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10. V/F control
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◆Slip compensation setting
Description: When motor load is larger, the motor slip is higher, in the meantime, the rotate speed
of motor axle will be reduced, and frequency command inconsistent. Slip compensation is slip were
brought by motor capacity and use increase output frequency to make actuality rotate frequency of
motor to close to frequency command. The compensation method is motor rated slip CE82 multiply
frequency CE00 and add to output frequency. Due to compensation demand motor rated slip CE82
that detected by autotuning or input by the specification on nameplate.
Slip (Hz)= rated frequency (Hz)- rated rpm (rpm)×pole/120
Setting precaution:
1. Slip compensation is invalid when set gain of CE00 to 0.
2. In the status of loading to measure motor speed and gradually adjust gain.
Increase gain when speed is too low, on the contrary to decrease gain.
3. Shrink delay time CE00 when the reaction of slip compensation is too low.
Increase delay time CE01 when speed is unstable.
◆Motor rated current
Description: Set motor overload protective current, in order to avoid motor failure because of overload.
Set value=100, please calculate the following formula:
Set Value = Motor rated current / Inverter rated current ×100
Ex. Use inverter with 3.7KW(5HP) to drive motor with 2.2KW(3HP)
Inverter rated current = 17.4A
Motor rated current = 8A
Set Value = 8 / 17.4 ×100 = 46%
Constant
No.
Constant name
Settable range
Factory setting
Change during
operation
CE00
Slip compensation gain
(FG only)
0 2.50 0 O
CE01
Slip compensation delay time
(FG only)
0 10000
500 ms
X
CE02
Restriction of Slip
compensation (FG only)
0 250 200
% X
Constant
No.
Constant name
Settable range
Factory setting
Change during
operation
Cd06
Motor rated current
10.0 200.0
100%
X