2 Engineering
2.3 Safety and switching
54
DA1 Variable Frequency Drives
08/18 MN04020005Z-EN
www.eaton.com
2.3.5 Mains contactors
The mains contactor enables operational switching on and off of the supply
voltage for the variable frequency drive and switching off in case of a fault.
The mains contactor is designed based on the mains-side input current I
LN
of
the DA1 variable frequency drive for utilization category AC-1 (IEC 60947)
and the ambient air temperature at the location of use.
→
The mains contactors listed here are based on the variable
frequency drive’s rated input-side mains current I
LN
without an
external mains choke.
These are selected based on thermal current I
th
= I
e
(AC-1) at
the indicated ambient temperature.
WARNING
Push-to-run operation is not permissible via the mains contactor
(Pause time
≧
30 s between switching o
ff
and on).
→
For UL-compliant installation and operation, the mains-side
switching devices must allow for a 1.25 times higher input
current.
→
For the rated mains contactors for DA1 variable frequency
drives, please refer to the technical data chapter
in