YASKAWA CIMR-G5A 2015 - Page 204

7.5.1 Application Constants: b
Advanced Operation
7-50
D
Integral (I) Limit: b5-04
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
b5-04
Integral (I) limit
f
0.0 to 100.0 % 100.0
A A A A
•
This constant prevents the calculated value of the integral control in the PID control from exceed-
ing the fixed amount.
•
There is normally no need to change the setting.
•
Reduce the setting if there is a risk of load damage, or of the motor going out of step, by the Invert-
er’s response when the load suddenly changes. If the setting is reduced too much, the target value
and the feedback value will not match.
•
Set this constant as a percentage of the maximum output frequency, with the maximum frequency
taken as 100%.
D
PID Limit: b5-06
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
b5-06
PID limit
f
0.0 to 100.0 % 100.0
A A A A
•
Constant b5-06 prevents the frequency reference after PID control from exceeding the fixed
amount.
•
Set this constant as a percentage of the maximum output frequency, with the maximum frequency
taken as 100%.
D
PID Offset Adjustment: b5-07
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
b5-07
PID offset adjust-
ment
f
−100.0 to
100.0
% 0.0
A A A A
•
Constant b5-07 adjusts the PID control offset.
•
If both the target value and the feedback value are set to zero, adjust the Inverter’s output frequency
to zero.
D
PID Primary Delay Time Constant: b5-08
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
b5-08
PID primary delay
time constant
f
0.00 to
10.00
s 0.00
A A A A
•
Constant b5-08 is the low-pass filter setting for PID control outputs.
•
There is normally no need to change the setting.
•
If the viscous friction of the mechanical system is high, or if the rigidity is low, causing the mechan-
ical system to oscillate, increase the setting so that it is higher than the oscillation frequency period.
This will decrease the responsiveness, but it will prevent the oscillation.
J
PID Output Characteristics: b5-09 (for SPEC: F)
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
b5-09
PID output charac-
teristics
×
0, 1 − 0
A A A A
D
Settings
Setting Function
0
PID output has forward characteristics
1
PID output has reverse characteristics
7