Start Command Source And Freqency Command Source During Communication Operation (Pr. 338, Pr. 339, Pr. 550, Pr. 551) - Mitsubishi Electric FR-A760 Series Instruction Manual

4.23.3 Start command source and freqency command source during
communication operation (Pr. 338, Pr. 339, Pr. 550, Pr. 551)
When the RS-485 terminals or communication option is used, the external operation command and speed
command can be made valid. Command source in the PU operation mode can be selected.
Parameter
Name
Number
Communication operation
338
command source
Communication speed
339
command source
NET mode operation
command source
550 *
selection
PU mode operation
551 *
command source selection
The above parameters can be set whenever the communication option is connected. (Refer to page 296.)
* Pr 550 and Pr. 551 are always write-enabled.
(1) Select the command source of the network operation mode (Pr. 550)
⋅ Either the RS-485 terminals or communication option can be specified as the command source in the network operation
mode.
⋅ For example, set Pr. 550 to "1" when executing parameter write, start command or frequency command from the
inverter RS-485 terminals in the network operation mode independently of whether the communication option is
connected or not.
CAUTION
⋅ Since Pr. 550 = "9999" (automatic recognition of the communication option) in the initial setting, parameter write, start command
and frequency command cannot be executed by communication using the inverter RS-485 terminals when the communication
option is fitted. (Monitor and parameter read can be performed.)
(2) Select the control source of the PU operation mode (Pr. 551)
⋅ Any of the PU connector, RS-485 terminals, or USB connector can be specified as the source of control in the PU
operation mode.
⋅ In the PU operation mode, set Pr. 551 to "1" when executing parameter write, start command or frequency
command through communication from the unit RS-485 terminals. Set Pr. 551 to "3" for communication from the
USB connector.
CAUTION
⋅ The PU operation mode has a higher priority when Pr. 550 = "1" (NET mode RS-485 terminals) and Pr. 551 = "1" (PU mode RS-485 terminals).
When the communication option is not fitted, therefore, the operation mode cannot be switched to network operation mode.
⋅ Changed setting value is made valid when powering on or resetting the inverter.
Pr. 550 Pr. 551
Setting Setting
PU connector
×
1
2
(initial
0
PU operation mode
value)
×
3
×
1
1
2
(initial
PU operation mode
value)
×
3
×
1
2
(initial
PU operation mode
9999
value)
(initial
value)
×
3
*1 The Modbus-RTU protocol cannot be used in the PU operation mode. When using the Modbus-RTU protocol, set Pr. 551 to "2".
*2 When the communication option is not fitted, the operation mode cannot be switched to network operation mode.
Initial Setting
Value Range
0 Start command source communication
0
1 Start command source external
0 Frequency command source communication
1 Frequency command source external
0
Frequency command source external (Frequency command from
2
communication is valid, frequency command from terminal 2 is invalid)
The communication option is the command source when NET
0
operation mode.
1
RS-485 terminals are the command source when NET operation mode.
9999
Automatic communication option recognition
Normally, the RS-485 terminals are the command source. When a
9999
communication option is mounted, the communication option is the
command source.
1
RS-485 terminals are the command source when PU operation mode.
2 2 PU connector is the command source when PU operation mode.
3 USB connector is the command source when PU operation mode.
Operation Mode of Control Source
USB connector RS-485 terminals Communication option
×
PU operation mode
×
PU operation mode
×
PU operation mode
×
NET operation mode
PU operation mode NET operation mode
×
PU operation mode
×
NET operation mode
PU operation mode
NET operation mode
Selection of operation mode and operation location
Description
NET operation mode
*1
×
NET operation mode
×
NET operation mode
×
*1
×
×
NET operation mode
*1
×
NET operation mode
×
×
NET operation mode
×
Remarks
*2
*2
*2
Switching to NET
operation mode disabled
*2
Communication option fitted
*2
Communication option
not fitted
Communication option fitted
*2
Communication option
not fitted
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