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176
Selection of operation mode and operation location
4.18.3 Start command source and frequency command source during communication
operation (Pr. 338, Pr. 339, Pr. 551)
(1) Selects the command source of the PU operation mode (Pr. 551)
Any of the operation panel, PU connector can be specified as the command source in the PU operation mode.
In the PU operation mode, set Pr. 551 to "2" when executing parameter write, start command or frequency command
during the RS-485 communication with PU connector.
PU...PU operation mode, NET...network operation mode, —...without command source
∗1 The Modbus-RTU protocol cannot be used in the PU operation mode. When using the Modbus-RTU protocol, set Pr. 551 ≠ "2".
∗2 When Pr. 551 = "9999", the priorities of the PU control source is parameter unit (FR-PU04/FR-PU07) > operation panel.
When the RS-485 communication with the PU connector is used, the external start command and frequency command
can be made valid. Command source in the PU operation mode can be selected.
From the communication device, parameter unit, etc. which have command source, parameter write or start command
can be executed. Parameter read or monitoring can be executed in any operation mode.
Parameter
Number
Name
Initial
Value
Setting
Range
Description
338
Communication operation
command source
0
0 Start command source communication
1 Start command source external
339
Communication speed
command source
0
0 Frequency command source communication
1 Frequency command source external
2
Frequency command source external (Frequency command from
communication is valid, frequency command from terminal 2 is
invalid)
551 ∗
PU mode operation
command source
selection
9999
2 PU connector is the command source when PU operation mode.
4 Operation panel is the command source when PU operation mode.
9999
Parameter unit automatic recognition
Normally, operation panel is the command source. When the
parameter unit is connected to the PU connector, PU is the
command source.
The above parameters can be set when Pr. 160 Extended function display selection = "0". (Refer to page 162)
* Pr. 551 is always write-enabled.
Pr. 551
Setting
Command Source
Remarks
Operation
panel
Parameter
unit
RS-485
communication
2— PUPU ∗1
Switching to NET operation mode
disabled
4PU — NET
9999
(initial value)
PU ∗2 PU ∗2 NET
NOTE
When performing the RS-485 communication with the PU connector when Pr. 551 = "9999", PU mode command
source does not automatically change to the PU connector.
When Pr. 551 = "2" (PU mode PU connector), the operation mode cannot be switched to the network operation mode.
Changed setting value is valid when powering on or resetting the inverter.
The Modbus-RTU protocol cannot be used in the PU operation mode. Select network operation mode (NET mode
command source).