Azbil 100 Series, Руководство пользователя

Страница: 29 / 80

3-1
Chapter 3. Adjustments
3-1. Auto-setup
Auto-setup is a unique program for automatically making various positioner adjustments.
After installing your SVP, Auto-setup should be performed. The travel switch on the SVP
provides non-interactive closed and open valve position setting.
The following valve actuator characteristics are automatically detected during Auto-setup:
„
Zero-span adjustment
(However, as a default, the span point is taken to be 10% of the overstroke. If a span
adjustment is performed after auto-setup completes, change the overstroke value and save
the change value.)
„
Actuator operation setup
„
Lower Range Value (LRV) and Upper Range value (URV) of Input signal
If actuator operation is reverse operation: LRV = 4 mA, URV = 20 mA
If actuator operation is direct operation: LRV = 20 mA, URV = 4 mA
„
Actuator size setting
„
Hysteresis setting
(Hysteresis of ground packing is selected out of LIGHT, MEDIUM and HEAVY.)
„
Valve assembly calibration
If you specified the type of actuator your SVP will be installed on, then the required overtravel
for tight shut-off will have been programmed into your SVP. The required overtravel for tight
shut-off is the maximum shut off less 1%. If you didn’t specify the type of actuator, and you
are using a non-Azbil Corporation actuator, then please refer to page 4-11 for instructions
on how to enter the actuator type using a Commstaff. Tight shut-off requires the proper
overtravel setting.
WARNING
While Auto-setup is running, the valve will cycle from open to closed. Take appropriate
measures to prevent injury to personnel and adverse effects on the process.
It is recommended that Auto-setup and initial calibration of your SVP be performed using
the travel switch on the SVP.
You may also use a portable communicator to initiate Auto-setup and initial calibration.
Because Auto-Setup and Zero-Span calibration must be observed for accurate valve
positioning, these two steps will typically be performed by the travel switch. Other functions
including loop test, valve travel inquiry, split-ranging and tag number assignment require a
Commstaff.