Voltage Gain - Hitachi L200 Series Instruction Manual

3–18
"A" Group: Standard Functions
Be aware that running the motor at a low speed for a long time can cause motor
overheating. This is particularly true when manual torque boost is ON, or if the motor
relies on a built-in fan for cooling.
NOTE: Manual torque boost applies only to constant torque (A044=00) and variable
torque (A044=01) V/f control.
Voltage 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 accordance with the motor specifi-
cations.
The following table shows the methods of
torque control selection.
Func.
Code SRW Display
A041 Torque boost select
V-Bst Slct
A241 Torque boost select, 2nd
motor
2VBst Slct
A042 Manual torque boost
value
V-Bst V
A242 Manual torque boost
value, 2nd motor
2VBst V
A043 Manual torque boost
frequency adjustment
M-Bst F
A243 Manual torque boost
frequency adjustment,
2nd motor
2MBst F
A044 V/f characteristic curve
selection
CTRL
"A" Function
Name /
Two options:
00... Manual torque boost
MN
01... Automatic torque boost
Two options:
00... Manual torque boost
01... Automatic torque boost
MN
Can boost starting torque
between 0 and 20% above
normal V/f curve,
0005.0%
range is 0.0 to 20.0%
Can boost starting torque
between 0 and 20% above
normal V/f curve,
0000.0%
range is 0.0 to 20.0%
Sets the frequency of the V/f
breakpoint A in graph (top of
previous page) for torque
0003.0%
boost, range is 0.0 to 50.0%
Sets the frequency of the V/f
breakpoint A in graph (top of
previous page) for torque
boost, range is 0.0 to 50.0%
0000.0%
Two available V/f curves;
three select codes:
00... Constant torque
C-TRQ
01... Reduced torque
V
100%
20%
0
Run
Mode
Description
Edit

Voltage Gain

A045
Hz
Defaults
–FEF –FU
Units
(EU) (USA)
00 00 %
00 00 %
5.0 5.0 %
0.0 0.0 %
3.0 3.0 %
0.0 0.0 %
02 02 —