Delta VFD4A8ME21ANNAA User Manual

Chapter 12 Description of Parameter SettingsME300
12.1-10-2

PM Sensorless Speed Estimator Low-pass Filter Gain
Default: 1.00
Settings 0.00–655.35
 Changes the response speed of the speed estimator.
 If there is low frequency vibration (the waveform is similar to a sine wave) during the process,
then increase the gain. If there is high frequency vibration (the waveform shows extreme
vibration and is like a spur), then decrease the gain.

Initial Angle Detection Pulse Value
Default: 1.0
Settings 0.0–3.0
 The angle detection is fixed to 3: Use the pulse injection method to start.
The parameter influences the value of the pulse during the angle detection. The larger the pulse,
the higher the accuracy of rotor’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 During Start-up
Default: 00.000
Settings 00.000–60.000 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 state at start-up, this increases the accuracy when estimating angles.
In order to put the motor in static state, set the three-phase drive output to 0 V to the motor. The
Pr.10-49 setting time is the length of time for three-phase output at 0 V.
 It is possible that even when you apply this parameter, the motor cannot go in to the static state
because of inertia or some external force. If the motor does not go into the static state in 0.2
seconds, increase this setting value appropriately.
 If Pr.10-49 is too high, the start-up time is longer. If it is too low, then the braking performance is
weak.

Injection Frequency
Default: 500
Settings 0–1200 Hz
 This parameter is a high frequency injection command in PM SVC control mode, and usually you
do not need to adjust it. But if a motor’s rated frequency (for example, 400 Hz) is too close to the
frequency setting for this parameter (that is, the Default of 500 Hz), it affects the accuracy of the
angle detection. Refer to the setting for Pr.01-01 before you adjust this parameter.
 If the setting value for Pr.00-17 is lower than Pr.10-51*10, then increase the frequency of the
carrier wave.
 Pr.10-51 is valid only when Pr.10-53 = 2.

Delta VFD4A8ME21ANNAA Specifications

General

Brand	Delta
Model	VFD4A8ME21ANNAA
Category	DC Drives
Language	English