Operation Manual 37107F
MFR 3 - Multi Function Relay
© Woodward
Page 79/165
Analog Controller (Setting ANALOG)
Parameter
57
V/Q contr.output
----------------
V controller: range
see below
If Parameter 53 "V/Q contr. type" has been configured as "ANALOG", the type of
analog output must be selected in this screen. The use of a jumper between termin-
als 11/12 determines if the output is a voltage or current output. All available
ranges are listed in the table below.
Type
Setting in above
configuration
screen
Jumper
between
term.
11/12
Range
Lower
level
Upper
level
Current
+/-20mA (+/-10V)
no
+/-20mA
-20 mA
+20 mA
+/-10mA (+/-5V)
+/-10mA
-10 mA
+20 mA
0 to 10mA (0 to 5V)
0 to 10mA
0 mA
10 mA
0 to 20mA (0 to 10V)
0 to 20mA
0 mA
20 mA
4 to 20mA
4 to 20mA
4 mA
20 mA
10 to 0mA (5 to 0V)
10 to 0mA
10 mA
0 mA
20 to 0mA (10 to 0V)
20 to 0mA
20 mA
0 mA
20 to 4mA
20 to 4mA
20 mA
4 mA
Voltage
+/-20mA (+/-10V)
yes
+/-10V
-10 Vdc
+10 Vdc
+/-10mA (+/-5V)
+/-5V
-5 Vdc
+5 Vdc
+/-3V
+/-3V
-3 Vdc
+3 Vdc
+/-2.5V
+/-2.5V
-2.5Vdc
+2.5
Vdc
+/-1V
+/-1V
-1 Vdc
+1 Vdc
0 to 10mA (0 to 5V)
0 to 5V
0 Vdc
5 Vdc
0.5V to 4.5V
0.5 to 4.5V
0.5 Vdc
4.5 Vdc
0 to 20mA (0 to 10V)
0 to 10V
0 Vdc
10 Vdc
10 to 0mA (5 to 0V)
5 to 0V
5 Vdc
0 Vdc
4.5V to 0.5V
4.5 to 0.5V
4.5 Vdc
0.5 Vdc
20 to 0mA (10 to 0V)
10-0V
10 Vdc
0 Vdc
Parameter
58
Volt.controller
gain.Kpr 000
V controller: P-gain
1 to 240
The proportional-action coefficient K
PR
indicates the closed-loop control system
gain. By increasing the gain, the response is increased to permit larger corrections
to the variable to be controlled. The farther out of tolerance the process is the larger
the response action is to return the process to the tolerance band. If the gain is con-
figured too high, the result is excessive overshoot/undershoot of the desired value.
Parameter
59
Volt.controller
reset Tn 00.0s
V controller: reset time
0.0 to 60.0 s
The reset time T
n
represents the I-component of the PID controller. The reset time
corrects for any offset (between set point and process variable) automatically over
time by shifting the proportioning band. Reset automatically changes the output re-
quirements until the process variable and the set point are the same. This parameter
permits the user to adjust how quickly the reset attempts to correct for any offset.
The reset time constant must be greater than the derivitive time constant. If the re-
set time constant is too small, the engine will continually oscilate. If the reset time
constant is too large, the engine will take to long to settle at a steady state.
Parameter
60
Volt.controller
derivat.Tv 0.00s
V controller: derivative-action time
0.00 to 6.00 s
The derivative-action time T
V
represents the D-component of the PID controller.
By increasing this parameter, the stability of the system is increased. The controller
will attempt to slow down the action of the throttle in an attempt to prevent exces-
sive overshoot
or undershoot. Essentially this is the brakes for the process. This
portion of the PID loop operates anywhere within the range of the process unlike
reset.