2 Engineering
2.4 Safety and switching
DC1-S…20…, DC1-S…OE1 Variable Frequency Drives
05/21 MN040058EN
www.eaton.com
33
2.4.4 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-S… 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-S… 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-S… variable frequency
drives, please refer to
Summary of Contents for DC1-S1011NB-A20CE1 1
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