The components of the power section and specific elements of the control section are connected
to the voltage mains when the inverter is connected to the mains voltage.
Touching these components involves mortal danger!
Isolate the inverter from the mains before removing the front panel or the housing (e.g. by removing
or deactivating on-site fuses or by deactivating a master switch isolating all poles etc.).
After switching off the mains voltage, wait for at least 5 minutes before beginning work on or in
the inverter (the DC voltage in the DC link capacitors must first of all discharge through discharge
resistors). DC voltages of up to 800 V are possible. In the event of malfunctions, the discharge
time of 5 minutes may be exceeded substantially.
The inverter contains protective facilities that deactivate it in the event of malfunctions, as the result
of which the motor is de-energized and comes to a standstill (so-called ‘‘coasting’’ of the motor is
possible depending on the flywheel or the type of drive involved). Standstill of the motor can,
however, also be produced by mechanical blockage. Voltage fluctuations, and particularly mains
power failures may also lead to deactivation. In certain circumstances the drive may start up
automatically once the cause of the fault has been remedied. As the result of this, certain systems
may be damaged or destroyed and there may be a risk for operators working on the system. For
such operating cases, the user must take precautions to reliably prevent automatic starting
of the motor. For example, this can be done by using a speed monitor that deactivates the power
supply to the inverter if the motor should come to an unscheduled standstill.
The motor may stop during operation due to a disabling protection circuit operation or by loss of
the control signal. Resetting these systems can result in the motor restarting. If automatic starting
of the motor must be prevented to protect operating personnel, interlocks must be provided to isolate
the mains supply to the inverter.
The inverter must always be earthed when operated.
Measuring instruments must only be connected and disconnected after removing the power supply.
The responsible operating personnel must read, understand and observe the instruction manual.
We draw attention to the fact that no liability can be assumed for damage and malfunctions resulting
from failure to observe the instruction manual.
Technical data and illustrations given in this operating manual may be amended to comply with
modifications of the units which may be made to improve their functions.
BERGES electronic
4 Operating manual ACM-D2 29.05.98
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