Honeywell EXCEL 5000 User Manual page 200

ALPHABETIC REFERENCE
Recommended PID Plus Gains
PID Plus Algorithm
74-5577–33 (US)
EN2B-0184 GE51 R0518 (Europe)
PID Controller (if W is NOT entered as a parameter)
P3 Proportional band Xp
P4 Derivative time Tv (in seconds).
P5 Integral action time Tn (in seconds). If you set Integral action time to zero in the
internal parameters dialog box, software sets the P4 parameter to 1,000,000. A
number this large effectively disables the integral term.
P6 Minimum output (in percent)
P7 Maximum output (in percent)
P8 Actual integral action time Tn (in seconds). If XD1 is zero, P8 is also zero. If
XD1 is one, P8 contains the user-defined value of Tn stored in P5.
PID Controller (if W is entered as a parameter)
P3 Proportional band Xp
P4 Derivative time Tv (in seconds).
P5 Integral action time Tn (in seconds). If you set Integral action time to zero in the
internal parameters dialog box, software sets the P4 parameter to 1,000,000. A
number this large effectively disables the integral term.
P6 Minimum output (in percent)
P7 Maximum output (in percent)
P8 Reference variable (W)
P9 Actual integral action time Tn (in seconds). If XD1 is zero, P9 is also zero. If
XD1 is one, P9 contains the user-defined value of Tn stored in P5.
The following parameter values are recommended based on a 5-second controller
cycle time.
Type of
Control
P
PI
PID
The PID algorithm is based on the discrete form of the non-iterating PID formula:
Y = 50 + (100 * E n / Xp) + (100 / (Xp * Tn)) *
Temperature Control Application
Mixed
Gain Units Air
Xp f
Xp f
Tn sec 800
Xp f
Tn sec 1333
Tv sec
n
∑
(E i * to) + (100 * Tv / Xp)*((E n - E n-1 ) / to)
=
i 0
202
EXCEL CARE CONTROL ICONS
Cooling Coil Heating Coil
13 20
13 20
143
13 20
143
6 30
20
20
83
20
83
15