Siemens 6DR50 Series Operating Instructions Manual page 180

Parameterizing/addressing
9.4 Description of parameters
A5.RPMD - Ramp mode
Setting options:
Purpose:
Factory setting:
A6.RPRT - Ramp rate
Adjustment range:
Purpose:
Factory setting:
A7.FLBH - Behavior after failed PST
Setting options:
Purpose:
Factory setting:
178
• OFF
• On
Enable or disable ramp mode.
• OFF: The partial stroke test is executed in an uncontrolled
manner.
• On: The partial stroke test is executed in a controlled manner.
Control is at the ramp rate set in the "A6.RPRT" parameter.
Use ramp mode to shorten or extend the time of the partial stroke
test. Extend the partial stroke test to give the higher-level control
loop a chance to react to the partial stroke test.
OFF
0.1 ... 100.0 %/s
Change the ramp rate to shorten or extend the duration of the partial
stroke test. The ramp rate refers to the total stroke of the control
valve and is set in % stroke per second (%/s). Smaller values extend
the duration, larger values shorten the duration of the partial stroke
test. Example: Setting "10.0" means that the partial stroke test is run
with 10% stroke per second.
1.0 %/s
• Auto
• HOLd
• AirIn
• AirOu
Specify how the positioner is to respond if a partial stroke test fails.
Note: A partial stroke test fails if the limit threshold set in "Factor 3
(AC.FACT3)" is exceeded.
• Auto: Switch to "Automatic" mode. "AUT" is displayed on the
device.
• HOLd: Hold current position.
• AirIn: Pressurize actuator with supply air PZ.
• AirOu: Depressurize actuator.
Auto
SIPART PS2 with and without HART
Operating Instructions, 09/2014, A5E00074631-12