1
INM9491 Rev 3
1 FEATURES
♦ Isolated power supply
♦ Zone 2 and Division 2 mountable
♦ DIN-rail or backplane mounting
♦ ATEX / IECEx approvals
♦ FM (USA & Canada) approved
♦ 200mA @10.9V DC - Ex ia IIB Groups C, D output
♦ 400mA @11.8V DC - Ex ib IIB output
♦ Power over Ethernet option (PoEx)*
♦ Multiple outputs achieved by ganging 9491 modules using 24V DC power distribution
backplane
*Note – PoEx is a simple adaptation of the IEEE 802.3af Power over Ethernet (PoE) standard to
bring the benefits to the 9400 Range of Hazardous Area devices. This allows two spare pairs in the
existing Cat5e cable to distribute the power supplied to a 9466 Ethernet Switch (Power Sourcing
Equipment – PSE) to each of the devices connected to its five ports (PD – Powered Device). This
adaptation is necessary due to restrictions for Hazardous Area use. It is not implied that the device
conforms to the 802.3af (PoE) standard.
2 DESCRIPTION
The 9491-PS Power Supply is the recommended method for supplying the 9460-ET series of
intrinsically safe Ethernet modules and is based on an isolating power supply. It takes a 24V DC
safe area / Zone 2 / Division 2 supply and produces an intrinsically safe, 12V DC nominal output
capable of powering any one of the 94xx Series Ethernet modules mounted in a Zone 1 / Division 1
hazardous area. The 9491-PS may be mounted in a safe area, Zone 2 or Division 2 hazardous area.
The output can be from either the Ex ia IIB Groups C, D or Ex ib IIB output connectors depending
upon application. The ‘ib’ IIB output providing a higher useable output power where the Gas Group
and Zone allows. See Figures 2.1 and 2.2 for connection details.
INM9491 Rev 3
9491-PS IS Power Supply
To Next Page
Loading...
