Owner's manual

(c) Square-Root Shaped Cam. The square-
root (Jx) shape will prcduce a
relatively large output change. for small
input chaoges during approximately the
first 10% of signal range. When
operating in the “pper portion of the
signal range, a large input change will
be required to produce a small output
change.
3. Inverse Operation. On inverse acting power
positioners, the cam bar is reversed top to
bottom and the reversal manifold is turned
90”. This causes the supply air to be diiected
to the bottom of the piston when signal air
pressure is increased and to the top of the
piston when signal air pressure is decreased.
I” this type of installation, piston movement
is inversely related to the signal -as signal
pressure decreases, the piston lowers, as
signal pressure raises, the piston raises.
4. Manual Operation. Power positioner can be
contmlled manually through manual lever.
Moving this lever directly controls position
of device being controlled. To operate
manual lever, shut off supply air and open
bypass valve.
System Gmsiderations. Prior to installation of
your Rosemount 4 X 5 Power Positioner, check
that you have all components necessary to install
system completely.
Once you have verified that you have all
components, select mounting location. A typical
installation is illustrated in Figure 1-3. Determine
where power positioner will be placed in tams of
serviceability, available power supply, ambient
temperatures, environment”1 considerations, and
convenience. Power Positioner operating specifi-
cations are listed in Table 1-2. Become familiar
with Section II, Installation, before instrilling “nit.
Table l-2. Specikations for Model PP405TR Power Positioner.
Signal Requirements
Inputs:
Direct - 4-20 mA/3-15 psig/O-30 psig/3-27 psig
Inverse - 20-4 mA/15-3 p&/30-0 psig/27-3 psig
OUtpUt.%
5 inch Stroke (80” Shaft Rotation)
Performance
Repeatability . .
Full Stroke Time (““loaded) .
Cylinder Air Pressure
Supply Air Co”sumptio”
Control Torque
Stall Torque .
Physical Characteristics
Weight ___ _____ _______ .___ .._. _. ________
Dust Cover
Supply Air Inlet
Environmental Requirements
Ambient Temperature Limits
Without heater .
With Heater
Relative Humidity
Air Supply Requirements
Operating Air Supply Pressure Range
Recommended Air Supply Pressure
0.15% of full stroke
3 set Maximum Allowable
120 psig
0.5 scfnl free air
240 ft-lbs
400 ft-lbs
SO lbs, typical
Designed to meet NEMA type 3 Requirements
l/4 inch NPT female connection
40°F to 14OV (4.5’C to 60°C)
-lOOF to 14ooF (-23.3”C to 60°C)
Operable up to 100% RH
45 to 120 psig
100 psig