Eaton PowerXL DG1 - Chapter 4-Safety and Switching; Fuses and Cable Cross-Sections; Residual-Current Device (RCD)

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Chapter 4—Safety and switching
POWERXL SERIES VFD MN040002EN—February 2018 www.eaton.com
Chapter 4—Safety and switching
ote: N All following information is strongly recommended
butis not necessary if sufficient system design
andvalidation has been completed.
Fuses and cable cross-sections
The fuses and wire cross-sections allocated for power-side
connections depend on the rated input current and output
current of the frequency inverter (without ACchoke).
CAUTION
When selecting the cable cross-section, take the voltage
drop under load conditions into account.
The consideration of other standards (for example, VDE 0113
or VDE 0289) is the responsibility of the user.
The national and regional standards (for example VDE 0113,
EN 60204) must be observed and the necessary approvals
(for example UL) at the site of installation must be fulfilled.
When the device is operated in a UL-approved system, use
only UL-approved fuses, fuse bases, and cables.
See Appendix D–Safety Instructions for UL and cUL
fordetails.
CAUTION
The specified minimum PE conductor cross-sections
in this manual must be maintained. The minimum size
of the protective earthing conductor must comply with
the requirements of EN61800-5-1 and/or the local
safetyregulations.
Touch currents in this frequency inverter are greater than
3.5mA (AC). According to product standard IEC/EN 61800-5-1 ,
an additional equipment grounding conductor of the same
cross-sectional area as the original protective earthing
conductor must be connected, or the cross-section of the
equipment grounding conductor must be at least 10mm
2
Cu.
Choose the cross-section of the PE conductor in the motor
lines at least as large as the cross-section of the phase
lines(U, V, W).
Cables and fuses
The cross-sections of the cables and line protection fuses
used must correspond with local standards.
For an installation in accordance with UL guidelines:
•
Use UL listed Class RK5, J, T or equivalent fuses for the
branch circuit protection
•
Use 75 °C or higher copper wire only
•
Use UL listed conduit fittings with the same type rating
(Type 1/Type 12) as the enclosure
See Appendix D–Safety Instructions for UL and cUL
fordetails.
Use power cables with insulation according to the specified
input voltages for the permanent installation. A shielded
cable is not required on the input side.
A completely (360°) shielded low impedance cable is
required on the motor side. The length of the motor
cable depends on the RFI class and must not exceed
approximately 300ft (100 m) without additional filtering.
Residual-current device (RCD)
RCD (Residual Current Device): Residual current device,
residual current circuit breaker (FI circuit breaker).
Residual current circuit breakers protect persons and
animals from the existence (not the origination) of
impermissibly high contact voltages. They prevent
dangerous, and in some cases deadly injuries caused by
electrical accidents, and also serve as fire prevention.
CAUTION
This drive can cause a DC current in the protective earthing
conductor. Where a residual current-operated protective
(RCD) or monitoring (RCM) device is used for protection in
case of direct or indirect contact, only an RCD or RCM of
Type B is allowed on the supply side of this product.
Figure 12. Identification on the FI circuit breakers
AC/DC sensitive
(R CD, type B)
Frequency inverters work internally with rectified AC
currents. If an error occurs, the DC currents can block a
type A RCD circuit breaker from triggering and therefore
disable the protective functionality.