13
OELD Operating Instructions
Connecting the OELD to Searchline Excel
<Figure 10. Wiring Diagram for Searchline Excel>
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.
Connecting the OELD to Searchline Excel Cross-Duct (XD)
<Figure 11. Wiring Diagram for Searchline Excel Cross-Duct>
Field
Wiring
Searchline Excel
Cross-Duct
Transmitter
Searchline
Excel Cross-Duct
Receiver
To Heater
Reflector Panel
Bl
ca
k o
r B
ro
wn (
+V
)
Or
an
ge
(R
S-
48
5A
)
W
hi
te (
0 V
)
Blue
(R
S-
48
5B
)
Gr
ee
n (
Ea
rt
h)
W
hi
te (
m
A O
ut
pu
t)
Bl
ac
k (
0 V
dc
)
Re
d (+
24
V
dc
)
Green/Yellow
(Safty/Protective Ground)
Red (+24 Vdc)
Black (0 Vdc)
0 V
+24 Vdc in
4-20 mA
Green/Yellow (Safety/Protective Ground)
OELD
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.
4 Electrical Connections
