Yaskawa G5HHP Drive - Manual (Page 177)

7.2 Normal V/f Control
7 - 13
J
Hunting Prevention Selection: C7-01
User
Change
during Setting Factory
Valid Access Levels
User
Constant
Number
Name
g
during
Opera-
tion
Setting
Range
Unit Factory
Setting V/f
Control
V/f with
PG
Open
Loop
Vector
Flux
Vector
C7-01
Hunting prevention
selection
x 0, 1 -- 1 A A x x
D
Settings
Setting Function
0 Disables the hunting-prevention function.
1 Enables the hunting-prevention function.
J
Hunting Prevention Gain: C7-02
User
Change
during Setting Factory
Valid Access Levels
User
Constant
Number
Name
g
during
Opera-
tion
Setting
Range
Unit Factory
Setting V/f
Control
V/f with
PG
Open
Loop
Vector
Flux
Vector
C7-02
Hunting prevention
gain
x 0.00 to 2.50 Mul-
tiple
1.00 A A x x
Normally it isn’t necessary to change these constants. Adjust these constants as follows if hunting occurs
with a light load.
D
Increase the setting in C7-02 if oscillation occurs when operating with a light load.
(If the setting is increased too much, the current can fall to the point where stalling occurs.)
D
Decrease the setting in C7-02 if stalling occurs.
D
Disable the hunting-prevention function (C7-01 = 0) if high responsiveness is more important than sup-
pressing oscillation.
7.2.3 Setting Motor Constants
J
Motor Rated Slip: E2-02
User
Change
during Setting Factory
Valid Access Levels
User
Constant
Number
Name
g
during
Opera-
tion
Setting
Range
Unit Factory
Setting V/f
Control
V/f with
PG
Open
Loop
Vector
Flux
Vector
E2-02 Motor rated slip x
0.00 to
20.00
Hz 1.30 A A Q Q
D
This setting is used as a reference value for the torque compensation function.
D
The default setting depends upon the Inverter capacity.
(The table shows the default settings for 400-V class, 200 kW Inverters.) (See page 8 - 42.)
D
Calculate the rated slip (E2-02) from the value shown on the motor nameplate with the following equa-
tion and set this value.
Rated slip = rated frequency (Hz) -- rated speed (r/min) × number of poles/120
J
Motor No-load Current: E2-03
User
Change
during Setting Factory
Valid Access Levels
User
Constant
Number
Name
g
during
Opera-
tion
Setting
Range
Unit Factory
Setting V/f
Control
V/f with
PG
Open
Loop
Vector
Flux
Vector
E2-03 Motor no-load current x
0.00 to
2000.0
A 96.0 A A Q Q
D
This setting is used as a reference value for the torque compensation function.
D
The default setting depends upon the Inverter capacity.
(The table shows the default settings for 400-V class, 200 kW Inverters.) (See page 8 - 42.)
D
Set the no-load current (E2-03) at the rated voltage and rated frequency. Normally this value isn’t shown
on the motor nameplate, so it might be necessary to contact the motor manufacturer.
7