CIRCUTOR QNA-P Series - Manual (Page 20)

Page no. 19
Comments
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.