Mitsubishi Electric 800 Series Instruction Manual (Function page 493

17.10
Increased magnetic excitation deceleration
V/F V/F V/F Magnetic flux Sensorless Sensorless Sensorless Vector
Magnetic flux Magnetic flux
Increase the loss in the motor by increasing the magnetic flux during deceleration. The deceleration time can be reduced by
suppressing the stall prevention (overvoltage) (oL).
The deceleration time can further be shortened without a brake resistor. (When a brake resistor is used, the duty can be
reduced.)
Pr.
Increased magnetic
660
excitation deceleration
G130
operation selection
661 Magnetic excitation
G131 increase rate
662 Increased magnetic
G132 excitation current level
 Setting of increased magnetic excitation rate (Pr.660, Pr.661)
• To enable the increased magnetic excitation deceleration, set Pr.660 Increased magnetic excitation deceleration
operation selection = "1".
• Set the amount of excitation increase in Pr.661 Magnetic excitation increase rate.
• Increased magnetic excitation deceleration will be disabled when Pr.661 = "0". When "8888 or 9999" is not set in Pr.19
under V/F control, increased magnetic excitation deceleration will be enabled even when Pr.661 = "0".
• When the DC bus voltage exceeds the increased magnetic excitation deceleration operation level during the deceleration,
excitation is increased in accordance with the setting value in Pr.661.
• The increased magnetic excitation deceleration will continue even if the DC bus voltage goes under the increased
magnetic excitation deceleration operation level during increased magnetic excitation deceleration.
Inverter
200 V class
400 V class
575 V class
• When the stall prevention (overvoltage) occurs during the increased magnetic excitation deceleration operation, increase
the deceleration time or raise the setting value of Pr.661. When the stall prevention (overcurrent) occurs, increase the
deceleration time or lower the setting value of Pr.661.
• Increased magnetic excitation deceleration is enabled under V/F control, Advanced magnetic flux vector control, Real
sensorless vector control (speed control), and Vector control (speed control).
NOTE
• Increased magnetic excitation deceleration will be disabled in the following conditions:
During PM sensorless vector control, automatic restart after instantaneous power failure, power failure stop, Optimum
excitation control, and stop-on-contact control.
 Overcurrent prevention function (Pr.662)
• The overcurrent prevention function is enabled under V/F control and Advanced magnetic flux vector control.
• The increased magnetic excitation rate is lowered automatically when the output current exceeds the level set in Pr.662
during increased magnetic excitation deceleration.
• When the inverter protective function (E.OC[], E.THT) is activated due to increased magnetic excitation deceleration,
adjust the level set in Pr.662.
492
17. (G) Control Parameters
17.10 Increased magnetic excitation deceleration
Vector Vector
Name Initial value
0
9999
100%
Increased magnetic excitation
deceleration operation level
340 V
680 V
850 V
Setting
range
0 Without the increased magnetic excitation deceleration function
1 With the increased magnetic excitation deceleration function
0% to 40% Set the increase of excitation.
The magnetic excitation increase rate is 10% under V/F control and
Advanced magnetic flux vector control.
9999
The magnetic excitation increase rate is 0% under Real sensorless
vector control and Vector control.
The increased magnetic excitation rate is automatically lowered
0% to 200% when the output current exceeds the setting value during increased
magnetic excitation deceleration.
Description