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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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