Iskra PNA 784, Быстрое руководство

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Connection
Portable Network Analyzer PNA784 - Quick Guide 15
provided on connectors of A1257 flex current clamps; A1287 flex current clamp has a single output
connector with no indication. Connect corresponding A1257/A1287 flex current clamps outputs to
Portable Network Analyzer PNA784 current clamps inputs I1, I2, I3 and IN. Connect a connector of
A1257 flex current clamps I1 to the Analyzer current clamps input terminal I1. Connect a connector
of A1257 flex current clamps I2 to the Analyzer current clamps input terminal I2. Connect a
connector of A1257 flex current clamps I3 to the Analyzer current clamps input terminal I3.
Connect a connector of A1287 flex current clamp to the Analyzer current clamps input terminal IN.
Embrace the L1 phase conductor with I1 flex current clamps A1257.
Embrace the L2 phase conductor with I2 flex current clamps A1257.
Embrace the L3 phase conductor with I3 flex current clamps A1257.
Embrace the LN phase conductor with flex current clamps A1287.
Flex current clamps are provided with an arrow indicating energy direction. If connection is wrong,
displayed power on the Analyzer is negative.
Check that current clamps are clamped well, otherwise the measurement will not be correct.
Perform voltage connections. First, connect an N neutral terminal and then phases L1, L2 and L3.
Always connect a measuring voltage connection wire to a measuring terminal on the Portable
Network Analyzer PNA784 and only then connect the measuring object. Use only enclosed safety
measuring voltage connection wires. Voltage inputs of Portable Network Analyzer PNA784 can be
connected directly to low-voltage network or via a voltage measuring transformer to a high-voltage
network.
To disconnect the Portable Network Analyzer PNA784 from the measuring object use the opposite
order. First, disconnect measuring voltage connection wires from the measuring object and only
then from the Portable Network Analyzer PNA784. Then remove A1257/A1287 flex current clamps
from the measuring object. Hold down a blue key for 5 seconds in order to switch off A1257/A1287
flex current clamps. Then disconnect a cable for supplying A1257/A1287 flex current clamps. At the
end, disconnect A1257/A1287 flex current clamps from the Portable Network Analyzer PNA784
terminals. Switch off the Portable Network Analyzer PNA784 auxiliary power supply.
Please refer to figure 3.6 for wired three phase, four wire connection with unbalanced load -
connecting external current transformers to current inputs K/L I1, K/L I2, K/L I3 and K/L IN.
Single-phase measurements
For a single-phase connection, use only current I1, voltage L1, neutral conductor N and earth
terminal. The connection procedure is similar to three-phase connection; the only difference is that
only one phase is connected in this case. Choose 1b connection by means of the keys on the
Portable Network Analyzer PNA784.
Please refer to figure 3.1 for single phase connection with flex current clams and to figure 3.4 for
wired single phase connection.
Choose a corresponding meter connection from the figures below and connect voltage and
current conductors.