Delta CFP2000 Series, User Manual

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Chapter 12 Description of Parameter Settings

CFP2000
12.1-10-2

Frequency Point to Switch from PM Sensorless Mode to I/F Mode
Default: 20.00
Settings 0.00–599.00 Hz

Sets the switch point from high frequency to low frequency.

If the switch point is too low, the motor does not generate enough back-EMF to let the speed
estimator measure the rotor right position and speed when running at the switch point
frequency.

If the switch point is too high, the active area of I/F is too wide, which generates more current
and cannot save energy. If the current value for Pr.10-31 is too high, the high switch point
makes the drive continue to output with the setting value for Pr.10-31).

I/F Mode, Id Current Low-Pass Filter Time
Default: 0.2
Settings 0.0–6.0 sec.

Sets the filter time for Pr.10-31. Smoothly increases the magnetic field to the current command
setting value under the I/F mode.

If you want to slowly increase the size of Id, increase the filter time to avoid a Step phenomenon
occurs when starting current output. When decrease the filter time (minimum value is 0), the
current rises faster, then a Step phenomenon occurs.

Initial Angle Detection Pulse Value
Default: 1.0
Settings 0.0–3.0 times of motor rated current

This parameter is valid only when setting of Pr.10-53=2 or 3.

The parameter influences the value of the pulse during the angle detection. The larger the pulse,
the higher the accuracy of rotator’s position. A larger pulse might cause oc.

Increase the parameter when the running direction and the command are opposite during
start-up. If oc occurs at start-up, then decrease the parameter.

Refer to Section 12-2 Adjustment & Application for detailed motor adjustment procedure.

Zero Voltage Time while Start-up
Default: 0.000
Settings 0.000–60.000 sec.

This parameter is valid only when the setting of Pr. 07-12 (Speed Tracking during Start-up) = 0.

When the motor is in static status at the start-up, this increases the accuracy when estimating
angles. In order to put the motor in static status, set the three-phase drive output to 0 V to the
motor. The Pr.10-49 setting time is the length of time when three-phase output at 0 V.

It is possible that even when you apply this parameter, the motor cannot go into the static state
because of inertia or some external force. If the motor does not go into the static status in 0.2
seconds, increase the setting value appropriately.

If Pr.10-49 is too high, the start-up time is longer. If it is too low, the braking performance is
weak.