Franklin Electric CERUS X-DRIVE CXD-003A-4V, Installation And Operation Manual

Page: 101 / 252

ADVANCED APPLICATION OPTIONS
Operation with Permanent Magnet Motors
101
Tune motor control - I/F Control
Related parameters:
•
I/F Current [Motor-24]: Percentage of nominal motor current
[SET-03]
used to regulate AC current
during I/F Control.
• Freq I/F to PM [Motor-27]: When increasing frequency, the frequency to switch modes from I/F mode
to PMSVC mode.
• Freq PM to I/F [Motor-28]: When decreasing frequency, the frequency to switch modes from PMSVC
mode to I/F mode.
• I/F Fltr Time [Motor-29]: Low-pass filter time of current being commanded from
I/F Current [Motor-24]
.
The drive regulates current level at I/F Current [Motor-24] as frequency ramps up to Freq I/F to PM [Motor-27] . Once
above this frequency, the Advance V/F Control becomes active. Ramping down to
Freq PM to I/F [Motor-28]
switches out of Advance V/F Control to I/F Current [Motor-24] regulation. The current regulation averages cur -
rent value base on
I/F fltr time [Motor-29]
.
If the motor load does not rotate up to Freq I/F to PM [Motor-27] , the I/F Current needs to increase. If the I/F Cur -
rent is at maximum without load rotating, reduce I/F current to below 100% and set acceleration rate to a
higher value. If more torque is required, increase
Carrier Frequency [SET-62] .
Tune motor control - PM Control
Related parameters:
•
Torque Filter T [Motor-15]: Response time in controlling torque to motor.
• Torque Cmp Gain [Motor-17]: Gain value for output voltage increase to compensate for voltage drop
on stator resistance at high motor loads in torque compensation function. For PM motors, max value is
5000. Setting this parameter to 0 will remove I/F control and disable stability.
• PM Bandwidth HS [Motor-25]: Allowable frequency bandwidth around desired frequency in order to
adjust operating frequency to prevent vibrations in motor operation.
• PMSVC Fltr Gain [Motor-26]: Gain value in adjusting the operating frequency from the desired fre -
quency to prevent vibrations in motor operation.
• PM Trq Comp I/F [Motor-37]: PM Torque Compensation in I/F Mode.
• PM Trq Comp SVC [Motor-38]: PM Torque Compensation in SVC Mode (Advance V/F Control).
IMPORTANT: PM Trq Comp I/F [Motor-37] and PM Trq Comp SVC [Motor-38] are only operable in FE MagForce applica -
tion. PM Motor Application uses
Torque Cmp Gain [Motor-17]
.
The drive outputs nominal voltage based on desired frequency. Frequency compensation (stabilizer) is
quickly adjusting the desired frequency to prevent overcurrent or high voltage on DC bus. The torque com
-
pensation control is adjusting output voltage to ensure rotor magnetization is at correct level for desired
torque with respect to operating frequency. The switching frequency should be increased by at least 1.5
times the resonant frequency of the sine filter.
PM motors can be unstable with no loads at high frequencies. If there is a light or no load, the
Torque Cmp Gain
[Motor-17] will need to be increased until stability is achieved. Increasing the switching frequency helps in
providing stability. If a more precise output frequency is desired, lower the
PM Bandwidth HS [Motor-25]
.