Emerson Fisher FIELDVUE DVC6000 HW2, Instruction Manual

Page: 35 / 120

Instruction Manual
D103785X012
Configuration
June 2017
35
Table 3‐6. Values for Disabling Partial Stroke Pressure Limit
Actuator Type Relay Type Zero Power Condition Partial Stroke Start Point Partial Stroke Pressure Limit (Disabled)
Single Acting
A or C
Closed
Open 0.0
Closed Psupply
Open
Open Psupply
Closed 0.0
B
Closed
Open Psupply
Closed 0.0
Open
Open 0.0
Closed Psupply
Double Acting A
Closed
Open -Psupply
Closed Psupply
Open
Open Psupply
Closed -Psupply
3. Run a partial stroke test.
4. Select the Press/Time radio button on the partial stroke graph (refer to the example in figure 3‐6, 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 3‐7 to estimate the partial stroke pressure limit.
Table 3‐7. Estimates for Partial Stroke Pressure Limits
Actuator Style Relay Type Zero Power Condition PST Starting Point Partial Stroke Pressure Limit
(1)
Spring and
Diaphragm
A or C
Closed
Open Pmin - 0.25 * (Bench Set High - Bench Set Low)
Closed Pmax + 0.25 * (Bench Set High - Bench Set Low)
Open
Open Pmax + 0.25 * (Bench Set High - Bench Set Low)
Closed Pmin - 0.25 * (Bench Set High - Bench Set Low)
B
Closed
Open Pmax + 0.25 * (Bench Set High - Bench Set Low)
Closed Pmin - 0.25 * (Bench Set High - Bench Set Low)
Open
Open Pmin - 0.25 * (Bench Set High - Bench Set Low)
Closed Pmax + 0.25 * (Bench Set High - Bench Set Low)
Single Acting Piston
A or C
Closed
Open 0.5 * Pmin
Closed Pmax + 0.5 * (Psupply - Pmax)
Open
Open Pmax + 0.5 * (Psupply - Pmax)
Closed 0.5 * Pmin
B
Closed
Open Pmax + 0.5 * (Psupply - Pmax)
Closed 0.5 * Pmin
Open
Open 0.5 * Pmin
Closed Pmax + 0.5 * (Psupply - Pmax)
Double Acting Piston A
Closed
Open Pmin - 0.5 * (P Pmin)
Closed Pmax + 0.5 * (Psupply - Pmax)
Open
Open Pmax + 0.5 * (Psupply - Pmax)
Closed Pmin - 0.5 * (P Pmin)
5. Enable the parameters that were previously disabled:
D
Travel Deviation Alert - set to 1.5 x 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 3‐7.