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INTRODUCTION

5 - 1

SECTION 5 - OPERATING PROCEDURES

INTRODUCTION

This section details the equalizing valve of the optional manifold

(Type AV___1___ positioner).

NOTE: This section only applies when the positioner is equipped

with a manifold assembly.

EQUALIZING AND AIR SUPPLY SHUTOFF VALVE

The equalizing valve, supplied with the manifold assembly, allows

the actuator to be manually or automatically operated. By turning

the valve handle to MAN, supply pressure to the positioner is cut

off and the 01 and 02 ports are tied together, allowing manual

repositioning of the actuator.

NOTE: It is important to understand that the equalizing valve is

not a bypass valve. Be aware that if the actuator is not secured

before transferring the valve handle of the manifold, the actuator

will move.

Transfer from Automatic to Manual Operation

1. Manually lock the actuator or final control element.

2. If equipped with a manifold and equalizing valve, push in the

valve handle and turn it to the MAN position.

3. If not equipped with a manifold and equalizing valve, turn off

the supply air.

NOTE: If there are no means of locking the actuator or final con-

trol element, it will move in the direction of the process or

mechanical load when the supply air is turned off.

Transfer from Manual to Automatic Operation

1. Verify that the valve handle is in the MAN position.

WARNING

Lock the actuator in place or be aware of the possible move-

ment before moving the equalizing valve to MAN or AUTO.

Failure to do so could result in injury to personnel.

ABB AV1 User Manual

Other manuals for ABB AV1