Operation Command Source And Speed Command Source During Communication Operation (Pr. 338, Pr. 339, Pr. 550, Pr. 551) - Mitsubishi Electric FR-A740-00023 Instruction Manual

Selection of operation mode and operation location
4.23.3 Operation command source and speed 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. Also, the control 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 299.)
* Pr 550 and Pr. 551 are always write-enabled.
(1) Select the control source of the network operation mode (Pr. 550)
⋅ Either the RS-485 terminals or communication option can be specified as the source of control in network operation mode.
⋅ For example, set Pr. 550 to "1" when executing parameter write, start command or frequency setting 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 setting 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 setting
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.
310
Initial Setting
Value Range
0 Operation command source communication
0
1
Operation command source external
0
Speed command source communication
Speed command source external (Frequency setting from
1
0
communication is invalid, terminal 2 and 1 setting from external is valid)
Speed command source external (Frequency setting from
2
communication is valid, terminal 2 and 1 setting from external is invalid)
0
Communication option valid
1 RS-485 terminals valid
9999
Automatic recognition of the communication option
9999 Normally, the RS-485 terminals are valid. When the communication
option is fitted, the communication option is valid.
1 Select the RS-485 terminals as the PU operation mode control source.
2 2 Select the PU connector as the PU operation mode control source.
3
Select the USB connector as the PU operation mode control source.
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
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