Hitachi X200-002SFE/NFU Instruction Manuals page 91

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
percentage of the full scale output voltage.
The gain can be set from 20% to 100%. It
should be adjusted in accordance with the
motor specifications.
The following table shows the methods of
torque control selection.
Func.
Code
A041
A241
A042
A242
A043
A243
A044
A244
A045
A245
More user manuals on
"A" Function
Name /
SRW Display
Torque boost select
V-Bst Slct MN
Torque boost select, 2 nd motor
2VBst Slct MN
Manual torque boost value
V-Bst V 0005.0%
Manual torque boost value,
2 nd motor
2VBst V 0005.0%
Manual torque boost
frequency adjustment
M-Bst F 0003.0%
Manual torque boost
frequency adjustment,
2nd motor
2MBst F 0000.0%
V/f characteristic curve
CTRL C-TRQ
V/f characteristic curve,
2nd motor
2CTRL C-TRQ
V/f gain setting
V-Gain 00100%
V/f gain setting,
2nd motor
2V-Gain 00100%
ManualsBase.com
V
100%
80%
0
Description
Two options:
00...Manual torque boost
01...Automatic torque boost
Can set boost starting torque
between 0 and 20% above normal
V/f curve,
range is 0.0 to 20.0%
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%
Two available V/f curves;
00...Constant torque
01...Reduced torque
06...Reduced torque1
Sets voltage gain of the inverter,
range is 20. to 100.%
3−17
A045=100
A045=80
fbase fmax
Run Defaults
Mode -FE -FU
Units
Edit (EU) (USA)
00 00 %
00 00 %
1.8 1.8 %
0.0 0.0 %
10.0 10.0 %
0.0 0.0 %
00 00 −
00 00 −
100. 100. %
100. 100. %