16-Channel Digital Input Termination Card 24Vdc

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1 TDI16AIA 16-Channel Digital Input Termination Card 24Vdc (TDI16AIA) Issue 3 October 2005 INTRODUCTION PURPOSE The TDI16AIA 16-channel digital input termination card acts as an interface between the digital signalling devices in the field device and the digital input circuits of an SC300E chassis. It provides: Screw terminal connectors for the field wiring Power supply inputs for the field devices Fuse protection for the field loops with local and remote indication of fuse failure Overvoltage and transient protection This document is intended to provide a general understanding of the function of the TAI16AIA, sufficient to enable basic maintenance operations to be effected in the field. ASSOCIATED DOCUMENTATION Reference Title MDI32BIS 32-Channel Digital Input Module User Manual PDD24 Power Distribution Panel User Manual

2 SPECIFICATION Model Power Supply inputs TDI16AIA Has two separate connectors (FS1and FS2) for redundant dc power supplies. The positive supplies feed a common bus via auctioneering diodes. When auctioneering takes place outside the card, the required power may be supplied via a single connector. No. of digital input channels 16 Nominal field supply voltage Maximum field supply voltage Current rating 24Vdc 33Vdc 50mA per channel. NOTE: In normal operation when used with a Digital Input Module having a 10k ohm input resistance, the current in each channel will be 2.4mA with 24V field supply. Fuse in each positive line to field Chassis cable connector Field cable connector Fuse blown indication 1A, fast acting, indicating 34 way DIN41612 Screw terminals to suit 2.5mm 2 wire (16AWG) Local: Fuse blown LED (one per card) Remote: Fuse blown alarm output (PL1) can be connected to Fuse blown LED on Power Distribution Panel (PDD24). Transient suppression Safety ground terminal TS1 Overall size (mm) Overall size (inches) Weight A transient suppressor device between each field return line and a common 0V bus clamps the field return line voltage (with respect to 0V common) as follows: +37Vdc to 1mA (maximum for continuous overload) 69A maximum peak pulse current for 8ms to 20ms M3 threaded bush provision for a ring terminal. Allows the common 0V supply bus to be grounded via a 10k ohm resistor. Prevents the channels from floating if the card is disconnected from the chassis 162L x 125W x 107H 6.4L x 4.9W x 4.2H 0.35kg 2 TAI16AIA October 2005 Issue 3

3 TDI16AIA 16-Channel D/I Termination Card 24Vdc ENVIRONMENTAL SPECIFICATIONS The maximum ambient temperature measured at the hottest point within the Triguard system shall not be greater than 60 degrees centigrade. Temperature operating: +5 C to +60 C Temperature storage: -25 C to +70 C Humidity: 5% to 95% non-condensing at ambient < 40 C EMC/RFI Immunity: Tested and certified to IEC 1131-Part Vibration/Shock: Tested and certified to IEC 1131-Part Certification: General Certification: Ref. SC300E TMR Product Guide (ref ). TRANSPORT AND HANDLING The termination card must be transported and stored in its original packing material which should be retained for this purpose. TDI16AIA October 2005 Issue 3 3

Connection to the chassis backplane is via a multicore cable terminated at either end by a DIN41612 connector.

4 TECHNICAL DESCRIPTION PHYSICAL The TDI16AIA comprises a PCB assembly mounted in a moulded carrier that can be snapped onto all commercially available styles of DIN mounting rail. Connection to the chassis backplane is via a multicore cable terminated at either end by a DIN41612 connector. Figure 2-2 shows the TDI16AIA with the DIN41612 connector attached and mounted on rail EN type NS 35/5. Figure 2-1 identifies the main components on the PCB. Figure 2-1 General view and component layout 4 TAI16AIA October 2005 Issue 3

5 TDI16AIA 16-Channel D/I Termination Card 24Vdc Figure 2-2 Leading dimensions and mounting schematic TDI16AIA October 2005 Issue 3 5

