Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual page 685
Fr-a800 series
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- Instruction manual (1218 pages) ,
- Instruction manual (36 pages) ,
- Instruction manual (106 pages)
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• Inverter output voltage shutoff timing when Pr.850 = "2"
Normal operation
Start command
(STF, STR)
Speed command
(rotation per
second)
Pr. 10 DC injection
brake operation
frequency
Magnetic flux decaying
Output voltage
RUN
RY2
Mechanical brake
MC on the output side
*1
Maximum processing time of the magnetic flux decay
• Tuning ON the Magnetic flux decay output shutoff (X74) signal starts the magnetic flux decay output shutoff regardless of
the Pr.850 setting. For the X74 signal, set "74" in any of Pr.178 to 189 (Input terminal function selection) to assign the
function.
• Inverter output shutoff timing with X74 signal
X74 signal
X74
Output voltage
RUN
Mechanical brake
MC on the output side
*1
Maximum processing time of the magnetic flux decay
• Since the torque will decrease at the time of magnetic flux decay output shutoff, set up so the mechanical brake will
operate.
• The magnetic flux decay output shutoff will be canceled at the time of restart and when the Pre-excitation/servo ON (LX)
signal or External DC injection brake operation start (X13) signal is turned ON.
• If an MC is installed at the inverter's output side, set to open the MC after the operation time of the magnetic flux decay
output shutoff elapses. (See below.)
Motor capacity (Pr.80 setting)
Magnetic flux decay process time
684
5. PARAMETERS
5.16 (G) Control parameters
ON
Magnetic flux decay
processing time∗
ON
ON
ON
ON
ON
Do not turn OFF MC
during this period
ON
Magnetic flux decay
processing time∗
Output voltage
ON
ON
ON
Mechanical brake
ON
MC on the output side
Do not turn off MC
during this processing time
2.2 kW or lower
250 ms
During brake sequence
Start command
(STF, STR)
Speed command
(rotation per
minute)
Pr. 13 Starting
frequency or 0.5Hz
(whichever is lower)
Magnetic flux decaying
Output voltage
Mechanical brake
MC on the output side
MRS signal
MRS
ON
ON
RUN
ON
ON
ON
3.7 kW to 11 kW
15 kW to 30 kW
500 ms
800 ms
ON
Magnetic flux
decay
processing time*
ON
RUN
ON
RY2
ON
ON
ON
Do not turn OFF MC
during this period
37 kW to 55 kW
75 kW or higher
900 ms
1100 ms
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Troubleshooting
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