Siemens 6DR55 Series, Manual

Page: 110 / 178

Operation
108
SIPART PS2 PA Manual
A5E00127926--05
Response threshold alarm 1
and
Response threshold alarm 2
The alarm thresholds are related to the mechanical path
(MPOS--scale).
Function of the fault message output
If fault messages are used as a monitor for control non--conformities
over a period of time, they will be triggered in addition by the following
events also:
S
Power failure
S
Processor fault
S
Actuator fault
S
Valve fault
S
Compressed air failure
S
Responses of the limit values 46 to 50
Note that the fault message cannot be switched off, however it can be
suppressed (factory setting), if the actuator is set to ”non--automatic
mode”. If it is wished to generate fault messages here also, the
parameter FCT must be set to ” nA”. In addition there is also the facility
to ”alternate” the fault message using the status of the binary inputs.
For this, set the parameter FCT to ”” nAb””.
Select the setting ”-- ” if the fault message is to be sent inverted on the
alarm module or SIA module.
For more information on fault messages, see chapter 4.5.3 Online----
Diagnosis, page 113.
Monitoring time for setting the fault messages
The set value(s) serves as a specification for the time within which the
positioner must have reached the controlled state. The corresponding
response threshold is specified with ”45. LIM”.
The fault message output is set on exceeding the set time.
.
NOTE
If the control function to close tightly is activated, for parameter
”45. LIM” the monitoring of the control deviation in each overrun direc-
tion (YCDO: < 0 %, YCUP: > 100 %) is disabled. This function is par-
ticularly useful for valves with a soft seating. For long term monitoring
of the end--stop positions, we recommend activating the parameters
”48. ZERO” and ”49. OPEN”.
For more information on fault messages, see chapter 4.5.3 Online--
Diagnosis, page 118.
41.A1
42.A2
43. FCT
44. TIM