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4.2.6 Precautions for Connection
(1) The control supply and sensor input (CT and ZCT secondary) should use
twisted pair wires (twisted at less than 25 mm pitch). CT has a polarity,
so be sure to check the polarity before making connection.
The sensor input wires (ZCT, ZPD) entering the capacitor-voltage-division
type directional ground module should be shielded wires.
(2)
Figure 10 shows an example external connection for the
SZE21.
Use this
diagram as a reference in making connections.
(3)
When
the external cable to be connected is long, or
the.number
of cores in
the rulticore cable is large, or the power waveform is deformed. a voltage
in excess of the input ON level may occur depending on the cable capacitance
between cables even when the contacts are open, causing undesired operation.
In this case. to reduce the input impedance and therefore the generated voltage,
a capacitor or resistor may be added to the input terminal and the power supply
T-phase or a shielded cable with low cable capacitance may be used.
(4) External cable should be laid isolated from the power cables and
high-
voltage cables.
Laying external cable close to the power and high-voltage cables will result in
an inducted voltage being generated, causing phenomena similar to the above
item
(3).
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