Invertek optidrive cp2 User Manual page 19

Par. Name
P6-30 Advanced Parameter Access Code Definition
Defines the access code which must be entered into P1-14 to allow access to the Advanced Parameters.
1.3.7. Parameter Group 7 – Motor Data
The following parameters are used internally by the drive to provide optimum possible motor control. Incorrect setting of the
parameters can result in poor performance and unexpected behaviour of the motor. Adjustments should only be carried out by
experienced users who fully understand the functions of the parameters.
Par. Name
P7-01 Motor Stator Resistance (Rs)
Motor stator resistance value measured during the autotune.
P7-02 Motor Rotor Resistance (Rr)
For induction motors: phase to phase rotor resistance value in ohms.
P7-03 Motor Stator Inductance (Lsd)
For induction motors: phase stator inductance value.
For permanent magnet motors: phase d-axis stator inductance in Henry (H).
P7-04 Motor Magnetising Current (Id rms)
For induction motors: magnetizing / no load current. Before Auto-tune, this value is approximated to 60% of motor rated current (P1-
08), assuming a motor power factor of 0.8.
P7-05 Motor Leakage Coefficient (Sigma)
For induction motors: motor leakage inductance coefficient
P7-06 Motor Stator Inductance : PM Motors (Lsq)
For permanent magnet motors: phase d-axis stator inductance in Henry (H).
P7-07 Enhanced Generator Mode
Valid in vector control mode only, provides improved performance and control of the motor when operating in regenerative mode at
low speed.
P7-08 Motor Parameter Adaptation Enable
0 : Disabled
1 : Enabled. For Induction motors only and effective in vector control mode (P4-01 = 0 or 1), allows the stator resistance to be adapted
during normal operation to compensate for increase in the moror temperature.
P7-09 Over Voltage Current Limit
Effective in vector speed control mode only, and will come into function once the drive DC bus voltage increases above a preset limit.
This voltage limit is set internally just below the over voltage trip level. This parameter will effectively limit the output torque current
in order to prevent a large current flowing back to the drive, which may cause an Over-voltage trip. A small value in this parameter will
limit the motor control torque when the drive DC bus voltage exceeds the preset limit. A higher value may cause a significant
distortion in the motor current, which may cause an aggressive, rough motor behaviour.
P7-10 System Inertia Constant
System Load Inertia to Motor Inertia Ratio entered as H = (JTot / JMot). This value can normally be left at the default value (10) and is
used by the drive control algorithms as a feed-forward control variable to provide optimum torque current to accelerate the load.
Hence accurate setting of the inertia ratio will produce a better system response and dynamic behaviour.
P7-11 Pulse Width Minimum Limit
This parameter is used to limit the minimum output pulse width, which can be used for long motor cable applications. Increasing the
value of this parameter will reduce the risk of over-current trips, but will also reduce the maximum available output motor voltage.
P7-12 V/F Mode / PM Mode Magnetising Period
Defines the delay time between the output stage enabling at 0.0Hz prior to the output frequency beginning to ramp to accelerate the
motor. In V/F mode, this allows time for the motor to correctly magnetise, and avoids possible over current trips that may occur if the
output frequency begins to ramp before the motor flux has stabilised.
In IM vector mode, this function is automatically handled through the vector control algorithm.
In PM and BLDC modes, this time is again used, and provides the same function, allowing alignment of the rotor flux prior to
accelerating the motor, and again can help avoid over current trips.
P7-13 Vector Speed Control Derivative Gain
Sets the differential gain (%) for the speed controller in vector mode operation.
P7-14 Low Frequency Torque Boost
Effective in all motor control modes, except V/F mode (P4-01 = 2), but primarily intended for use with synchronous motors.
Allows a boost current to be applied at start-up and low frequency (limit defined by P7-15), as a percentage of the motor rated current
(P1-08). Injecting some additional current into the motor at low speed helps to ensure that the rotor alignment is maintained,
imrpoving operation of the motor at lower speeds.
In order to determine the correct setting, run the drive at the lowest frequency required by the application and increase boost levels
to provide both required torque and smooth operation whilst avoiding excessive current levels which may cause nuisance tripping.
P7-15 Torque Boost Frequency Limit
Frequency range for applied boost current (P7-14) as a % of motor rated frequency (P1-09). This sets the frequency cut-off point above
which boost current is no longer applied to the motor.
Optidrive P2 Advanced User Guide Rev 2.00
Minimum
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Maximum Default
9999 201
Maximum Default
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1 0
100.0 5.0
600 10
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100.0 0.0
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