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Parameter assignment/Addressing
10.2 Description of parameters
10.2.2.14 Description of parameter 44
44.TIM - monitoring time to set the fault messages
Use this parameter to set the value in seconds before which the positioner must attain the
corrected status. The corresponding response threshold is defined using the "45. LIM"
parameter.
The fault message output is set when the set time is exceeded.
Note
Activated tight closing function
If the tight closing function is activated, the monitoring of control deviation in the
corresponding overrun direction is switched off for the "45. LIM" parameter. "YCDO: < 0 %"
and "YCUP: > 100 %" are applicable in such a case. This function is mainly advantageous
for the valves with soft seats. In order to monitor the end positions for a long time, we
recommend activating the "F. ZERO" and "G. OPEN" parameters.
The factory setting is "Auto".
10.2.2.15 Description of parameter 45
45. LIM - response threshold of fault message
Use this parameter to set a value for the permissible extent of the control deviation to trigger
a fault message. The value is specified in percent.
If the "44. TIM" and "45. LIM" parameters have been set to "Auto", the fault message is set
when the slow step zone is not reached within a specific time. The "Auto" setting is the
factory setting. Within 5 to 95% of the actuator travel, this time is two times the initialization
time, and outside 10 to 90% it is ten times the initialization time.
Note
Activated tight closing function
If the tight closing function is activated, the monitoring of control deviation in the
corresponding overrun direction is switched off for the "45. LIM" parameter. "YCDO: < 0 %"
and "YCUP: > 100 %" are applicable in such a case. This function is mainly advantageous
for the valves with soft seats. In order to monitor the end positions for a long time, we
recommend activating the ""F. ZERO" and "G. OPEN" parameters.
The factory setting is "Auto".
154
SIPART PS2 with PROFIBUS communication
Operating Instructions, 09/2007, A5E00127926-07
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