Hitachi L200 Manuale Utente

“A” Group: Standard Functions

Configur

ing

e P

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.

100%

20%

Voltage Gain

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

✔

V-Bst Slct MN

A241 Torque boost select, 2nd

motor

Two options:
00... Manual torque boost
01... Automatic torque boost

✔

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

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

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

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

2MBst F 0000.0%

A044 V/f characteristic curve

selection

Two available V/f curves;
three select codes:
00... Constant torque
01... Reduced torque

✘

—

CTRL C-TRQ