User guide

User Guide
7
AC-ADAPT2, simply strip an appropriate length of the cable sheath, and secure
the wire under the screw terminals.
3.2.3 Installation of the Adapter
All low voltage power cables should have two cores at least 22SWG (0.71mm)
thick. You may find that standard AC power cable is suitable. The cable run from
the AC adapter to the charger module can be extended for several hundred metres
if necessary, but if high current demands are anticipated, use thicker cable to
prevent significant voltage drop.
If the cable runs through areas where there might be a chance of electromagnetic
interference, the use of a screened cable is advised, where the screen is connected
at one end only (for example to the enclosure grounding point).
When installing the cable within an enclosure, it is best to route the power input
cables as far as possible from the signal cables in order to avoid noise injection
into the signal cables. It may also be advisable to use screened power cable if high
current is being taken from the AC-ADAPT2, as the current flowing in the power
cable will cause radiation of 50Hz noise.
For safety reasons, both the AC-ADAPT and AC-ADAPT2
adapters should always be installed in a dry, condensation-
free environment. Where the AC supply is some distance
from the datalogger installation, it is recommended that the
AC adapter is mounted in a dry situation adjacent to the AC
power outlet, and only the safer, low-voltage, cable is
extended from the adapter to the datalogger enclosure.
3.3 Installation of the Power Supply Unit
The power supply units are designed to be mounted on a chassis plate using the
four corner mounting holes. Fittings are provided for mounting to a Campbell
Scientific enclosure chassis. To avoid damage during shipping, lead-acid batteries
are sometimes packed separately. Install the battery into the carrier and connect
the battery lead to the battery connector on the charger unit, or, if no charger is
being used, connect to the appropriate in-line power connector. You should also
check the integrity of any in-line power connectors and the power plug on the
datalogger itself before powering up the system.
When attaching wires to a CH100 charger module, allow enough spare wire to
ensure easy removal of the battery at a later date.
CAUTION