81
"A" Group: Standard Functions Section 3-5
Voltag e gain - Using parameter
A045 you can modify the voltage
gain of the inverter (see graph at
right). This is specified as a percent-
age of the full scale output voltage.
The gain can be set from 20% to
100%. It should be adjusted in accor-
dance with the motor specifications.
Gain can be changed even during
operation in V/f mode, and while
stopped in SLV mode.
After the setting is done, please be
sure to reset (terminal RS on/off) to recalculate the motor constant.
Refrain from change the setting value suddenly (within 10%). Inverter may
overvoltage trip due to the rapid change of output voltage.
Voltage compensation gain and slip compensation gain - Using parame-
ters
A046 and A047, you can obtain better performance under automatic torque
boost mode (
A041=01). See following table for the concept of adjustment,
including other parameters.
Symptom Adjustment Adjust item
Motor torque is not enough
at low speed (The motor
does not rotate at low
speed)
Increase the voltage setting for manual
torque boost, step by step/
A042 / A242
Increase the voltage compensation gain
for automatic torque boost, step by step
A046 / A246
Increase the slip compensation gain for
automatic torque boost, step by step
A047 / A247
Reduce carrier frequency b083
Motor speed decreases
(stalls) when a load is
given to the motor
Increase the slip compensation gain for
automatic torque boost, step by step
A047 / A247
Motor speed increases
when a load is given to the
motor
Decrease the slip compensation gain for
automatic torque boost, step by step
A047 / A247
The inverter trips due to
overcurrent when a load is
given to the motor
Decrease the voltage setting for manual
torque boost, step by step
A042 / A242
Decrease the voltage compensation gain
for automatic torque boost, step by step
A046 / A246
Decrease the slip compensation gain for
automatic torque boost, step by step
A047 / A247
100%
fbase
fmax
A045=100
80%
A045=80
V
0
"A" Function Run
Mode
Edit
Defaults
Func.
Code
Name Description EU Units
A041 Torque boost select Two options:
00... Manual torque boost
01... Automatic torque boost
8 00 –
A241 Torque boost select, 2
nd
motor 8 00 –
A042 Manual torque boost value Can boost starting torque
between 0 and 20% above normal
V/f curve, range is 0.0 to 20.0%
9 1.0 %
A242 Manual torque boost value,
2
nd
motor
9 1.0 %
A043 Manual torque boost frequency Sets the frequency of the V/f
breakpoint A in graph (top of pre-
vious page) for torque boost,
range is 0.0 to 50.0%
9 5.0 %
A243 Manual torque boost fre-
quency, 2
nd
motor
9 5.0 %
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