2 Engineering
2.4 Safety and switching
42
DC1…20… and DC1…OE1 Variable Frequency Drives
02/20 MN040059EN
www.eaton.com
2.4.5 Mains contactors
The mains contactor enables an 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 DC1 variable frequency drive for utilization category AC-1
(IEC 60947) and the ambient air temperature at the location of use.
￫
While planning the project, please make sure that inching
operation is not done via the mains contactor of the variable
frequency drive on frequency-controlled drives, but through a
controller input of the variable frequency drive.
The maximum permissible mains voltage switch-on frequency
for the DC1 variable frequency drive is once every 30 seconds
(normal operation).
￫
For UL-compliant installation and during operation, the mains
side switching devices must allow for a 1.25 times higher input
current.
￫
For the rated mains contactors for DC1 variable frequency
drives, please refer to
