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7908
 
 

7908

 

System 9000 backplane

 

  • Provides safe, easy wiring between the backplane and non I.S. automation systems using standard prefabricated I/O cables
  • Direct, Redundant and Duplicate signalling - including HART I/O
  • Robust, compact high-end design solution for 8 system 9000 units
  • Digital output and LEDs indicate backplane system status
  1. Overview +

  2. Technical details +


Application

  • The 7908 backplane is a compact and robust solution that enables a safe and easy connection of PR system 9000 IS device signals into standard automation systems.
  • Standard automation system cables and connectors are used to link the backplane to the I/O cards.
  • The backplane can be used for Direct, Redundant, Duplicate signalling including HART I/O System connectivity (HART MUX).
  • The system 9000 devices isolate and convert AI, AO, DI and DO signals coming from, or going to the I.S. classified area, and routes those signals to a system automation I/O card.
  • The system 9000 units maintain a SIL2/SIL3 level of functional safety, even when mounted in the backplane solution.

Technical characteristics

  • Robust, compact high-end design that holds 8 system 9000 units.
  • Digital output indicates status of the 9000 devices and primary/back-up power supplies.
  • Flexible 24 VDC supply voltage and redundant power supply connection solution.

Mounting / installation / programming

  • Flexible horizontal/vertical panel or wall mounting in the Safe or Zone 2 / Div 2 areas.
  • System 9000 devices easily snap ON and OFF using piano keys, and devices can be hot-swapped.
  • Tag number and ID labels are easily mounted and read by using the dedicated piano key spacer.
  • Wide temperature operation range: -20...+60°C.
  • Backplane selection guide can be found at www.prelectronics.com/backplane

Environmental Conditions

  • Operating temperature

    -20°C to +60°C

  • Storage temperature

    -40°C to +85°C

  • Relative humidity

    < 95% RH (non-cond.)

  • Installation in

    Pollution degree 2 & measurement / overvoltage cat. II

Mechanical specifications

  • Dimensions (HxWxD)

    144 x 247 x 141 mm

  • Wire size

    2.5 mm2 / AWG 12

    (Supply 1 / 2 and status relay connectors)

Common specifications

  • Supply

  • Supply voltage

    20...31.2 VDC (24 DC nom.)

  • Max. required power

    ≤ 30 W

  • Isolation voltage

  • Isolation voltage, test / working

    500 VAC / 50 VAC

    (Basic isolation between supply 1 & 2 and status relay)

  • Replaceable fuses

    Fuse F1 & F2: 1.6 A SB, 250 V, type TR5

Output specifications

  • Status relay

  • Max. voltage

    32 V (Zone 2 / Div. 2 area)

    42 V (Safe area)

  • Max. current

    100 mA (Zone 2 / Div. 2 area)

    100 mA (Safe area)

Observed authority requirements

  • EMC

    2014/30/EU

  • EAC

    TR-CU 020/2011

Approvals

  • UL

    UL 508 / C22.2 no. 14

  • ATEX 2014/34/EU

    DEKRA 13ATEX0136X

  • IECEx

    DEK 13.0044X

  • FM

    0003049918-C

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