Burkert Type 8611 - Manual (Page 75)

75
FunctionsoftheConfigurationLevel
12.13.1. KP1, KP2 - setting the proportional coefficient
(proportional gain)
Depending on the actuating element selected in the MODE menu (see chapter 12.3), the influence of the propor-
tional coefficient varies. It serves as proportional gain [K
p
] either for opening or for closing the actuating element.
calculation of the proportional gain [K
p
]:.
Calculation for continuous control ( MODE = SCV, 4 – 20 or 0 – 10):
The proportional gain is calculated by dividing the value for the manipulated variable change [∆%] by the value for
the process value change [∆PV].
∆%
∆PV Manipulated variable change
Process value change
K
p
=
Depending on the selected actuating element in the MODE menu the manipulated variable is scaled as follow:
MODE = SCV 0 % = Pulse duty factor 0 % 100 % = Pulse duty factor 100 % (relatively to PWM-
frequency)
MODE = 0 - 10 0 % = Manipulated variable 0 V 100 % = Manuipulated variable 10 V
MODE = 4 - 20 0 % = Manipulated variable 4 mA 100 % = Manipulated variable 20 mA
MODE = 2P - T 0 % = Valve closed 100 % = Valve (VLV1) open in relatio to time T
reg
(T
reg
= 100 %)
MODE = 3P - T 0 % = Valve 1 closed 100 % = Valve 1 (VLV1) in relatio to time T
reg
(T
reg
= 100 %)
0 % = Valve 2 closed -100 % = Valve 2 (VLV2) in relatio to time T
reg
(T
reg
= 100 %)
MODE = PCV 0 % = Valve 1 closed 100 % = Valve 1 (VLV1) in relatio to time T
reg
(T
reg
= 100 %)
0 % = Valve 2 closed -100 % = Valve 2 (VLV2) in relatio to time T
reg
(T
reg
= 100 %)
Speciality: The controller operates as a discontinous 2-state controller or 3-state controller if in the MODE menu
as actuating element 2P - T or 3P - T is selected and the proportional gain K
p
is set to 9999 (independent from
decimal place). The parameters T
reg
and T
n
have no influence to the control..
The influence of the proportional value on the actuating element and the calculation of the proportional gain:
actuating
element
(selection in
MODE =) influence proportional
coefficient calculation of the
proportional gain
[K
p
]
value range
SCV
4 – 20
0 – 10 Proportional gain K
p1
for
opening and closing the
actuating element
∆%
∆PV
K
p1
=
0.001 – 9999
Changing the decimal places
→
Press the ENTER key to select KP1 or KP2.
→
Use the arrow key to move to the left until the
decimal place flashes.
→
Now use the up arrow key to position the
decimal place at the correct place and
confirm with ENTER.
PCV
2P – T
3P – T Proportional gain K
p1
for
opening the actuating
element
∆%
∆PV
K
p1
=
PCV
3P – T
Proportional gain K
p2
for closing the actuating
element
∆%
∆PV
K
p2
=
Table 27: KP1, KP2 - Proportional gain
english
Type 8611