10/05 AWB8230-1541GB
49
4Using the DF51
This section describes how to take the DF51 frequency inverter
into operation and what you should observe during its operation.
Operational warnings
Danger!
If the supply voltage recovers after an intermittent
failure, the motor may restart automatically if a start
signal is still present. If personnel is endangered as a
result, an external circuit must be provided which
excludes a restart after voltage recovery.
Danger!
If the frequency inverter has been configured so that the
stop signal is not issued through the OFF key on the LCD
keypad, pressing the OFF key will not switch off the
motor. A separate Emergency-Stop switch must be
provided in this case.
Danger!
Maintenance and inspection of the frequency inverter
may only be undertaken at least 5 minutes after the
supply voltage has been switched off. Failure to observe
this point can result in electric shock as a result of the high
voltages involved.
Danger!
Never pull on the cable to unplug connectors (for example
for fan or circuit boards).
Warning!
If a reset is carried out after a fault, the motor will start
again at once automatically if a start signal is applied
simultaneously. To avoid the risk of serious or fatal injury
to personnel, you must ensure that the start signal is not
present before acknowledging a fault message with a
reset.
Warning!
When the supply voltage for the frequency inverter is
applied while the start signal is active, the motor will
start immediately. Make sure that the start signal is not
active before the supply voltage is switched on.
Warning!
Do not connect or disconnect cables or connectors during
operation while the supply voltage is switched on.
Caution!
To prevent a risk of serious or fatal injury to personnel,
never interrupt the operation of the motor by opening the
contactors installed on the primary or secondary side.
h
The Start key is functional only if the corresponding
parameters of the frequency inverter have been
configured accordingly (a section “Start signal
input”page 77 This prevents the risk of damage and
injury.
h
If motors are to be operated at frequencies above the
standard 50 or 60 Hz, consult the motor manufacturer
to make sure that the motors are suitable for operation
at higher frequencies. The motors could otherwise incur
damage.
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