Start Command Source And Frequency Command Source During Communication Operation (Pr. 338, Pr. 339, Pr. 551) - Mitsubishi Electric FR-D720-0.4K Instruction Manual

4.18.3 Start command source and frequency command source during communication
operation (Pr. 338, Pr. 339, Pr. 551)
When the RS-485 communication with the PU connector is used, the external start command and frequency command
can be 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 performed in any operation mode.
Parameter
Name
Number
Communication operation
338
command source
Communication speed
339
command source
PU mode operation
551 ∗
command source
selection
The above parameters can be set when Pr. 160 Extended function display selection = "0". (Refer to page 163)
* This parameter allows its setting to be changed in any operation mode even if "0 (initial value) or 1" is set in Pr. 77 Parameter write selection.
(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
Command Source
Pr. 551
Operation
Setting
panel
2 —
4 PU
9999
PU ∗2
(initial value)
∗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.
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).
All of the operation mode indicators (
not operation panel.
Selection of operation mode and operation location
Initial Setting
Value Range
0
0
1
0
1
0
2
2
4
9999
9999
Parameter RS-485
unit communication
PU ∗1
PU
— NET
PU ∗2
NET
Description
Start command source communication
Start command source external
Frequency command source communication
Frequency command source external
Frequency command source external (Frequency command from
communication is valid, frequency command from terminal 2 is
invalid)
PU connector is the command source when PU operation mode.
Operation panel is the command source when PU operation mode.
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.
Remarks
Switching to NET operation mode
disabled
) on the operation panel turn OFF when the command source is
4
175