Mitsubishi Electric FR-E800 Series Instruction Manual page 438

• 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 ON
RY2
Mechanical brake
MC on the output side
*1 Maximum processing time of the magnetic flux decay
• Turning 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 Pr.189 (Input terminal function selection) to assign
the function.
• Inverter output shutoff timing with X74 signal
X74 signal
X74
ON
Output voltage
ON
RUN ON
Mechanical brake ON
MC on the output side
ON
*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 (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
ON
Magnetic flux decay
processing time∗
ON
ON
ON
ON
Do not turn OFF MC
during this period
MRS signal
Magnetic flux decay
processing time∗
Output voltage
Mechanical brake
MC on the output side
Do not turn off MC
during this processing time
2.2 kW or lower 3.7 kW to 11 kW
250 ms 500 ms
16.6 DC injection brake, zero speed control, servo lock, and magnetic flux decay output shutoff
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
RUN
RY2
Mechanical brake
MC on the output side
MRS
ON
ON
RUN ON
ON
ON
15 kW to 30 kW
800 ms
ON
Magnetic flux
decay
processing time*
ON
ON
ON
ON
ON
Do not turn OFF MC
during this period
16. (G) Control Parameters
11
12
13
14
15
16
17
18
19
20
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