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There are several symptoms that may detect poor installation or setting of the

QNA-412:

• The voltage measurements are flashing on the display. The causes may be:

− The equipment has detected an event. This may mean that there has

actually been an event in the line (correct installation) or that the pre-set

nominal voltage does not match that of the system.

− If the balance screen displays dashes: It means that the phase turn

sequence is wrong.

• Power screens with a minus sign:

− The installation is generating energy. Or actually, energy is being

generated or the current transformers are installed backwards.

− The PF values are wrong. Check the voltage phases and current

connection. The voltage and current phase do not correspond to that

connected to the QNA.

8.- SETTING THE QNA-412.

The QNA-412 is always set via a PC.

The operation of the QNA-412 analyzer will depend on the setting of the

equipment. There are two types of Set-up:

• Programming Set-up: This will define the QNA-412 analyzer's operating mode.

• File setup: This will define the variables that the QNA-412 is to record in its

internal memory

8.1.- Programming Set-up for the QNA-412.

There is a complete series of parameters that may be set in the analyzer:

8.1.1.- Voltage transformation ratio.

The QNA-412 system analyzer has the option to measure voltage via

transformers.

• Voltage primary / Voltage secondary: The voltage transformer ratio via

which the measurement shall be taken can be set. Where direct

measurements are to be made, this must be set as1/1.

• Current primary: The current transformer primary used for measuring

current can be set.

• Neutral current primary: The current transformer primary used for

measuring Neutral current can be set.

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Circutor QNA-P Series Manual do Utilizador Página 20