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Page 13 of 40
The calculations for the PID values are the same as used in the standard Ziegler
- Nichols equations that have been recognized as standard for decades.
The only modification to the application of the Ziegler - Nichols equations is
controlled by the
dFC1dFC1
dFC1dFC1
dFC1 and
dfC2dfC2
dfC2dfC2
dfC2 menu items. These menu items control the
amount of rate (derivative) that is applied. A
dFC1dFC1
dFC1dFC1
dFC1 or
dfC2dfC2
dfC2dfC2
dfC2 setting of
33
33
3 (factory
default) or less allows for less damping. A
dFC1dFC1
dFC1dFC1
dFC1 or
dfC2dfC2
dfC2dfC2
dfC2 setting of
44
44
4 allows
for critical damping as set forth in Ziegler - Nichols. A
dFC1dFC1
dFC1dFC1
dFC1 or
dfC2dfC2
dfC2dfC2
dfC2 setting
of
55
55
5 or more allows over damping of the process.
Program Setup and Operation
In the secondary menu set
tun1tun1
tun1tun1
tun1 or
tun2tun2
tun2tun2
tun2 to
SELFSELF
SELFSELF
SELF. Skip
Lrn1Lrn1
Lrn1Lrn1
Lrn1 /
Lrn2Lrn2
Lrn2Lrn2
Lrn2 and check
to make sure that
dFC1dFC1
dFC1dFC1
dFC1 /
dfC2dfC2
dfC2dfC2
dfC2 is (are) set to the desired value. Back up to
Lrn1Lrn1
Lrn1Lrn1
Lrn1 /
lrn2lrn2
lrn2lrn2
lrn2 and set to
YESYES
YESYES
YES. The control will begin the Self Tune function.
While the Self Tune function is active, the right hand decimal point on the
lower display will blink. When Self Tune is complete, the blinking will stop.
After Self Tune is complete, the
tun1tun1
tun1tun1
tun1 /
tun2tun2
tun2tun2
tun2 setting(s) automatically
switch(es) to
PIDPID
PIDPID
PID. This allows examination and / or modification of the
values calculated. We recommend that you do not change the calculated
values unless you have a firm understanding of the parameters involved and
their function. For more information on PID tuning, please contact your
supplier.
OPERATION AND PROGRAMMING OF OPTIONS
Option C4, Serial Communication.
The serial communications option allows the control to be written to and read
from a remote computer or other similar digital device. Communication is
allowed through a RS-485 (Option C4) port.
See Wiring for Optional Inputs and Outputs for information on wiring the
communication lines. Wiring for the RS-485 is run from control to control in
a daisy chain fashion with a termination resistor (120 ohms) across the
transmit and receive terminals of the last control in the chain.
Select the control address and communication baud rate with the
AddrAddr
AddrAddr
Addr and
bAUdbAUd
bAUdbAUd
bAUd menu items in the Secure Menu. The address for Zone 1 will be the
address selected. The address for Zone 2 will be the address selected for Zone
1 plus one. For example, if
AddrAddr
AddrAddr
Addr is set to 1E, Zone 1 parameters will be
addressed through address 1E and Zone 2 parameters will be addressed
through address 1F.