12
OELD Operating Instructions
4 Electrical Connections
Caution
When using the SHC-1 it must always be connected to the OELD using the SHC Protection Device.
Note
The OELD is protected against accidental reverse polarity connection of power
Spare conductors must be suitably terminated. Wiring must be in accordance with local, national and/or company regulations.
Exposed, bare conductors must be avoided.
The following diagrams show the wiring of the OELD to Searchpoint Optima and Searchline Excel. For other sensors, refer to the
manufacturer’s wiring details.
Caution
The maximum permissible mA loop voltage is 32 VDC and the maximum current is 22 mA.
Connecting the OELD to Searchpoint Optima Plus
<Figure 9. Wiring Diagram for Searchpoint Optima Plus>
Green/Yellow (Safety/Protective Ground)
Red (+24 Vdc)
Black (0 Vdc)
White (4-20 mA Output)
0 V
+24 Vdc in
4-20 mA
OELD
Field
Wiring
Blue (RS-485B)
Orange (RS-485A)
The earth bonding arrangement must ensure that the maximum peak voltage between the unit case earth and any field cable
conductor is less than 350V. Voltages in excess of this can cause permanent damage to the units’ internal RFI protection filters.
