Safety And Switching; Disconnecting Device; Fuses - Eaton PowerXL DB1 Installation Manual

2 Engineering

2.4 Safety and switching

2.4 Safety and switching

2.4.1 Disconnecting device

2.4.2 Fuses

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A symmetrical, fully screened (360°), low-impedance motor cable must be
used. The length of the motor cable depends on the RFI class and the envi-
ronment.
For US installations, UL-listed cables (AWG) should be used exclusively.
These cables must have a temperature rating of 70 °C (158 °F), and will often
require installation inside a metal conduit (please consult the applicable local
standards).
￫
For the rated cable cross-sectional areas for DB1 variable fre-
quency drives, please refer to ￫ section 5.4, "Cable cross-
sections", page 81.
￫
Install a manual disconnecting device between the mains con-
nection and the DB1 variable frequency drive. This disconnect-
ing device must be designed in such a way that it can be inter-
locked in its open position for installation and maintenance
work.
In the European Union, this disconnecting device must be one of the follow-
ing in order to comply with European Directives as per standard EN 60204-1,
"Safety of machinery":
• An AC-23B utilization category disconnector (EN 60947-3)
• A disconnector with an auxiliary contact that in all cases will disconnect
the load circuit before the disconnector's main contacts open
(EN 60947-3)
• A circuit-breaker designed to disconnect the circuit as per EN 60947-2
In all other regions, the applicable national and local safety regulations must
be complied with.
The DB1 variable frequency drive and the corresponding supply cables must
be protected from thermal overload and short-circuits.
￫
The fuse ratings and cable cross-sectional areas (wire gauges)
for the connection on the mains side will depend on the DB1
variable frequency drive's input current I
￫
For the recommended fuse sizing and assignments, please
refer to ￫ section 5.5, "Fuses", page 82.
The fuses will protect the supply cable in the event of a short-circuit, limit any
damage to the variable frequency drive, and prevent damage to upstream
devices in the event of a short-circuit in the variable frequency drive.
DB1 Variable Frequency Drives 09/17 MN040031EN www.eaton.com
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