60
(49) PID Integral Upper Bound
(Cn-55)
(50) PID Primary Delay Time Constant
(Cn-56)
•
Please refer to Fig. 14
“
Block diagram for PID control in inverter
”
•
The parameter Cn-55 prevents the calculated value of the integral control of PID
from exceeding the fixed amount. The value is limited within 0-109% of Max.
output frequency (100%). Increase Cn-55 will improve the integral control. If
hunting cannot be reduced by decreasing the Bn-18 or increasing Cn-56, Cn-55
has to decrease. If the setting of Cn-55 is too small, the output may not match the
target setting.
•
The parameter Cn-56 is the low-pass filter setting for PID control output. If the
viscous friction of the mechanical system is high, or if the rigidity is low, causing
the mechanical system to oscillate, increase the setting Cn-56 so that it is higher
than the oscillation period. It will decrease the responsiveness, but it will prevent
the oscillation.
(51) Motor Line-to-Line Resistance R1
(Cn-57)
•
Set the motor’s terminal resistance (including the motor external cable resistance)
in
Ω
unit.
•
The default setting depends upon the type of inverter (but do not include the motor
external motor cable resistance).
•
This value will be automatically set during autotuning. See “Motor parameter
autotuning selection” on page 100.
•
Increase the setting when the generating torque is not large enough at low speed.
•
Decrease the setting when the generating torque is extremely high and cause
overcurrent trip at low speed.
(52) Motor Rotor Equivalent Resistance R2
(Cn-58)
•
Set the motor’s rotor Y-equivalent model resistance in
Ω
unit.
•
The default setting depends upon the type of inverter. Normally this value isn’t
shown on the motor’s nameplate, so it might be necessary to contact motor
manufactor.
•
This value will be automatically set during autotuning. See “Motor parameter
autotuning selection” on page 100.
(53) Motor Leakage Inductance Ls
(Cn-59)
•
Set the motor’s rotor Y-equivalent model leakage inductance in mH unit.
•
The default setting depends upon the type of inverter.
•
This value will be automatically set during autotuning. See “Motor parameter
autotuning selection” on page 100.
Summary of Contents for speecon 7200ma
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