Instruction Manual

Detailed Setup

September 2013

4-21

ACTUAL TRACE FROM TEST (TYPICAL)

Figure 4-9. Time Series Plots of Travel Set Point, Travel, Error, and Actuator Pressure for a Typical Emergency Shutdown Valve

Pause Time—Setup Wizard sets the Partial Stroke

Pause Time to 5 seconds. This is the pause time

between the up and down strokes of the test. It can be

set for 5, 10, 15, 20 or 30 seconds.

PST Press Limit (single-acting actuators)—During

Setup Wizard or Auto Travel Calibration, the Partial

Stroke Pressure Limit will be set to a positive value for

single-acting actuators. For those actuators that vent

from the test starting point, the pressure limit will be a

minimum value. For those actuators that fill from the

test starting point, the pressure limit will be a

maximum value. The pressure signal used for this

threshold depends on relay type and is summarized

below.

Relay Type Pressure Signal

A or C Port A − Port B

B Port B − Port A

B Special App. Port B

C Special App. Port A

PST Press Limit (double-acting actuators)— During

Setup Wizard or Auto Travel Calibration, the PST

Press Limit will be set to a negative value for actuators

where the Partial Stroke Start Point is opposite of the

Zero Power Condition (e.g., Partial Stroke Start Point

= Open and Zero Power Condition = Closed) and to a

positive valve for actuators where the Partial Stroke

Start Point is the same as the Zero Power Condition.