Increased Magnetic Excitation Deceleration - Mitsubishi Electric 800 Series Instruction Manual

5.16.12

Increased magnetic excitation deceleration

V/F V/F V/F
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. (Usage can be reduced if a brake resistor
is used)
Pr. Name
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 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, Real
sensorless vector control (speed control), and vector control (speed control).
NOTE
• The increased magnetic excitation deceleration will be disabled in the following conditions:
During PM sensorless vector control, power failure stop, orientation control, energy saving operation, Optimum excitation
control, and stop-on-contact control.
Magnetic flux Sensorless Magnetic flux Magnetic flux Sensorless Vector Sensorless Vector Vector
Initial
value
0
0
1
0 to 40%
9999
9999
100% 0 to 300%
Setting
range
Without increased magnetic excitation deceleration
With increased magnetic excitation deceleration
Set the increase of excitation.
Magnetic excitation increase rate 10% under V/F control and
Advanced magnetic flux vector control
Magnetic excitation increase rate 0% under Real sensorless
vector control and vector control
The increased magnetic excitation rate is automatically
lowered when the output current exceeds the setting value at
the time of increased magnetic excitation deceleration.
(G) Control parameters
Description
PARAMETERS
5
GROUP
G
617