Section 5 - Operating Procedures; Introduction; Equalizing And Air Supply Shutoff Valve; Transfer From Automatic To Manual Operation - ABB AV3 Instruction Manual

INTRODUCTION

EQUALIZING AND AIR SUPPLY SHUTOFF VALVE

WARNING

Transfer from Automatic to Manual Operation

Transfer from Manual to Automatic Operation

SECTION 5 - OPERATING PROCEDURES

This section details the equalizing valve of the optional manifold.
NOTE: The following procedure applies when the positioner is
equipped with a manifold assembly.
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 01 and 02 are tied together, allowing manual repositioning
of the actuator.
NOTE: It is important to understand that the equalizing valve is
not a bypass vale. Be aware that if the actuator is not secured
before transferring the valve handle of the manifold, the actuator
will move.
Moving the equalizing valve to MAN or to AUTO will cause
the actuator to move if it is not locked. If unaware of the
movement, personal injury can occur.
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 not 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.
1. Valve handle should be in the MAN position.
INTRODUCTION
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