18V

Battery

Gnd

System Power

Gnd

+24V DC

-

+

Battery Interface

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Battery

Interface

Module

The battery interface module is used to trickle charge the lead acid batteries used to provide alternative power to the NDACS data logger in case of mains supply failure. When the mains power supply is disconnected the output from the battery pack is connected automatically to the to the NDACS logger and WaveCOM modem. No loss of data will occur when the batteries are switched in. The charge current is approximately

Battery Back-up In-line Fuse

Rating 5A

The lead acid battery positive power lead contains an in line 5A fuse to act as a current limiter and switch. The fuse protects the batteries in case of supply failure and limits the amount of current that can be drawn in case a short circuit appears on the supply to the instrumentation and protects the batteries.

To remove the fuse simply lift the fuse restrain lever. This action will power off the instrumentation after removing the mains supply.

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24V DC Power Supply

Fig 4 shows the 24V DC power supply used as the power supply for the instrumentation when operating with mains electrical power. The power supply contains a green status LED which is illuminated when operating on mains electricity but off when the instrumentation running on batteries.

Fig w

Mains Supply Fuse

Fig 3 shows the mains supply fuse. Remove the fuse to isolate the instrumentation from the mains supply.

Removing this fuse with the battery pack connected will force the instrumentation to run from the batteries.

Rating 5A

Pin-out

A = System Power B = Battery +
C = Gnd F = Gnd
G = Gnd H = +24V DC

Electrical Systems Components

Fig-2

Fig-3

Fig-4

Fig-5

The following section details the different electrical components and their specifications making up the Tide level Monitoring system. When replacing the fuses and to ensure that the systems is protected ensure that only components to the defined rating are used.

Only technical competent personnel should work on this system. Do not touch the instrumentation with wet hands. Ensure that the system is Earthed at all times. Remove the mains power using the isolator before adjusting any cabling.