Warren Controls AmurAct Actuator Linkage and Motor - Manual (Page 3)

3
AmurAct IOM_AA_RevH_0413
LEvER
STEM
CONNECTOR
vALvE
STEM
LINkAgE
LOCkNUT
REAR SAFETy
SHIELD
LINk
INPUT
SHAFT
CRANk
BENCHMARk
LINkAgE
BASE
AmurAct Linkage
(front Safety Shield Removed)
Refer to page 2 and below for identification and location of compo-
nents and parts.
Four AmurAct MOTORS are available: the F3 and F5 produce 120
pound-inches of torque and the F4 and F6 produce 240 pound-inch-
es. A
MOTOR is selected according to the valve type and size, the
differential pressure against which the valve must operate, and the
power source that is available. Consult Product Specifications for ad-
ditional information on motor selection.
Each motor contains an internal Enerdrive® energy source to run the
motor to a fail-safe valve position if operating power is lost. An ad-
vanced AutoStroke feature apportions the control signal over the ac-
tual range of valve movement for increased accuracy; and provides
“soft stops” at both ends of travel to extend operating life. See page 6
for location of the Reset/Autostroke pushbutton.
The MOTOR applies rotary motion and rotational force to the INPUT
SHAFT of the AmurAct LINKAGE by means of the SHAFT CLAMP.
The
CRANK is welded to the INPUT SHAFT and rotates with it.
Clockwise CRANK rotation is translated by the LINK and causes the
LEVER to rotate counterclockwise (upward) about the fixed pivot at
its left end (as shown below).
A STEM CONNECTOR is threaded onto the valve stem and attached
to the LEVER by two connecting links. Upward movement of the LE-
VER draws the VALVE STEM upward. The articulated link connec-
tion reduces side loading on the valve stem packing. Raising the stem
of a two-way valve opens it. Raising the stem of a three-way valve
opens the lower (L) port and shuts the upper (U) port. When the
MO-
TOR reverses direction, the lever is drawn downward and the valve
stem is pushed downward, reversing the control valve action.
When the AmurAct linkage has been calibrated, the BENCHMARK
indicates the position of the CRANK when the valve plug makes
contact with the valve seat. Further counterclockwise rotation of the
CRANK exerts seating force onto the valve plug to produce very tight
closure. On a two-way valve with ¾” stem travel, motion stops when
the
CRANK and LINK are aligned with each other, perpendicular to
the LEVER. This is the lockup position, and is maintained by the Amu-
rAct linkage without sustained MOTOR torque.
Factory default settings call for an increasing 2-10 volt or 4-20 mAdc
signal to open the control valve. Therefore, loss or interruption of the
control signal will cause the two-way valve to shut, or the lower (L)
port of a three-way valve to shut. Similarly, loss of operating power
will activate the Enerdrive fail-safe system to drive the AmurAct link-
age to the fail-safe position. Upon restoration of operating power,
AmurAct returns to normal operation after the Enerdrive fail-safe en-
ergy source is fully recharged, typically 30 seconds or less ... with no
operator action required.
STEM CONNECTOR
SHOULDER
SCREW
STEM
JAM NUTS
ThEORy OF OPERATION