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SSCC Configuration
Chapter 5
15: Anti-Surge Control General Configuration
List 15 defines general properties for anti-surge control that are independent
from the primary and secondary anti-surge PID loops. These general
configuration properties are used for the following controls.
• Anti-surge valve control value limits
• Anti-surge valve slew rate limits
• Ant-surge valve position deviation alarming
• Anti-surge PID loop min/max selection
• Anti-surge PID loop tracking
The following table identifies the configuration parameters, range limits, and
initial values.
Table 45 - Parameter List 15: Anti-Surge Control General Configuration
No.
Description
Range
Initial Value
01
Anti-surge PID Loop Output Min/Max Select Type. Choices:
0 = Minimum select
1 = Maximum select
0 or 1
1
02
Not Running Control Value, % open.
0…100
The anti-surge valve is set to this control value whenever the compressor is “Not Running” or
“Unloaded.” This value overrides the PID output values calculated by the primary or secondary antisurge PID loops.
If this value exceeds the min or max CV limits expressed in parameters 7 and 8, the min/max
limited value is used under the “Not Running” or “Unloaded” condition.
100
03
PID Track Margin, % Open.
When both the primary and secondary anti-surge PID loops are configured, this value sets the
tracking limit for the PID loop that is not producing the selected output. This keeps the noncontrolling loop from winding up and moving away from the control value by more than a PID track
margin.
For example, if the PID track margin is set to 10%, the select type is set to “Maximum,” the
compressor is Running and Loaded, the primary PID loop output is max selected and at 60%, and
the secondary PID loop output is 55% and reducing. If the secondary loop output reduces below
50% (60% - 10%) the secondary output is limited (tracks) at 50%. If the primary loop output
increases to 61%, the secondary loop tracking rises to 51% (61% - 10%).
0…100
5
04
Anti-surge Valve Location. Choices
0 = Blow-Off valve
1 = Recycle Valve
This setting is used to modify the representation of the anti-surge valve connections on the Process
Overview page of the Operator screen.
0 or 1
1
05
Open Slew Rate, %/sec.
Limits the opening rate of the control value.
Normally, the anti-surge opening slew rate is set to allow fast opening.
0…999999
100
06
Close Slew Rate %/sec.
Limits the closing rate of the control value.
Normally, the anti-surge closing slew rate is set to close the valve slowly.
0…999999
2
07
Control Value Max Limit % Open.
Sets the max limit for the control value for the valve.
0…100
100
Rockwell Automation Publication 1711-UM002A-EN-P - September 2012
User-configured
Value
69