Mitsubishi Electric 800 Series Instruction Manual page 563

5.13.12 Increased magnetic excitation deceleration
V/F V/F V/F Magnetic flux Magnetic flux Magnetic flux
Increase the loss in the motor by increasing the magnetic flux at the time of deceleration. Deceleration time can be reduced by
suppressing the stall prevention (overvoltage) (oL).
It will make possible to reduce the deceleration time without a brake resistor.
Pr.
660 Increased magnetic excitation
G130 deceleration operation selection
661 Magnetic excitation increase rate 9999
G131
662 Increased magnetic excitation
G132 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 (850 V) during increased magnetic excitation deceleration.
• 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 with V/F control, Advanced magnetic flux vector control.
NOTE
• The increased magnetic excitation deceleration will be disabled in the following conditions:
During PM motor control, power failure stop, energy saving operation, Optimum excitation control.
 Overcurrent prevention function (Pr.662)
• The overcurrent prevention function is valid under V/F control and Advanced magnetic flux vector control.
• Increased magnetic excitation rate is lowered automatically when the output current exceeds Pr.662 at the time of
increased magnetic excitation deceleration.
• When the inverter protective function (E.OC[], E.THT) operates due to increased magnetic excitation deceleration, adjust
with Pr.662.
• Overcurrent preventive function will be disabled when Pr.662= "0".
NOTE
• When set to Pr.662 > Pr.22 Stall prevention operation level, overcurrent preventive function will operate at the setting
value of Pr.22. (Operates at Pr.622 when Pr.22 = "0")
Parameters referred to
Pr.19 Stall prevention operation level
Pr.22 Stall prevention operation level
Pr.30 Regenerative function selection
Pr.60 Energy saving control selection
Pr.162 Automatic restart after instantaneous power failure selection
Pr.261 Power failure stop selection
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5. PARAMETERS
5.13 (G) Control parameters
Name Initial value
0
100%
page 539
page 257
page 553
page 543
page 458
Setting range
0 Without increased magnetic excitation deceleration
1 With increased magnetic excitation deceleration
0 to 40% Set the increase of excitation.
9999 Magnetic excitation increase rate 10%
0 to 300% The increased magnetic excitation rate is automatically
lowered when the output current exceeds the setting value
at the time of increased magnetic excitation deceleration.
page 448
Description