Slip Compensation - Mitsubishi Electric 800 Series Instruction Manual

(G) Control parameters
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.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.270 Stop-on contact/load torque high-speed frequency control selection
Pr.261 Power failure stop selection
Pr.350 Stop position command selection
5.16.13

Slip compensation

Slip of the motor is estimated from the inverter output current at the time of V/F control, and maintain the rotation of the
motor constant.
Pr. Name
245
Rated slip
G203
246 Slip compensation time
G204 constant
Constant-power range
247
slip compensation
G205
selection
• Slip compensation will become enabled by calculating the rated motor slip, and setting to Pr.245
Slip compensation is not performed when Pr.245 = "0, 9999".
Synchronized speed at the time of base frequency - rated rotation speed
Rated slip =
NOTE
• When the slip compensation is performed, the output frequency may become larger than the set frequency. Set Pr.1
Maximum frequency higher than the set frequency.
• Slip compensation will be disabled in following cases.
At the times of stall preventive (oL, OL) operation, regeneration avoidance operation, auto tuning, encoder feedback control
operation
Parameters referred to
Pr.1 Maximum frequency
Pr.3 Base frequency page 591
618
PARAMETERS
page 332
page 608
page 597
page 526
page 473
Initial
value
9999
0.5s
9999
Synchronized speed at the time of base frequency
page 329
page 515
page 463
V/F V/F V/F
Setting
range
0.01 to 50% Set the rated motor slip.
0, 9999 Without slip compensation
Set the response time of the slip compensation. Response
will become faster when the value is lowered, but the
0.01 to 10s
regenerative overvoltage (E.OV[]) error will occur more
frequently when the load inertia is larger.
Do not perform slip compensation at constant output range
0
(frequency range higher than the frequency set in Pr.3).
9999 Perform the slip compensation of the constant output range.
Description
 100[%]