 16-bit resolution (maximum measured temperature among all the RTDs), and with scales configurable to 0-1, 0-5, 0-10, 0-20 or 4-20 mA.
  • Page 5 RTD. Once the originating fault is resolved (for example, by replacing a damaged RTD), the system returns to normal operation after a 30 second delay. Rev. A0 (30–05–12) MFC-301/T-Dry Technical Manual...

  • Page 6: Front Panel Indication

    In the Temperature display, the presented values are those measured by the RTDs, com- pensated for each sensor’s intrinsic nonlinearity and cable resistances. The Resistance option presents the physical RTD resistances read by the MFC-301/T-Dry in Ω, (without the cable resistances).

  • Page 7: Configuration

    4 Configuration The MFC-301/T-Dry features 4 keys to access its functions. The procedure to configure any parameter is as follows: 1. Press the P key to enter the parameters menu. 2. Enter the currently configured 4 letter password one letter at a time, using the keys to select each letter and P to advance between letters.

  • Page 8: Programmable Parameters

    5 Programmable parameters The MFC-301/T-Dry was developed to provide the user with the greatest possible flex- iblity, such that all supervision and configuration can be executed on-site through the keyboard or remotely via the RS-485 link. We define all user-configurable parameters as follows.

  • Page 9: Current Outputs (Option)

    Description: Full scale for the maximum of the RTD temperatures. For example, if = 150 C and Output Scale = 4-20 mA, the displayed temperature will be 0 C for 4.0 mA and 150 C for 20.0 mA. Rev. A0 (30–05–12) MFC-301/T-Dry Technical Manual...

  • Page 10: Modbus Protocol

    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-301/T-Dry. 5.3 DNP3 protocol (option) Parameter: Baud Rate Options: 9600, 19200, 38400, 57600, 115200 bps.

  • Page 11: Clock

    Options: 2 to 100 ms. Description: The DNP3 specification states that frames should not have inter-octet gaps. In accordance, the MFC-301/T-Dry 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 12: A Specifications

    8N1, 8E1, 8O1, 8N2 2 lines, 16 characters each (5 mm). Displays LCD with backlight or VFD. 10 A @ 250 Vac, 0.5 A @ 125 Vdc Relays Galvanic Isolation: 3.0 kV, 60 Hz, 1 min. Rev. A0 (30–05–12) MFC-301/T-Dry Technical Manual...

  • Page 13: B Housing Diagrams

    Licht http://www.licht-labs.com info@licht-labs.com B Housing diagrams Rev. A0 (30–05–12) MFC-301/T-Dry Technical Manual...

  • Page 14: C Connection Diagrams

    Licht http://www.licht-labs.com info@licht-labs.com C Connection diagrams Rev. A0 (30–05–12) MFC-301/T-Dry Technical Manual...

  • Page 15: Important Considerations

    RS-485 pairs must be terminated at both ends by 120 Ω resistors. Rev. A0 (30–05–12) MFC-301/T-Dry Technical Manual...
  • Page 16 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. A0 (30–05–12) MFC-301/T-Dry Technical Manual...

  • Page 17: Dmodbus Registers

    0 to 255 C Local Hour 0 to 23 Local Minute 0 to 59 Local Second 0 to 59 Local Day 1 to 31 Local Month 1 to 12 Local Year (2000-2099) 0 to 99 Rev. A0 (30–05–12) MFC-301/T-Dry Technical Manual...
  • Page 18 0.0 to 255.0 Ω bit 0: enabled bit 1: activated fan 521-526 RTD State[1-6] bit 2: activated alarm bit 3: activated trip bit 4: RTD failure 0.0 to 255.0 C 541-546 Maximum Temperature[1-6] Write to reset Rev. A0 (30–05–12) MFC-301/T-Dry Technical Manual...
  • Page 19 Licht http://www.licht-labs.com info@licht-labs.com Rev. A0 (30–05–12) MFC-301/T-Dry Technical Manual...

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