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3. OPERATION
The operation of the inverter changes slightly when this option unit is
installed. These changes are described in the following paragraphs.
3.1 Operating Modes
In the PU operating mode, the inverter is controlled by a Parameter Unit
(FR-PU04) or operation panel.
In the External operating mode, the inverter is controlled by external
signals connected to the inverters terminal block.
In the Network (computer link) operating mode, the inverter is controlled by
commands from a PROFIBUS master.
3.2 Selecting the Operating Mode
The following table describes the actions required to change the operating
mode. The FR-A5NP option may be used to monitor all data in the inverter
in any operating mode. The inverter must, however, be in "Net Operation"
mode for network control to be enabled. Net Operation mode is active
when Pr.79=0 (factory default "normal mode") or when Pr.79=6
("switchover mode"). (For details of Pr. 79, refer to the inverter manual.)
Mode Change
Ext Operation ! PU Operation
PU Operation ! Ext Operation
Ext Operation ! Net Operation
Net Operation ! Ext Operation
Net Operation ! PU Operation
The following conditions must also be met before you can change the
operating mode:
• the inverter is stopped
• the forward and reverse commands are off
PNU 128h (IND=2) allows you to select the Network operating mode on
power-up and after a drive reset.
Once the Network operating mode is started, there must be PROFIBUS
activity at least once every 5s. If the option unit does not sense valid
PROFIBUS activity for 5s or more, it performs an option module alarm
stop, the inverter display unit shows "E.OP3", and you must reset the
inverter to clear this fault.
Action Required
Select the PU operation mode from the operation
panel or press PU key on the parameter unit.
Select the EXT operation mode from the operation
panel or press EXT key on the parameter unit.
PROFIBUS master writes 0014h to PNU 00Bh
(IND=0100h).
PROFIBUS master writes 0010h to PNU 00Bh
(IND=0100h)
PROFIBUS master writes 0011h to PNU 00Bh
(IND=0100h)
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