NOVUS AUTOMATION
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5.2
ELECTRICAL INSTALLATION
5.2.1
RECOMMENDATIONS FOR INSTALLATION
•
Signal conductors should run through the plant separately from the power supply and output conductors, if possible in grounded conduits.
•
The power supply for electronic instruments must come from an appropriate grid for instruments.
•
RC FILTERS (noise suppressor) are recommended in contactor coils, solenoids, etc.
•
In control applications, it’s essential to consider what could happen when some part of the system fails. The device’s internal devices do not
ensure total protection.
•
Grounding helps limit the effects of noise due to electromagnetic interference (EMI). Run the grounding connection by using the grounding bolt
and the grounding plane before turning on the device.
5.2.2
SPECIAL PRECAUTION
Because the transmitter is an electronic module, it requires some care when handling:
•
When opening the transmitter to connect electrical wiring, avoid contact with the electronic circuit due to the risk of damage caused by static electricity.
•
Pay close attention when connecting wires.
•
Remember to pass all wires through a cable clip before completing electrical connections.
•
When closing the housing, the cover should be placed again properly, ensuring proper sealing for this model.
5.2.3
ELECTRICAL CONNECTIONS
Fig. 21
–
RHT
Climate
electrical connections
* Connector CN2 is only mounted on models that have RS485 interface (Optional).
5.2.4
USB CONNECTION
Fig. 22
– USB cable connection
5.3
SENSOR MAINTENANCE
5.3.1
PRECAUTIONS WITH SENSORS
The sensor used in the RHT
Climate
Transmitter is a device that is sensitive to electrostatic discharge (ESD).
Whenever the sensor is touched, measures need to be taken to prevent ESD damage.
The sensor may be damaged or lose its calibration if exposed to atmospheres contaminated with chemical
agents. Hydrochloric Acid, Nitric Acid, Sulfuric Acid and Ammonia at high concentrations can damage the
sensor. Acetone, Ethanol and Propylene Glycol can cause reversible measurement errors.
The humidity sensor’s calibration can be altered if it is exposed to contaminating vapors or extreme humidity and temperature conditions for
prolonged periods. To speed up calibration restore, proceed as described below:
•
Carefully remove the sensor from the capsule, avoiding contact with bare hands (it must be removed with the use of plastic tweezers or clean
antistatic gloves);
•
If there are solid particles on the sensor, wash it with deionized water at room temperature;
•
Place the sensor in an oven at 120 °C (+/-10 °C) for 6 hours;
•
Carefully replace the sensor in the capsule.
It is also possible to clean or dry the sensor using filtered and oil-free air, taking care that the air jets do not mechanically damage the sensor.
