cashco 764P Посібник зі встановлення, експлуатації та обслуговування - Сторінка 3
Переглянути онлайн або завантажити pdf Посібник зі встановлення, експлуатації та обслуговування для Контролер cashco 764P. cashco 764P 14 сторінок. Pneumatic pressure controllers
Друкувати сторінкуPanel Mounted. Not factory provided. Requires
field provision of a panel opening and support
bracket per the below dimensions:
Panel
#10-32 machine
screws
PANEL CUTOUT
(Front View)
Countersink hole
for #10-32 fl at heat
machine screw.
Figure 6
Panel Mounted Assembly View
9. It is recommended that a 764PD be bracket or
panel mounted. A 764PD can be pipe nipple
mounted from 1/4" NPT connection.
10. Clean the piping and tubing of all foreign materials
including chips, burrs, dirt, etc., prior to use.
Use care in applying thread sealant or TFE tape
to prevent excess material from entering the
con nect ing pipe or tubing.
11. Controllers may be oriented in any position in doors.
Outdoors, recommended locations are with the
main lon gi tu di nal axis in a horizontal position,
or with the pneumatic sensor head directed
down wards. Exhibit care to assure rainwater is
pre vent ed from entering the unused exhaust port
(Port A or Port B).
12. Connect piping/tubing per Tables 1 and 2.
13. 764P/PD's can operate with a lubricated, non-
dried air supply. However, good practice and other
system com po nents (airsets, relays, etc.) dictate
use of the highest quality air supply avail able.
If air can not be practically dried and bears oil,
coalescing filters should be utilized to remove
as much oil and water as possible, as well as
IOM-764P / PD
INSTALLED ASSEMBLY
(Bottom View)
#10-32 fl at head
machine screw and nut
Adjusting Screw
particles over 20 microns. Desiccant dried air
is absolutely required for outdoor installations
ex posed to freezing temperatures.
14. For 764PD the system must be designed such that
the "HIGH" pressure is always at a higher value
than the "LOW" pressure is at the same time. If
the expected HIGH and LOW pressures reverse
with respect to each other, the unit will become
inoperative, and the output will increase towards
full IAS pressure of 18–20 psig (1.24–1.38 Barg).
Controller
IAS to Port
Direct
Supply
A
Exhaust
B
Increase in
pressure Increases
Process
output signal
Pressures
Above Atm.
Increase in
Pressure
differential pressure
Increases output
signal
Controller
Direct
IAS to Port
Supply
B
A
Exhaust
Vacuum
Increase in
vacuum
Process
Below Atm.
Increases output
signal
Pressure
NOTE: 764PD cannot be utilized in vacuum service.
Pressure Reducing Applications
Controller
Actions
IAS to
Control
Port
Valve
Reverse-
Increase in pressure
ATO-FC
B *
decreases output
(REVERSE)
signal.
Valve "fails closed".
Direct-
ATC-FO
Increase in pressure
A
(DIRECT)
increases output signal.
Valve "fails open".
Back Pressure/Relief Applications
Actions
Reverse-
Increase in pressure
ATC-FO
B *
decreases output
(DIRECT)
signal.
Valve "fails open".
Direct-
ATO-FC
Increase in pressure
A
(REVERSE)
increases output signal.
Valve "fails closed".
* Common applications
TABLE 1
764P
Action
Reverse
Exhaust
Supply
Increase in
pressure Decreases
output signal
764PD
Increase in
differential pressure
Decreases output
signal
764P
Action
Reverse
Exhaust
Supply
Increase in
vacuum
Decreases output
signal
TABLE 2
Controller
Pressure
Adjustment
Controller
CW = - Pres
CCW = + Pres
CW = + Pres
CCW = - Pres
CW = - Pres
CCW = + Pres
CW = + Pres
CCW = - Pres
Uncommon applications
3