United Process Controls PROTHERM 50, Руководство по эксплуатации

Страница: 10 / 28

UNITED PROCESS CONTROLS GMBH Page 9 Protherm 50 P68.230
Maximum value of control variable Y of the regulator in%.
Ymin
Minimal value of the control variable Y of the regulator in%.
Ymax and Ymins define the work-range of the control variable Ý. Ymax is normally set to +100%.
The setting of Ymin depends on the control loop and the actuator. The following table gives some hints.
Actuator Structure Ymin
continuous, proportion-
al-valve only enriching gas, no air, 0%
continuous, proportion-
al-valve enriching gas and air -100% *
Magnetic-valve only enriching gas, no air, 0%
Magnetic-valve enriching gas and air -100% *
Servomotor -100%
* To avoid undershooting with negative setpoint steps, Ymin may be set to values in the range of –10%..
-100%.
RelLimit1, RelLimit2,
Relative-limits in units of the control variable.
All limits are activated if the actual values of the controller exceeds the limit. The effective limit of a rela-
tive-limit results from the
se relative-limit.
Example:
Control variable Cp, setpoint: 1,00%, RL1: 0,05%. The limit becomes active if the actual value of Cp
exceeds 1,05%.
(WA)
Rg1Relay, Rg2Relay,
effective direction of a relatively-limit. Rg1Relay active ON means that the Rg1Relay will be closed
when the limit becomes active. Active OFF means that the Rg1relay will be closed, when the limit be-
comes inactive.
AbsLimit1, AbsLimit2,
Absolute-limit in units of the control variable. The limit actively becomes and the corresponding relay
closes if the actual value of the regulator exceeds the absolute-limit (WA).
TSave
Security-temperature of the atmosphere-regulator.
The regulator is released, if TCS >= TSave or control variable is not Cp and the TCS-element is not
broken. A not released regulator behaves like a turned off regulator.
Refer to the security-hint at the beginning of this manual.
Control Variable
Selection the control variable of the Atm-controller. The standardization-value of the regulator is de-
pendent from the selection of the control variable:
control variable Standardization-value
Cp 1.00%C
KC 5.0
O2absolut 1e-20