2 Engineering
2.4 Safety and switching
DC1-S…20…, DC1-S…OE1 Variable Frequency Drives
05/21 MN040058EN
www.eaton.com
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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 PowerXL
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