Yaskawa AC Drive Z1000 AC Drive HVAC Fan - Manual (Page 140)

Setting 0: Operator (d1-01)
Setting 1: Operator (d1-02)
Setting 2: Operator (d1-03)
Setting 3: Operator (d1-04)
Setting 4: Terminals
Setting 5: Serial Communication
Setting 6: Option Card
u S3: Secondary PI (PI2) Control
The drive has a built in PI (Proportional + Integral) controller that can be used for closed loop control of system variables such
as pressure or temperature. The difference between the target and the feedback value (deviation) is fed into the PI controller
and the PI controller outputs the frequency to U5-oo for monitoring. Refer to b5: PI Control on page 37 for details.
S3-06
PI2 P Gain
-1
PI2 I Time
1
S3-07 +
+
S3-08
PI2 I Limit
<1>
z -1 PI2 Invert
Multi-function
Input Closed
+
+
Upper Limit:
S3-09
PI2 Output Upper
Limit
Lower Limit:
S3-10
PI2 Output Lower Limit
U5-19
PI2 Input
-1
S3-10 = 0
S3-10 = 1
PI2
Integral
Hold Multi-
function
Input
PI2 Integral
Reset Multi-
Function Input
MEMOBUS DH
PI2 Setpoint
MEMOBUS
000FH
bit 4 = 1
H3-10=25
Terminal A2
S3-05
PI Setpoint
+
H3-10=26
Terminal A2
-
U5-17
PI2 Setpoint
U5-18
PI2 Feedback
U5-20
PI2 Output
Lower Limit:
S3-10
PI2 Output Lower Limit
PI2 Disable
Multi-function
Input <2>
S3-12
0
1
2
<1> Actual integral limit is calculated as follows:
Upper limit = Min (S3-08, S3-09 - PI2 P portion)
Lower limit = Min (-S3-08, S3-10 - PI2 P portion)
<2> When PI2 Disable multi-function input is closed, set PI Integrator as follows:
S3-12 = 1: PI I Value = S3-10
S3-12 = 2: PI I Value = S3-05
Figure 1.75 PI2 Block Diagram
n S3-01: Secondary PI Enable Selection
Determines when the secondary PI controller is enabled.
No. Name Setting Range Default
S3-01 Secondary PI Enable Selection 0 to 3 0
Setting 0: Secondary PI Disabled
Setting 1: Always
Setting 2: Drive Running
Setting 3: Motor Running
Available when the drive is not at zero speed, not in base block, and not in DC injection.
n S3-02: Secondary PI User Display
Sets the scale value of 100% PI input. The decimal place shifts based on S3-03.
No. Name Setting Range Default
S3-02 Secondary PI User Display 0 to 60000 1000 <1>
<1> Unit is determined by S3-03.
1.11 S: Special Parameters
140 YASKAWA ELECTRIC SIEP YAIZ1U 03A YASKAWA AC Drive – Z1000 Programming Manual