Hitachi L200 Series, Instruction Manual

Page: 90 / 280

“A” Group: Standard Functions
Configur
ing
Dr
iv
e P
a
ra
m
e
ters
3–18
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.
V
100%
20%
Hz
Voltage Gain
0
A045
“A” Function
Run
Mode
Edit
Defaults
Func.
Code
Name /
SRW Display
Description
–FEF
(EU)
–FU
(USA)
Units
A041 Torque boost select Two options:
00... Manual torque boost
01... Automatic torque boost
✔
00 00 %
V-Bst Slct MN
A241 Torque boost select, 2nd
motor
Two options:
00... Manual torque boost
01... Automatic torque boost
✔
00 00 %
2VBst Slct MN
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%
✔
5.0 5.0 %
V-Bst V 0005.0%
A242 Manual torque boost
value, 2nd motor
Can boost starting torque
between 0 and 20% above
normal V/f curve,
range is 0.0 to 20.0%
✔
0.0 0.0 %
2VBst V 0000.0%
A043 Manual torque boost
frequency adjustment
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%
✔
3.0 3.0 %
M-Bst F 0003.0%
A243 Manual torque boost
frequency adjustment,
2nd motor
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%
✔
0.0 0.0 %
2MBst F 0000.0%
A044 V/f characteristic curve
selection
Two available V/f curves;
three select codes:
00... Constant torque
01... Reduced torque
✘
02 02 —
CTRL C-TRQ