Pi-Bal - ABB ACS800 Application Manual

24
Operation
Connections
PI
Type
Illustration
Operation
Connections

PI-BAL

Type
Illustration
Operation
Connections
Function blocks
The output is true if any of the inputs is true. Truth table:
I1 I2 I3 O (binary)
0 0 0 False (All bits 0)
0 0 1 True (All bits 1)
0 1 0 True (All bits 1)
0 1 1 True (All bits 1)
1 0 0 True (All bits 1)
1 1 0 True (All bits 1)
1 1 1 True (All bits 1)
Input I1, I2 and I3: Boolean values
Output (O): 24 bit integer value (packed boolean)
PI controller
PI
I1
I2
O
I3
The output is input I1 multiplied by I2/100 plus integrated I1 multiplied by I3/100.
O = I1· I2/100+(I3/100) · I1
Note: The internal calculation uses 48 bits accuracy to avoid offset errors.
Inputs I1: 24 bit integer value (23 bit + sign)
Input I2:
- 24 bit integer value (23 bit + sign)
- Gain factor. 100 corresponds to 1. 10 000 corresponds to 100.
Input I3:
- Integrator coefficient. 100 corresponds to 1. 10 000 corresponds to 100.
Output (O): 24 bit integer (23 bits + sign). The range is limited to 0...10000.
Initialisation block for the PI controller
PI-BAL
I1
I2
The block initialises the PI block first. When input I1 becomes true, the block writes
the value of I2 to the output of the PI block. When I1 becomes false, the block
releases the output of the PI controller block which continues normal operation from
the set output.
Note: The block may be used only with the PI block. The block must follow the
PI block.
Input I1: Boolean value
Input I2: 24 bit integer value (23 bits + sign)
O (value on display)
0
-1
-1
-1
-1
-1
-1