Introduction; General; Function - BLX v100 positioner Installation, Operating And Maintenance Instructions

V100 Positioner
Thank you for choosing the BLX V100 positioner

1. INTRODUCTION

1.1 General.

BLX V100 is a compact, modular positioner for both
rotary and linear actuators, double or single acting.
There are two basic types:
V100P for a pneumatic signal and
V100E for a current signal.
BLX V100 has independent zero and span
adjustments, making calibration very simple.
External access for zeroing is standard.

1.2 Function

The V100 utilizes the force balance principal of
operation.
The desired value, in the form of pressure, affects
the membrane(1) with the force that is created
transferred to the balance arm(2).
The opposing force, which represents the actual
value, is provided by the feedback spring(5) and
works in the opposite direction on the balance
arm(2).
The feedback spring, resting on the guide arm(3),
is positioned by the shape and response of the
cam.
The cam(4) is connected to the cylinder's (actua-
tor) piston rod via the drive.
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BLX V100 corrosion resistant painting and sealing
meet NEMA 4X as well as the sealing requirement
IP 66.
BLX V100 is furnished standard with four connect-
tions for gauges and a threaded opening for venting
the positioner's exhaust.
The BLX R100 feedback unit for the V100 is
offered as an accessory (see separate manual).
The pilot valve(6) is connected to the balance arm
and follows the balance arm's movement.
The system is stable when the spool(7) is in the
neutral position and the forces that affect the
balance arm is in equilibrium.
As soon as a signal change or a change in the
position of the piston rod occurs, the force balance
is also changed and the spool moves. Air immedi-
ately begins to flow into the part of the cylinder
(C+ or C-) which allows the feedback mechanism
to return the spool to the neutral position.
The system is self-stabilizing and searches for
equilibrium.