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82 to 84, 90, 96, 298
Offline auto tuning
Pr.82 Motor excitation current
Pr.84 Rated motor frequency
Pr.96 Auto tuning setting/status
When using motors under General-purpose magnetic flux vector
control, the offline auto tuning can be executed to automatically
calculate the motor constant.
When executing the offline auto tuning under V/F control, set the
motor constant (R1) and the Pr.298 Frequency search gain required
for the frequency search at the automatic restart after
instantaneous power failure.
Parameter
Setting
Number
Range
0
(initial
Offline auto tuning is not performed.
value)
Offline auto tuning for General-purpose
96
11
magnetic flux vector control (motor constant
(R1) only)
Offline auto tuning for V/F control (automatic
21
restart after instantaneous power failure (with
frequency search))
You can copy the offline auto tuning data (motor constants) to
another inverter with the PU (FR-PU07).
Even when motors (other manufacturer's motor, SF-JRC, etc.) other
than Mitsubishi standard motor (SF-JR 0.4kW or higher), high
efficiency motor (SF-HR 0.2kW or higher), and Mitsubishi constant-
torque motor (SF-JRCA 4P, SF-HRCA 0.4kW to 15kW) are used or
the wiring length is long (30m or more as a reference), using the
offline auto tuning function runs the motor with the optimum
operating characteristics.
The offline auto tuning conditions
A motor is connected.
The motor capacity is the same as or one rank lower than the
inverter capacity.
A high-slip motor, high-speed motor and special motor cannot be
tuned.
The maximum frequency is 120Hz.
As the motor may run slightly, fix the motor securely with a
mechanical brake or make sure that there will be no problem in
safety if the motor runs.
Special caution is required in vertical lift applications.
Note that tuning performance is unaffected even if the motor runs
slightly.
When setting parameters, refer to the instruction manual (applied) and understand instructions.
GP
GP
GP
V/F
V/F
V/F
MFVC
MFVC
MFVC
Pr.83 Rated motor voltage
Pr.90 Motor constant (R1)
Pr.298 Frequency search gain
Description
117 to 124, 342, 343, 502, 549, 779
Initial communication setting
Pr.117 PU communication station number
Pr.119 PU communication stop bit length
Pr.121 Number of PU communication retries
Pr.123 PU communication waiting time setting
Pr.342 Communication EEPROM write selection
Pr.343 Communication error count
Pr.502 Stop mode selection at communication error
Pr.549 Protocol selection
Pr.779 Operation frequency during communication error
(1) Initial settings and specifications for RS-485
communication (Pr.117 to Pr.124)
Used to perform required settings for RS-485 communication
between the inverter and personal computer.
There are two different communications: communication
using the PU connector of the inverter and communication
using the RS-485 terminals.
You can perform parameter setting, monitor, etc. using the
Mitsubishi inverter protocol or Modbus-RTU protocol.
To make communication between the personal computer
and
inverter,
initialization
specifications must be made to the inverter.
Data communication cannot be made if the initial settings
are not made or there is any setting error.
Pr.
Setting Range
Number
Specify the inverter station number.
0 to 31
Set the inverter station numbers when
117
two or more inverters are connected to
(0 to 247)
one personal computer
Set the communication speed.
The setting value 100 equals the
118
48, 96, 192, 384
communication speed.
For example, the communication speed is
19200bps when the setting value is "192".
Stop bit length
0
119
1 (initial value)
10
11
0
Without parity check
120
1
With odd parity check
2 (initial value)
With even parity check
Set the permissible number of retries at
occurrence of a data receive error. If the
0 to 10
number of consecutive errors exceeds
the permissible value, the inverter will
121
come to trip.
If a communication error occurs, the
9999
inverter will not come to trip.
RS-485 communication can be made.
Note that a communication fault (E.PUE)
occurs as soon as the inverter is
0 (initial value)
switched to the operation mode with
command source. (NET operation mode
at initial value)
122
Set the interval of communication check
time.
0.1 to 999.8s
If a no-communication state persists for
longer than the permissible time, the
inverter will come to trip.
9999
No communication check
Set the waiting time between data
0 to 150ms
transmission to the inverter and
123
response.
9999 (initial value)
Set with communication data.
0
Without CR/LF
124
1 (initial value)
With CR
2
With CR/LF
When making communication via the Modbus-RTU protocol (Pr.549 =
"1"), the setting range is as indicated in parentheses.
Pr.118 PU communication speed
Pr.120 PU communication parity check
Pr.122 PU communication check time interval
Pr.124 PU communication CR/LF selection
of
the
communication
Description
Data length
1 bit
8 bits
2 bits
1 bit
7 bits
2 bits
42
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