Fuji Electric frenic mini series, User Manual

Page: 84 / 269

6-2
6.2 Selecting Wires and Crimp Terminals
This section contains information needed to select wires for connecting the inverter to commercial
power lines, motor or any of the optional equipment. The level of electric noise issued from the
inverter or received by the inverter from external sources may vary depending upon wiring and
routing. To solve such noise-related problems, refer to Appendix A "Advantageous Use of Inverters
(Notes on electrical noise)."
Select wires that satisfy the following requirements:
- Sufficient capacity to flow the rated average current (allowable current capacity).
- Coordination with an overcurrent circuit breaker such as an MCCB in the overcurrent zone
for overcurrent protection
.
- Voltage loss due to the wire length is within the allowable range.
- Suitable for the type and size of terminals of the optional equipment to be used.
Recommended wires are listed below. Use these wires unless otherwise specified.
■ 600V class of vinyl-insulated wires (IV wires)
Use this class of wire for the power circuits. This class of wire is hard to twist, so using it for the
control signal circuits is not recommended. Maximum ambient temperature for this wire is 60
°
C.
■
600V class 2 of wires or 600V class polyethylene-insulated wires (HIV wires)
As wires in this class are smaller in diameter and more flexible than IV wires and can be used at a
higher ambient temperature (75
°
C), they can be used for both of the main power and control signal
circuits. To use this class of wire for the control circuits, you need to correctly twist the wires and
keep the wiring length for equipment being connected as short as possible.
■ 600V class of cross-link polyethylene-insulated wires (FSLC wires)
Use this class of wire mainly for power and grounding circuits. These wires are smaller in diameter
and more flexible than those of the IV and HIV classes of wires, meaning that these wires can be
used to save on space and increase operation efficiency of your power system, even in high
temperature environments. The maximum allowable ambient temperature for this class of wires is
90
°
C. The (Boardlex) wire range available from Furukawa Electric Co., Ltd. satisfies these
requirements.
■ Shielded-Twisted cables for internal wiring of electronic/electric equipment
Use this category of cables for the control circuits of the inverter so as to prevent the signal lines
from being affected by noise from external sources, including the power input/output lines of the
inverter themselves. Even if the signal lines are inside the power control cabinet, always use this
category of cables when the length of wiring is longer than normal. Cables satisfying these
requirements are the Furukawa's Bmex S shielded cables of the XEBV and XEWV ranges.