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CNT-APG002-EN 61
®
Index
Numerics
4 to 1 ratio for gains, 11, 52
A
action, 17-18
determining, 18
direct, 17, 52
examples, 18
recommended values, 18
reverse, 17, 52
actuator
and error deadband, 19
and PID output, 2
cycling, troubleshooting, 46
aliasing, 12
applications, 29-44
building pressure control, 18, 32-33
cascade control, 34-36
cooling, 17
discharge-air temperature control,
29-31
duct static pressure control, 11, 12,
18
heating, 16, 17
list of, 1
recommended action for, 18
recommended error deadband for,
19
recommended gains for, 11
recommended sampling frequency
for, 14
staging, 20-21, 37-44, 52
steam valve control, 6
variable-air-volume control, 20
B
braking, dynamic, 6
building pressure control, 18, 32-33
C
calculating
action, 18
error deadband for staged outputs,
21, 40
gains, 11
sampling frequency, 14-15
staging points, 42
calculations, PID, 3-6
cascade control, 34-36
cascade control program
PCL, 34
TGP, 35
conversion function, 2
cooling, 17
cooling tower fans, staging, 37-44
See also staging
cycling of equipment or output
minimizing, 19, 20, 39
troubleshooting, 46, 47-50
D
damper, relief, 32-33
DDC, 23
derivative
control, 5-6
gain, 3, 6, 10-11, 52
direct action, 17, 52
direct digital control (DDC), 23
disable conditions, 24, 25, 27
discharge-air temperature control,
29-31
duct static pressure control, 11, 12, 18
dynamic braking, 6