Mitsubishi Electric FR-A800 Series Instruction Manual page 719

• 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
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
718
5. PARAMETERS
5.16 (G) Control parameters
Downloaded from ManualsNet.com
ON
Magnetic flux decay
processing time*1
ON
RUN ON
RY2 ON
ON
ON
Do not turn OFF MC
during this period
ON
Magnetic flux decay
processing time*1
ON
ON
ON
ON MC on the output side
Do not turn off MC
during this processing time
2.2 kW or lower
250 ms
search engine
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
Output voltage
ON
RUN ON
Mechanical brake
ON
3.7 kW to 11 kW 15 kW to 30 kW
500 ms 800 ms
ON
ON
RUN ON
RY2 ON
ON
ON
Do not turn OFF MC
during this period
ON
37 kW to 55 kW
900 ms
Magnetic flux
decay
processing time*1
75 kW or higher
1100 ms