3–19

L2002 Inverter

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 specifi-

V 100%

Voltage Gain

A045

cations.The following table shows the methods of torque control selection.

20%

0

Hz

 

 

 

 

“A” Function

Run

 

Defaults

 

 

 

 

 

 

 

 

 

 

Mode

 

 

 

 

 

 

 

Func.

Name /

 

 

–FE(F)

–FU

 

 

 

 

 

 

Description

Edit

Units

 

ParametersDrive

 

 

Code

SRW Display

 

Lo Hi

(EU)

(USA)

 

 

 

 

 

 

 

 

 

 

 

 

Configuring

 

 

 

 

 

 

 

 

 

 

 

A041

2VBst Slct

MN

01 .. Automatic torque boost

✘ ✘

00

00

%

 

 

Torque boost select

 

Two options:

 

 

 

 

 

V-Bst Slct

MN

00 .. Manual torque boost

 

 

 

 

 

 

 

 

 

 

 

 

01 .. Automatic torque boost

 

 

 

 

 

 

 

 

A241

Torque boost select, 2nd

Two options:

✘ ✘

00

00

%

 

 

 

 

 

motor

 

 

00 .. Manual torque boost

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A042

Manual torque boost

Can boost starting torque

✔ ✔

1.8

1.8

%

 

 

 

 

 

 

 

value

 

 

between 0 and 20% above

 

 

 

 

 

 

 

 

 

 

 

 

normal V/f curve,

 

 

 

 

 

 

 

 

 

V-Bst V

0005.0%

 

 

 

 

 

 

 

 

 

range is 0.0 to 20.0%

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A242

Manual torque boost

Can boost starting torque

✔ ✔

0.0

0.0

%

 

 

 

 

 

value, 2nd motor

 

between 0 and 20% above

 

 

 

 

 

 

 

 

 

 

 

 

normal V/f curve,

 

 

 

 

 

 

 

 

 

2VBst V

0000.0%

 

 

 

 

 

 

 

 

 

range is 0.0 to 20.0%

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A043

Manual torque boost

Sets the frequency of the V/f

✔ ✔

10.0

10.0

%

 

 

 

 

 

frequency adjustment

breakpoint A in graph (top of

 

 

 

 

 

 

 

 

 

 

 

 

previous page) for torque

 

 

 

 

 

 

 

 

 

M-Bst F

0003.0%

 

 

 

 

 

 

 

 

 

boost, range is 0.0 to 50.0%

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A243

Manual torque boost

Sets the frequency of the V/f

✔ ✔

0.0

0.0

%

 

 

 

 

 

frequency adjustment,

breakpoint A in graph (top of

 

 

 

 

 

 

 

 

 

2nd motor

 

 

previous page) for torque

 

 

 

 

 

 

 

 

 

 

 

 

boost, range is 0.0 to 50.0%

 

 

 

 

 

 

 

 

 

2MBst F

0000.0%

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A044

V/f characteristic curve

Two available V/f curves;

✘ ✘

00

00

 

 

 

 

 

selection

 

 

three select codes:

 

 

 

 

 

 

 

 

 

 

 

 

00 .. Constant torque

 

 

 

 

 

 

 

 

 

CTRL

C-TRQ

 

 

 

 

 

 

 

 

 

01 .. Reduced torque