Mitsubishi Electric FR-A800 Series Instruction Manual page 699

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NOTE
• When a 32-bit parameter setting or monitor item is read and the value to be read exceeds HFFFF, HFFFF is returned.
 Pr.343 Communication error count
• The communication error occurrence count can be checked.
Parameter
343
NOTE
• The communication error count is temporarily stored in the RAM memory. The value is not stored in EEPROM, and so is
cleared to 0 when power is reset and the inverter is reset.
 Alarm (LF) signal output (communication error warning)
• During a communication error, the Alarm (LF) signal is output by open collector output. Assign the terminal to be used using
any of Pr.190 to Pr.196 (Output terminal function selection).
Master
Slave
Communication
error count
(Pr. 343)
Signal LF
NOTE
• The LF signal can be assigned to an output terminal by setting Pr.190 to Pr.196. Changing the terminal assignment may affect
other functions. Set parameters after confirming the function of each terminal.
 Signal loss detection (Pr.539 RS-485 communication check time interval)
• If a signal loss (communication) is detected between the inverter and the master as a result of a signal loss detection, the
Communication fault (inverter) (E.SER) occurs and the inverter output is shut off.
• When the setting is "9999", communication check (signal loss detection) is not made.
• When the setting is "0", reading, etc. of monitors and parameters is possible, though E.SER occurs instantly when the
operation mode is switched to the Network operation.
698
5. PARAMETERS
5.15 (N) Communication operation parameters
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Definition
Model (1st and 2nd characters)
Model (3rd and 4th characters)
Model (5th and 6th characters)
Model (7th and 8th characters)
Model (9th and 10th characters)
Model (11th and 12th characters)
Model (13th and 14th characters)
Model (15th and 16th characters)
Model (17th and 18th characters)
Model (19th and 20th characters)
Capacity (1st and 2nd characters) Read
Capacity (3rd and 4th characters)
Capacity (5th and 6th characters)
Setting range
(Read-only)
Alarm data Alarm data
Not increased
0
OFF
ON
Communication error count is increased in
synchronization with leading edge of LF signal
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Read/write
Read
Read
Read
Read
The inverter model can be read in ASCII code.
Read
"H20" (blank code) is set for blank area.
Example) FR-A840-1 (FM type):
Read
H46, H52, H2D, H41, H38, H34, H30, H2D, H31, H20......H20
Read
Read
Read
Read
The capacity in the inverter model can be read in ASCII code.
Data is read in increments of 0.1 kW, and rounds down to 0.01
Read
kW increments.
"H20" (blank code) is set for blank area.
Read
Example) 0.75K: " 7" (H20, H20, H20, H20, H20, H37)
Minimum setting range
1
Normal data Alarm data
Reply data
1
OFF
Turns off when normal data is received
Alarm data :
Remarks
Initial value
0
Normal data
Reply data
2
OFF
ON
Data resulting in
communication error.