Fisher FIELDVUE DVC6200 Instruction Manual page 31

Instruction Manual
D103605X012
Table 3‐7. Values for Disabling Partial Stroke Pressure Limit
Actuator Type Relay Type
A or C
Single Acting
B
Double Acting A
3. Run a partial stroke test.
4. Select the Press/Time radio button on the partial stroke graph (refer to the example in figure 3‐4, bottom plot). If
the actuator pressure starts high and moves low, find the minimum actuator pressure (Pmin). If the actuator
pressure starts low and moves high, find the maximum actuator pressure (Pmax). Double­acting actuators will
display differential pressure. Use table 3‐8 to estimate the partial stroke pressure limit.
Table 3‐8. Estimates for Partial Stroke Pressure Limits
Actuator Style Relay Type
A or C
Spring and
Diaphragm
A or C
Single Acting Piston
Double Acting Piston
5. Enable the parameters that were previously disabled:
D Travel Deviation Alert - set to 1.5x the maximum travel deviation between travel set point and travel.
D End Point Pressure Control - enable
D Partial Stroke Pressure Limit - calculate the value using table 3‐8.
Zero Power Condition
Closed
Open
Closed
Open
Closed
Open
Zero Power Condition
Closed
Open
Closed
B
Open
Closed
Open
Closed
B
Open
Closed
A
Open
Partial Stroke Start Point
Open
Closed
Open
Closed
Open
Closed
Open
Closed
Open
Closed
Open
Closed
PST Starting Point
Open
Closed
Open
Closed
Open
Closed
Open
Closed
Open
Closed
Open
Closed
Open
Closed
Open
Closed
Open
Closed
Open
Closed
Configuration
Partial Stroke Pressure Limit (Disabled)
0.0
Psupply
Psupply
0.0
Psupply
0.0
0.0
Psupply
-Psupply
Psupply
Psupply
-Psupply
Partial Stroke Pressure Limit
Pmin - 0.25 * (Bench Set High - Bench Set Low)
Pmax + 0.25 * (Bench Set High - Bench Set Low)
Pmax + 0.25 * (Bench Set High - Bench Set Low)
Pmin - 0.25 * (Bench Set High - Bench Set Low)
Pmax + 0.25 * (Bench Set High - Bench Set Low)
Pmin - 0.25 * (Bench Set High - Bench Set Low)
Pmin - 0.25 * (Bench Set High - Bench Set Low)
Pmax + 0.25 * (Bench Set High - Bench Set Low)
0.5 * Pmin
Pmax + 0.5 * (Psupply - Pmax)
Pmax + 0.5 * (Psupply - Pmax)
0.5 * Pmin
Pmax + 0.5 * (Psupply - Pmax)
0.5 * Pmin
0.5 * Pmin
Pmax + 0.5 * (Psupply - Pmax)
Pmin - 0.5 * (Psupply + Pmin)
Pmax + 0.5 * (Psupply - Pmax)
Pmax + 0.5 * (Psupply - Pmax)
Pmin - 0.5 * (Psupply + Pmin)
February 2017
(1)
31