u
Control Mode Selection
gives an overview of the U1000 iQpump control modes and their various features.
Table 1.2 Control Modes and Features
Motor Type
Induction Motors
Comments
Control Mode
V/f
OLV
–
Parameter Setting
A1-02 = 0
A1-02 = 2
Default Setting is V/f control
(A1-02 = 0)
Basic Description
V/f control
Open Loop Vector control
–
Type of Applications
Motor Type
IM
IM
–
Multi Motor
YES
–
–
Motor data unknown
YES
–
–
High Speed Accuracy
–
YES
–
High Speed Response
–
YES
–
Torque Limit Operation
–
YES
–
Control Characteristics
Speed Control Range
1:40
1:200
May fluctuate with characteristics and
motor temperature.
Speed Accuracy
±2 to 3%
±0.2%
Speed deviation rate between speed
reference value and motor speed (100% =
rated speed, motor temperature 25 °C ±10
°C) when operating at normal status and
when load is stable.
Speed Response
3 Hz (approximately)
10 Hz
Maximum frequency of a speed reference
signal that the drive can follow may
fluctuate with characteristics and motor
temperature.
Starting Torque
150% at 3 Hz
200% at
0.3 Hz
Starting torque may fluctuate with
characteristics and motor temperature.
Performance may differ by capacity.
Application-Specific
Auto-Tuning
• Stationary Auto-Tuning for Line-to-Line Resistance
Automatically adjusts parameter settings
that concern electrical characteristics of
the motor
• Rotational Auto-Tuning for
V/f Control
• Stationary Auto-Tuning 2
• Stationary Auto-Tuning 3
• Rotational Auto-Tuning
Torque Limit
–
YES
Sets the maximum torque for the motor to
protect the load and connected machinery.
Speed Search
YES
YES
Bi-directional speed detection of a
coasting motor to restart it without
stopping.
Energy-Saving Control
YES
YES
Saves energy by always operating the
motor at its maximum efficiency.
Overexcitation
Deceleration
YES
YES
Provides fast deceleration without using a
braking resistor.
Commercial Power
Switching Selection
YES
–
When the output frequency matches the
power supply frequency (60 Hz), the
PWM switching operation stops and
switches to operation with a direct
commercial power supply connection.
1.2 General Description
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YASKAWA TOEPYAIUPW01A YASKAWA AC Drive - U1000 iQpump Matrix Drive User Manual