Campbell Scientific PWS100 Present Weather Sensor - Manual (Page 119)

Appendix C. Cable Selection
C.1 Power Cable
The PWS100 is provided pre-wired with a default 10 m power cable as shown
in Figure C-1. This cable should be grounded using the cable screen at both
ends. One end is to be connected to the power sources for the DSP (12V) and
hood heaters (24V) the other is fed through the cable gland on the base of the
PWS100 DSP enclosure and fixed in the DSP terminal strip as shown in Figure
C-2.
If another cable is to replace the pre-wired cable then it is normally
recommended that the same cable is used and the wiring color scheme shown
in Figures C-1 and C-2 is followed to avoid confusion
However, alternative cable can be used and may be required for longer cable
runs to reduce voltage drops in the cable. Wire with larger diameter conductors
may be needed especially for the 24 V heater supply, as any reduction below
24V will limit the heaters effectiveness.
To remove the existing cable, unscrew the cable gland until the cable is loose
then locate the individual termination points of the wires. Using a small flat
blade screwdriver, press down the tab on the top of the terminal strip at the
point of the wire connection and pull the wire from the front slot. Carry this out
for all of the wires in the cable and then pull the cable from the cable gland
until free. Insert the new (stripped) cable and insert the wires into the
corresponding positions one by one by again depressing the tab on top of the
terminal strip and then securely pushing the stripped end of the wire fully into
the front slot.
If the power cable is incorrectly wired to the DSP unit
then irrevocable damage can be done to the PWS100
unit. WARNING
C-1