Dinverter
A
User Guide
Issue code: d2au9
78
Current limit
The current limit can operate when the Drive is driving the motor
(motoring) or when the Drive is braking the motor (regenerating).
If the current limit is reached during motoring, the output frequency of the
Drive is reduced. If this occurs during acceleration, the acceleration ramp is
stopped.
If the current limit is reached during motor regeneration, the output
frequency of the Drive is increased under PI control. If this occurs during
deceleration, the deceleration ramp is stopped.
When the active/real (torque-producing) component of the motor current
exceeds 105% of the motor rated current, motor overload detection in the
Drive becomes active. If the overload reaches the limit (based on the model
in the Drive of the thermal time-constant of the motor), the Drive trips. A
higher overload current increases the risk of the Drive tripping.
If the motor current rating is lower than the Drive current rating,
0.46
Motor – rated current
should be set accordingly by the user at a value
lower than FLC.
0.06
can then be set at a value proportionally greater than
150%.
Voltage boost
0.07
Select voltage
mode
RW
Bit
0 ~ 1
1
Set at 0 for fixed boost at the level set in
0.08
Boost voltage
.
Set at 1 for automatic boost given by:
[0.08]
××
[Percentage current load] ÷ 100 (%)
0.08
Boost voltage
RW
Uni 0 ~ 25.5
% [0.44]
10
The boost voltage increases the motor current over the frequency range up
to 50% of [0.47]
Motor rated frequency
.
V
b
==
××
[ .
]
[ .
]
0 08
100
0 44
100
Where
V
b
is the boost voltage expressed as a percentage of the
AC
supply voltage.
0.09
Select
dynamic V/f
RW
Bit
0 ~ 1
0
Set at 0 for fixed linear voltage-to-frequency ratio. Use this setting for
constant-load or constant-torque applications.
Set at 1 for voltage-to-frequency ratio to be dependent on load current; this
will save power and reduce acoustic noise in the motor when lightly loaded.
Use this setting for fan or pump applications.
