Delta CT2000 Series User Manual page 367

Chapter 12 Description of Parameter SettingsCT2000 Series
Frequency Point when switch from I/F Mode to PM Sensorless Mode

Settings
 The parameter is the switch point which is from low frequency to high frequency. It will
influence high/low frequency area of speed observer.
 If the switch point is too low, motor will generate not enough back emf to let the speed
estimator measure the right rotator's position and speed, and cause stall and oc when the
frequency of switch point is running.
 If the switch point is too high, the active area of I/F will too wide, and then it will generate
larger current to make it cannot save energy. (The reason is that if the current of Pr10-31
sets too high, and the high switch point will make the drive keeps outputting with the setting
value of Pr10-31)
Voltage pulse width

Settings
 The angle detection is 3:6-pulse. The parameter influences the value of pulse during the
angle detection. The larger the pulse is, the higher of the accuracy of rotator's position. But it
might cause oc easily.
 Increase the parameter when the running direction and the command are opposite while
start-up. If oc occurs in the start-up moment, then decrease the parameter.
Zero voltage time while start up

Settings
When the motor is in static status at the startup, the accuracy to estimate angles will be

increased. In order to make the motor in "static status", the drive 3 phase U, V, W output 0V
to motor to reach this goal. The Pr10-49 setting time is the length of time when three-phase
output 0V.
 It is possible that even when this parameter is being applied but the motor at the installation
site cannot go in to the "static status" caused by the inertia or by any external force. So, if the
motor doesn't go into a completer "static status" in 0.2 sec, increase appropriately this setting
value.
This parameter is functional only when the setting of Pr07-12 Speed Search during Startup

≠0.
If Pr10-49 sets too high, the start-up time will be longer obviously. If is too low, then the

braking performance will be weak.
Injection Frequency

Settings
 This parameter is a High Frequency Injection Command when the motor drive is under IPM
HFI sensor-less control mode and it doesn't often need to be adjusted. But, if a motor's rated
frequency (i.e. 400Hz) is too close to the frequency setting of this parameter (i.e. 500Hz),
0.00~599.00Hz
0~50 ms
0.000~60.000 sec.
0~1200Hz
12.2-00-5
Factory Setting:20.00
Factory Setting:10
Factory Setting: 0.000
Factory Setting: 500Hz