6 Figure 2-3 Circuit diagram showing a single channel 6 TAI16AIA October 2005 Issue 3

7 TDI16AIA 16-Channel D/I Termination Card 24Vdc EXTERNAL CONNECTIONS Fixed Terminal Field terminals 1 to 16 (+) and 1 to 16 (-) Chassis connector J1 Field power supply inputs FS1 and FS2 Alarm output PL1 Ground terminal TS1 Details Screw terminals to suit 2.5mm 2 wire Connector, 34-way,DIN41612,female Header, 2-way, Molex Minifit Jr Header, 2-way, Molex KK Provision for M3 ring terminal THEORY OF OPERATION Figure 2-3 is a circuit diagram showing a typical digital input channel. Power supplies for the termination cards are normally provided by a Power Distribution Panel PDD24 which performs diode auctioneering of its dual redundant power supplies. Power for the digital input circuits (normally from the PDD24) is fed to input FS1 or FS2. Where the PDD24 is not used and dual supplies are required, these are connected to FS1 and FS2 respectively and auctioneered on the termination card by D17 and D18. Each digital input channel is powered via an indicating fuse from a common +ve bus. The fuse failed output from each fuse is connected to a common alarm bus. If any fuse fails, local indication is provided by the illumination of Fuse blown LED LD1. A signal to operate a remote alarm is available at Alarm output PL1. NOTE The PDD24 has a Fuse blown alarm indicator with provision for multiple inputs. This facility can be wired to provide fuse blown indication for an entire cabinet. The -ve bus may be grounded via TS1 if required, preventing the power supplies from floating when the chassis cable is disconnected. TDI16AIA October 2005 Issue 3 7

8 TRANSIENT SUPPRESSION A transient suppressor is fitted across each digital input channel input to the SC300E chassis. It provides a discharge path for transient energy pulses that may appear on the digital input line following lightning strikes etc. The suppressor is effectively a zener diode with a breakdown voltage just above that of the normal supply voltage. In normal operation, therefore, the suppressor does not conduct (apart from leakage current). In the presence of a transient pulse, zener breakdown occurs. The voltage developed across the suppressor varies to some extent with the pulse current and is known as the clamping voltage. The following characteristics are typical: Table 2-1. Transient suppressor characteristics Clamping Voltage Pulse currents Pulse duration Comments +37V to +43V *1mA Continuous *Maximum current continuous overload +70V **6gAmps 8 to 20 υs **Maximum peak pulse current SUPPLEMENTARY INFORMATION Table 2-2 lists the digital input channel wiring connections and associated fuses for connectors J1 and J2. Pin J1-1a is connected to the +ve bus (Figure 2-3 ). Pins J1-1c and J2-1c are interconnected. J1/J2 pins other than J1-1a, J1-1c, J2-1c and those listed in Table 2-2 are not connected. 8 TAI16AIA October 2005 Issue 3

9 TDI16AIA 16-Channel D/I Termination Card 24Vdc Table 2-2. Digital input channel connections Screw terminals DIN41612 Connector J1 Channel Field loop input signal Field loop return from field device Field loop fused (+ve) input to chassis Field loop fused input return (-ve) Fuse 1 1(+) 1(-) J1-2a J1-2c F1 2 2(+) 2(-) J1-4a J1-4c F2 3 3(+) 3(-) J1-6a J1-6c F3 4 4(+) 4(-) J1-8a J1-8c F4 5 5(+) 5(-) J1-10a J1-10c F5 6 6(+) 6(-) J1-12a J1-12c F6 7 7(+) 7(-) J1-14a J1-14c F7 8 8(+) 8(-) J1-16a J1-16c F8 g g(+) g(-) J1-18a J1-18c Fg 10 10(+) 10(-) J1-20a J1-20c F (+) 11(-) J1-22a J1-22c F (+) 12(-) J1-24a J1-24c F (+) 13(-) J1-26a J1-26c F (+) 14(-) J1-28a J1-28c F (+) 15(-) J1-30a J1-30c F (+) 16(-) J1-32a J1-32c F16 TDI16AIA October 2005 Issue 3 g

10 SERVICING SCOPE The TDI16AIA contains all-passive circuitry that is extremely robust. Servicing operations will therefore not normally extend beyond the replacement of failed fuses. CAUTION Before replacing a failed fuse, ascertain the cause of failure, and take the appropriate remedial action. CONFIGURATION No configurable links. 10 TAI16AIA October 2005 Issue 3

11 TDI16AIA 16-Channel D/I Termination Card 24Vdc SERVICE SUPPORT SPARE PARTS Spare parts and technical advice can be obtained from your local area offices. LIST OF SPARES Circuit Ref Part No Details F1 to F A Indicating fuse TAI16AIA October 2005 Issue 3

16-Channel Digital Input Termination Card 24Vdc

TDI16BIA 16-Channel Digital Input Termination Card 24Vdc (TDI16BIA) Issue 3 October 2005 INTRODUCTION PURPOSE The TDI16BIA16-channel digital input termination card acts as an interface between the digital