DYNACO USA 3 ● Safety regulations
Slimline Series RevB.doc THE SAFEST CHOICE 7
- Removal of safety equipment
- Maintenance or cleaning of the door
- Opening the control box
- Maintenance or repairs of the operating controls
- Other work that may be dangerous
3.2.5 Precautions with the frequency inverter
The frequency inverter
• When a frequency inverter has power supplied to it, the electrical elements and a number of
operating controls are also 'live'. Never touch these elements. This is extremely dangerous. The
cover of the frequency inverter must always be closed.
• When the emergency stop is activated, the frequency inverter remains 'live'. If this is a threat to
the safety of the staff, the power circuit must be interrupted by locking the main switch on the
control box.
• After locking the main switch, it is always necessary to wait 5 minutes
before starting work.
This is the time required to discharge the capacitors of the frequency inverter.
• The frequency inverter has integrated safety systems for stopping the door. A mechanical block,
fluctuations in voltage and interruptions of the power supply, can also bring the door to a stop.
This is shown with a fault message on the frequency inverter screen. After locking the main
switch, and having removed the blockage, the main switch has to be unlocked and the door
opened manually to re-charge the frequency inverter.
• In the event of work (on the electrical and/or mechanical part of the installation), the power supply
to the frequency inverter must be switched off; to do this, the main switch on the control box must
be locked.
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