Before making any signal connections from the hazardous are, make sure any Intrinsically Safe energy-storing devices (i.e. devices
not
classified as “simple apparatus”) are certified as being compatible with the barriers to which they will be connected. Check
also
that the connecting cables conform with the cable types specified by the safety documentation and that the maximum cable
parameters specified in the IS catalogue are not exceeded. In general, cable parameters are unlikely to present problems except in
installations where cables longer than 500 meters are called for in IIC applications.
5.2.2.
Wiring
The following steps outline how to connect the signal line connections to an ARL-BR-IS Series Safety Barrier. Please note, in most
cases, the Barrier will come pre-wired using the recommended cable specifications so you do not have to perform these steps.
1.
Unscrew the top 6 screws from the enclosure and remove the lid to access the barrier board inside it.
2.
The barrier board will have clearly marked screw terminals for connecting the signal lines. For illustrations on how the barrier
terminals are mapped to their respective signal lines, please refer to page 2 of the ARL-BR-IS Series Datasheet (Doc #6200). Note
–
Based on your barrier model, only certain terminal blocks will be populated on the board.
3.
Pass your cable wire into the provided strain relief from the safe area. Do the same for the hazardous area.
4.
Connect the wires as designated below depending on your barrier model type.
Table 3: Wiring Map
MODEL
SIGNAL EXAMPLES
SAFE AREA
HAZARDOUS AREA
Terminal Block
Pin
Terminal Block
Pin
ARL-BR-IS-PWR
5VDC Line (or less)
PWR-485 (P+)
1
PWR (P+)
9
GND
PWR-485 (P-)
2
PWR (P-)
10
ARL-BR-IS-LC
LC Exci (E+)
or RS422 (A)
Loadcell-LC (E+)
5
LC-EXC (E+)
13
LC Excitation - (E-)
or RS422 (B)
Loadcell-LC (E-)
6
LC-EXC (E-)
14
LC (S+)
or RS422 (Y)
Loadcell-LC (S+)
7
LC-SIG (S+)
15
LC Signal - (S-)
or RS422 (Z)
Loadcell-LC (S-)
8
LC-SIG (S-)
16
ARL-BR-IS-RS
RS-485 (A)
PWR-485 (A)
3
485 (A)
11
RS-485 (B)
PWR-485 (B)
4
485 (B)
12
ARL-BR-IS-PWR-RS
5VDC Line (or less)
PWR-485 (P+)
1
PWR (P+)
9
GND
PWR-485 (P-)
2
PWR (P-)
10
RS-485 (A)
PWR-485 (A)
3
485 (A)
11
RS-485 (B)
PWR-485 (B)
4
485 (B)
12
ARL-BR-IS-PWR-LC
5VDC Line (or less)
PWR-485 (P+)
1
PWR
9
GND
PWR-485 (P-)
2
PWR
10
RS422 (A)
Loadcell-LC (E+)
5
LC-EXC (E+)
13
RS422 (B)
Loadcell-LC (E-)
6
LC-EXC (E-)
14
RS422 (Y)
Loadcell-LC (S+)
7
LC-SIG (S+)
15
RS422 (Z)
Loadcell-LC (S-)
8
LC-SIG (S-)
16
5.
Make sure all the connections are correct.
6.
Screw the lid back onto the barrier enclosure using the previously removed screws.
7.
Connect the Earth ground in the provided ground lug.
8.
Remount the barrier as instructed in the previous sections.
5.2.3.
Power Supply Connections, Grounding and General Considerations
Care must be taken that if the barriers are connected to the a safe are power supply, these connections must be made correctly. If
the internal fuse blows, it will destroy the ARL-BR-IS-Series barriers.
The barrier is equipped with a green ground lug. Use this ground lug to accomplish your IS ground requirements. Please refer to Doc
#5213
–
Installation and Wiring Diagram for further details.
