TrustedTM PD-T8834 TrustedTM 20 Channel Isolated AI/DI FTA External Power Introduction TM The Trusted 20 Channel Isolated AI/DI FTA (Field Termination Assembly) T8834 is designed to act as the main interface between a field device generating a 4-20mA signal and the Isolated Analogue Input Module T8433. The T8834 is required where the field device signal is ranged down to 0mA or the device must be powered by the FTA. Features • 20 isolated input channels per FTA. • Standard DIN rail compatibility.
TrustedTM AI/DI FTA External Power T8834 Issue Record Issue Number Date Revised by 1 Oct 05 N Owens 2 Aug 06 N Owens Issue 2 Aug 06 Technical Check Authorised by Modification Initial Issue I Vince PD-T8834 P Stock Terminations 2
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TrustedTM AI/DI FTA External Power T8834 Table of Contents 1. Description ...................................................................................................................................7 2. Installation....................................................................................................................................8 3. Associated Cable Selection .........................................................................................................8 4.
TrustedTM AI/DI FTA External Power T8834 Notice The content of this document is confidential to ICS Triplex Technology Ltd. companies and their partners. It may not be given away, lent, resold, hired out or made available to a third party for any purpose without the written consent of ICS Triplex Technology Ltd. This document contains proprietary information that is protected by copyright. All rights are reserved.
TrustedTM AI/DI FTA External Power T8834 Revision and Updating Policy All new and revised information pertinent to this document shall be issued by ICS Triplex Technology Ltd. and shall be incorporated into this document in accordance with the enclosed instructions. The change is to be recorded on the Amendment Record of this document.
TrustedTM AI/DI FTA External Power T8834 1. Description TM The Trusted 20 Channel Isolated Analogue Input FTA, T8834, provides termination for a maximum of 20 input channels from various types of field devices which generate a current loop signal. When TM used with a Trusted T8433 TMR Isolated Analogue Input module each of the inputs is individually isolated. Figure 1 below shows the configuration of a single channel.
TrustedTM AI/DI FTA External Power T8834 2. Installation TM The Trusted 20 Channel Isolated AI/DI FTA T8834 is designed to be mounted on either of the TS32 or TS35 DIN rails in the horizontal or vertical positions as required. The location of the connectors on the FTA are shown in Figure 3.
TrustedTM AI/DI FTA External Power T8834 4. Assembly Pinout Connections 4.1. CON1 Connections CON1 is a 96 Way DIN41612 socket.
TrustedTM AI/DI FTA External Power T8834 4.2. TB1 Connections TB1 is a row of screw terminals. Figure 2 shows how they are numbered.
TrustedTM AI/DI FTA External Power T8834 4.3. TB2 Connections TB2 is a row of screw terminals. Figure 2 shows how they are numbered.
TrustedTM AI/DI FTA External Power T8834 4.4. TB3 Connections TB3 is two rows of screw terminals. Figure 2 shows how they are numbered.
TrustedTM AI/DI FTA External Power T8834 5. Field Circuit Design The T8834 FTA is capable of a variety of circuit configurations. When choosing a circuit, the following points should be taken into account: • A current of around 2mA should flow through the zener diode, to provide power for the module input circuitry. • The regulated current loop should pass through the 100R precision sense resistor from top to bottom as shown in Figure 1.
TrustedTM AI/DI FTA External Power T8834 Isolated PSU + TB3 - TB3 + TB2 + CON1 VPOWER 7V5 TB1 A 100R TB1 B CON1 COMMON 4K75 CON1 VSENSE TB2 - Figure 4 0-20mA, 2 Wire, Field Sourcing Current Here, an isolated power supply in the panel provides power to the module input circuitry via the zener diode and 4K75 resistor. The field device is self powered but its range can go down to 0mA and so it cannot be used to power the input circuit.
TrustedTM AI/DI FTA External Power T8834 TB3 - TB3 + R1 (Link) TB2 + R4 (Link) R7 (unused) R10 (Link) CON1 VPOWER D1 7V5 CON1 COMMON TB1 A R13 100R R16 4K75 TB1 B CON1 VSENSE TB2 Figure 6 FTA Circuit Diagram The above diagram shows the full circuit diagram of each channel on the T8834 FTA, with the component numbers for channel 1. The channel circuits are arranged as shown in Figure 2.
TrustedTM AI/DI FTA External Power T8834 6. Specifications MIN MAX Field Current Loop (Per Channel) 0mA 30mA Field Loop Volt Drop at 20mA 9.5V if loop powered else 2V Operating Temperature -5 C (23 F) Non-operating Temperature -25 C (-13 F) 70 C (158 F) Operating Humidity (Non – condensing) 5% RH 95% RH Environmental Specifications Refer to Document 552517 Dimensions Height Width Depth 120mm (4.72ins) 336mm (13.23ins) 50mm (1.97ins) Weight 500gms (1.
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