Amtech
6-56
6
GROUP – 4: V / F CHARACTERISTICS
A401: Control Mode
Set the required motor control mode. This Parameter does not change by default Load in B311.
A401=1:
V/F Open loop Heavy duty Control.
A401=2: V/F
Close-loop Heavy duty Control.
A401=3:
Sensor-less Heavy duty Vector Control.
A401=4:
Close-loop Heavy duty Vector Control.
A401=5:
V/F Open loop Normal duty Control
A401=6:
V/F Close-loop Normal duty Control
A401=7:
Sensor-less Normal duty Vector Control
A401=8:
Close-loop Normal duty Vector Control
A402: V/F Selection
Select appropriate v/f curve as per the application.
The AC DRIVE can be operated in linear curve mode, Square curve or custom setting mode.
In a linear curve mode, the v/f curve will be linear through out the range from minimum frequency to
Base frequency.
In square curve, the v/f curve will be square as shown in the figure. Fan and pump application require
additional energy conservation on variable torque/ horsepower loads due to reduced output v/f at
lower frequencies. So that Fan and pump loads can be programmed with X=Y
2
law.
The custom mode setting allows the user to set different v/f points on characteristic curve using
parameters A403 ~ A410.
Vout
Fout
Base frequency
(A403)
Base voltage
(A404)
Linear curve
(A402=1)
Square curve
(A402=2)
A403: Base Frequency (%)
This is output frequency up to which the v/f is maintained constant. The unit operates in constant
torque mode up to this point and thereafter changes to constant horsepower mode. The maximum
output voltage at this point can be set with base voltage A404.
This is percentage of Motor Frequency
B105.
A404: Base Voltage (%)
This parameter sets the maximum output voltage when the output frequency reaches to base
frequency as set in parameter A403. The voltage set is percentage of motor voltage B102.
A405 ~ A407: V/F1 ~ 3 Frequency (%)
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