2.10.5
Safe operation
During operation of the frequency inverter, always comply with the applicable national and
international regulations/laws on work on electrical equipment/plants.
Before commissioning and the start of the operation, make sure to fix all covers and check the
terminals. Check the additional monitoring and protective devices according to the applicable
national and international safety directives.
During operation, all covers must be installed correctly, and all electrical cabinet doors must be
closed. During operation, never open the machine/plant.
No connection work shall be carried out while power supply is on.
The machine/plant holds high voltage levels during operation, is equipped with rotating parts
(fan) and has hot surfaces. Any unauthorized removal of covers, improper use, wrong installation
or operation may result in serious injuries or material damage.
Some components, e.g. the heat sink or braking resistor, may be hot even some time after the
machine/plant was shut down. Don't touch any surfaces directly after shutdown. Wear safety
gloves where necessary.
The frequency inverter may hold dangerous voltage levels until the capacitor in the DC link is
discharged. After shutdown, wait for at least 3 minutes (sizes 1 through 7) before starting any
electrical or mechanical work on the frequency inverter. Even after this waiting time, make sure
that the equipment is deenergized in accordance with the safety rules before starting the work.
In order to avoid accidents or damage, only skilled personnel and electricians may carry out the
work such as installation, commissioning or setup.
In the case of a defect of terminals and/or cables, immediately disconnect the frequency inverter
from mains supply.
Persons not familiar with the operation of the frequency inverter and children must not have
access to the device.
Do not bypass nor decommission any protective devices.
The frequency inverter may be connected to power supply every 60 s. This must be considered
when operating a mains contactor in jog operation mode. For commissioning or after an
emergency stop, a non-recurrent, direct restart is permissible.
After a failure and restoration of the power supply, the motor may start unexpectedly if the
AutoStart function is activated.
If staff are endangered, a restart of the motor must be prevented by means of external circuitry.
Before commissioning and the start of the operation, make sure to fix all covers and check the
terminals. Check the additional monitoring and protective devices according to EN 60204 and
applicable the safety directives (e.g. Working Machines Act or Accident Prevention Directives).
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Operating Instructions ACU
21
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