Mitsubishi Electric FR-F800 Series Instruction Manual page 576

• 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
With 500 V input
• 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 and Advanced magnetic flux vector control.
NOTE
• Increased magnetic excitation deceleration will be disabled in the following conditions:
PM motor control, power failure stop, operation with the FR-HC2, FR-XC (common bus regeneration mode), or FR-CV, energy
saving operation, and Optimum excitation 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.
• The overcurrent preventive function is disabled when Pr.662 = "0".
NOTE
• When the level set in Pr.662 is more than the one set in Pr.22 Stall prevention operation level, the overcurrent preventive
function is activated at the level set in Pr.22. (The level set in Pr.662 is applied when Pr.22 = "0".)
Parameters referred to
Pr.22 Stall prevention operation
Pr.30 Regenerative function
Pr.60 Energy saving control
Pr.162 Automatic restart after instantaneous power failure
Pr.261 Power failure stop
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Increased magnetic
excitation deceleration
operation level
340 V
680 V
740 V
levelpage 290
selectionpage 566
selectionpage 557
selectionpage 478
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selectionpage 466, page 472
575
5. PARAMETERS
5.13 (G) Control parameters
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