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14.2
ELECTRICAL INSTALLATION
14.2.1
INSTALLATION RECOMMENDATIONS
•
Electronic and analog signal drivers must run the plant separately from the output and power supply conductors. If possible, in grounded
conduits.
•
The power supply for electronic instruments must come from an appropriate grid for instruments.
•
RC FILTERS (noise suppressors) are recommended in contactor coils, solenoids, etc.
•
In control applications, it is essential to consider what could happen when some part of the system fails. The device’s internal devices do not
ensure total protection.
•
The electrical connection terminal blocks must be made with the device’s marked connection terminals. Before connecting them, make sure
that the connections have been made correctly.
•
Remember to wrap all wires inside the desired openings, designed for their passage, before making any electrical connections.
•
If you use thermocouple type sensors and want to use grounded thermocouples, you must take care that the installation does not generate
ground loops that could influence the correct temperature measurement by the device. This could generate false offsets, reading oscillation,
possibly malfunction or even burn the device. The power supply input for the
LogBox Wi-Fi
analog sensors does not have galvanic isolation.
Thus, grounded sensors on application equipment may create ground loops and influence the measurement. Use insulated thermocouples or, if
grounded thermocouples are required, choose a power supply that provides good galvanic isolation to the device. You can also avoid ground
loops by powering the device from the battery only, with no USB or external source.
14.2.2
SPECIAL PRECAUTION
By being an electronic module,
LogBox Wi-Fi
needs some care when handling:
•
When opening the cover that provides access to the connector for battery replacement, due to the risk of damage caused by static electricity,
avoid contact of the connection terminal blocks with them and with the electronic circuit.
•
The device should not be opened due to the risk of damage caused by static electricity when the device has its electronic circuit exposed.
•
Pay close attention to the sensor wires, the digital input, the digital output, and the external source connections.
14.2.3
ELECTRICAL CONNECTIONS
LogBox Wi-Fi
has 4 detachable connection terminal blocks for connection of external power supply, digital output load, digital input sensor, and
analog sensors for each of the 3 available analog channels. Figure below
illustrates electrical connections in a basic way:
Figure 55 –
Electrical connections
For the sensors connection, it is recommended that the connection terminal blocks be previously detached from the device. To streamline the
sensors connection, it is necessary to use the enumeration printed on the connectors and the Electrical Connections image in the figure above, and
in the Connections’ Protection Cover.
The power supply, digital output, digital input, and analog inputs terminals are not isolated from each other!
Therefore, analog, and digital signals from the same voltage source must not be used, otherwise the device will
malfunction.
14.2.3.1
POWER SUPPLY
The connection to the Power Supply is made at the terminals according to the following
image. The power supply used must be of the direct current type, with a voltage
between 10 and 30 V and provide a minimum current of 15 mA when no load is
connected to the digital output. If the load is connected to the digital output, the source
used must be able to provide current compatible with the load used.
