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Summary of Contents for TILLQUIST LQT40M
- Page 1 USER MANUAL LQT40M TILLQUIST GROUP AB Box 1120 SE-164 22 Kista Sweden Tel: +46 8 594 632 00 info@tillquist.com www.tillquist.com Rev. 0.2 2023-12-28...
- Page 2 The LQT40M is a programmable multi transducer for power systems. All electrical quantities for AC current and voltage (True RMS) are covered by one single unit. It can measure single phase systems up to 4-wire unbalanced load systems. Serial communication with Modbus TCP.
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Page 3: Table Of Contents
Table of contents Instructions ..........................1 1.1 Purpose of this document......................1 1.2 Intended use ..........................1 1.3 Mounting ............................1 1.4 Installation and maintenance......................1 1.4.1 Safety notes ..........................1 1.5 Operation ............................1 1.6 Safety ............................2 1.7 Warning! .............................2 1.8 Maintenance ..........................2 1.9 Symbols ............................2 1.10 FCC Part 15 information ......................2 1.11 Disclaimer of liability ........................3 Connections ..........................4... -
Page 4: Instructions
1 Instructions 1.1 Purpose of this document This document describes how to use the LQT40M multi transducer. The user manual is intended to be used by: • installation personnel and commissioning engineers • service and maintenance personnel • planners 1.2 Intended use The transducer is intended to measure electrical quantities, 1 to 3-phases (alternating voltage and currents). -
Page 5: Safety
1.6 Safety All inputs and outputs are galvanically isolated from each other. Protection class: II, protective insulation, voltage inputs via protective impedance. Communication Only connect the communication interfaces of the device interfaces: to circuits with extra-low voltage (max. 30VAC, 42.4V peak, 60VDC). -
Page 6: Disclaimer Of Liability
This is especially true for different language versions of this document. This document is regularly reviewed and updated. Necessary corrections will be included in subsequent version and are available via our webpage http://www.tillquist.com. -
Page 7: Connections
2 Connections 2.1 Connection diagram Voltage input Current input Aux Power Supply... -
Page 8: Electric Connection
Wire stripping: max 9 mm Recommended torque: 0.8 - 0.88 Nm / 7.2 - 7.9 in.lbs 2.3 Connection diagrams – System connection LQT40M system connection is programmable from single phase to 4-wire balanced or unbalanced connection. Configurable System Connection System Application... - Page 9 1-phase 4-wire 1 element 3-phase symmetric load 1-phase 2-wire 1 element Single-phase AC 1-phase 3-wire 1 element 3-phase symmetric load phase-shift U12-I1 1-phase 3-wire 1 element 3-phase symmetric load phase-shift U23-I1 1-phase 3-wire 1 element 3-phase symmetric load phase-shift U31-I1...
- Page 10 3-phase 3-wire 1 element 3-phase symmetrical load 3-phase 3-wire 2 elements 3-phase asymmetrical load 3-phase 4-wire 3 elements 3-phase asymmetrical load...
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Page 11: Measuring
3 Measuring 3.1 Measured quantities Prefix Quantity Calculation System / Phase Input current (I1+I2+I3)/3 System Phase current L1 Phase current L2 Phase current L3 Input voltage (U1+U2+U3)/3 System L1 Phase voltage L2 Phase voltage L3 Phase voltage Active power P1+P2+P3 System Active power L1 Active power L2... -
Page 12: Meassuring System
3.2 Meassuring system 3.2.1 Phase-Locked loop - PLL The measuring system use a phase-locked loop (PLL) between 10-120 Hz. All quantities are being measured. The number of samples per period is deppending of the frequency. 3.2.2 Soft mode A fixed sample rate of 1800 samples/second (soft mode) is used when the frequency is lower than 10 Hz or higher than 120 Hz. -
Page 13: Output - Modbus Tcp
4 Output – Modbus TCP LQT40M has a Modbus TCP output for serial communication. Three different set of ”Process Data Set Mapping”” are availble. 4.1 Ethernet configuration Ethernet parameters are set in ConfigLQT v3. 4.2 Process Data Set Mapping A: Basic... - Page 14 C: Extended Data Parameters Parameter Range Bus value Type Byte Note Bus Inc Num 0-65535 Unsigned Word Data Inc Num 0-65535 Unsigned Word I_RMS 0-12 0-12000 Unsigned Double Word (I1+I2+I3)/3 U_RMS 0-300 0-300000 Unsigned Double Word 9-12 (U1+U2+U3)/3 P_RMS ±10800 ±10800000 Signed Double Word 13-16 P=P1+P2+P3...
- Page 15 D: Full map format parameter explanation 0 binary32 Frequency system 2 binary32 Input current system I = (I1+I2+I3)/3 4 binary32 Phase current 6 binary32 Phase current 8 binary32 Phase current 10 binary32 Input voltage system U = (U1+U2+U3)/3 12 binary32 Phase voltage L1-N 14 binary32...
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Page 16: Ethernet Settings For Modbus Tcp
secondary transformer ratio of parameter CTR, PTR. The CTR and PTR parameter can be configured by the user by editing primary to secondary current- and voltage-ratio in ConfigLQT. 4.3 Ethernet settings for Modbus TCP Ethernet parameters are set in ConfigLQT v3. -
Page 17: Commissioning
5 Commissioning 5.1 Programming of the transducer ”ConfigLQT” is a free configuration software, it is availible for download from Tillquist homepage, www.tillquist.com. The software connects to the transducer and make it possible to change the configuration of adjustable parameters and to visualize live readings. -
Page 18: Technical Data
6 Technical Data Technical Data Details Input Voltage range (Un) 100 – 400 V (L-L) main voltage (nominal) 1 – 520 V TRMS 50/60 Hz or 16⅔ Hz CAT III Measuring range 1 - 300 V TRMS 50/60 Hz or 16⅔ Hz CAT III 50/60 Hz (10…40….70…120 Hz) Frequency ⅔... -
Page 19: Ordering Codes
Customer configuration (to provide ERF) High precision with Frequency Test Certificate LQT40M-20000 LQT40M Modbus TCP 50/60 Hz LQT40M-20001 LQT40M Modbus TCP 50/60 Hz with ERF and Test Protocol LQT40M-21000 LQT40M Modbus TCP 16⅔ Hz LQT40M-20201 LQT40M Modbus TCP 50 Hz with Frequency Test Protocol...
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