BENSHAW RSi H2 Series - Page 264

Sensorless Vector Control
252
890053-00-02
Speed Search Setting Details
Code
Description
CON-69 SS Pulse Curr
Sets the speed search current based on the motor’s rated current.
CON-70 SS Mode
2: Flying Start-3
This speed search is available when operating a PM synchronous motor. It is used when
DRV-09 (Control Mode) is set to 4 (PM Sensorless).
CON-71 Speed Search
Refer to 5.5.3 CON-70 Speed Search Operation on pg.156 for details on bit settings.
CON-75 SS Block Time
This setting helps prevent overvoltage faults due to counter electromotive force.
Guidelines for Running a PM Synchronous Motor in Sensorless Vector Control Mode
Problem
Relevant function code
Troubleshooting
Starting torque is insufficient.
CON-48 ACR P-Gain
CON-47 PMdeadVolt
Per
If an overcurrent trip occurs at startup, try
decreasing the value at CON-48 in 10%
decrements.
Try increasing the value at CON-47 in 10%
increments.
The motor hunts when starting
up.
CON-47 PMdeadVolt
Per
Try decreasing the value at CON-47 in 10%
decrements.
The motor hunts with
regenerative load at low speed
(10Hz or lower), or an “OCT”
fault occurs.
CON-47 PMdeadVolt
Per
Try increasing the value at CON-47 in 10%
increments.
The motor hunts* or the torque is
not sufficient while the load is
increasing at low speed (10Hz or
lower).
CON-04 Carrier Freq
CON-34 ASR P Gain 1
CON-35 ASR I Gain 1
If the motor hunts at low speeds, try increasing
the value at CON-35 in 50 msec increments. If
the motor does not hunt, try increasing the
value at CON-34 in 10% increments until the
motor runs in an optimal operation condition.
If the motor hunts and the torque is not
sufficient at 5–10Hz speed range, and if the
carrier frequency at CON-04 is set to more
than 3 kHz, try decreasing the value in 1 kHz
decrements.
The motor hunts excessively
during no-load operation when
rated current is supplied to the
motor.
CON-34 ASR P Gain 1
CON-35 ASR I Gain 1
CON-36 ASR P Gain 2
CON-37 ASR I Gain 2
Try decreasing the speed controller gains at
CON-34–37 in 30% decrements.
The value at MOT-19 (PM Flux
Ref) becomes “0” after
performing an auto tuning
operation by setting MOT-11 to 6
[All (PM)].
MOT-03 Pole Number
MOT-07 Rated Volt
MOT-02 Base Freq
Refer to the motor’s name plate and set the
pole number at MOT-03 (Pole Number), or
enter a calculated pole number: Pole Number =
(120 x BaseFreq/BaseRPM)
Refer to the motor’s name plate and set the
rated voltage MOT-07 and base frequency
MOT-02 and then run auto tuning again by
setting MOT-110 (Auto Tuning) to 6 All (PM).
Faults occur after a static auto
tuning.
MOT-16 Rs
MOT-17 Ld (PM)
MOT-18 Lq (PM)
MOT-19 PM Flux Ref
Motor operation may fail if a static PM auto
tuning result is not accurate. Refer to the
motor’s name plate and set the motor-related
parameters again.
“OVT” occurs due to abrupt
acceleration, deceleration, or
massive load change while the
CON-37 ASR I Gain 2
Try decreasing the value at CON-37 in 5%
decrements.