8
FORM NO. L-21174-E-1209
SINGLE AIR PRESSURE CONTROL SYSTEM
Nexen’s Single Air Pressure Control System consists of:
Constant Bleed Type Regulator, Gauge, Quick Exhaust
Shuttle Valve, Tee Fitting , 3-Way N.C. (Normally Closed)
Solenoid Valve, and Air Line.
AIR CONNECTIONS
NOTE: Nexen recommends using a Constant Bleed Air
Regulator along with a 3-Way Solenoid Valve to ensure
a total "crisp" release when overload conditions arise.
ELECTRICAL CONNECTIONS
PLC
Valve
Torque
Limiter
Prox.
Sensor
Nexen Supplied
Torque
Limiter
Prox.
Sensor
Valve
Relay
Nexen Supplied
NOTE: Scan time for PLC on proximity sensor should not exceed 0.07 seconds.
Proximity Sensor Wiring Schematic
FIGURE 4
FIGURE 3
BU
L2
L1
BN
LOAD
Voltage
20–250 VAC,
10–300 VDC
Line Frequency
40–60 Hz
Voltage Drop Across
Conducting Sensor
<6.0 V at 100 mA
Continuous Load Current
<100 mA
Off-State (Leakage) Current
<1.7 mA
Minimum Load Current
3.0 mA
Maximum Inrush Current
1.0 A (<30 ms, 15% Duty
Cycle)
PROXIMITY SENSOR SPECIFICATIONS
CAUTION
Do not use rigid pipe and tubing when making
air line connections. Torque on the air line
caused by bearing drag may be relieved by
resting the air line on a support parallel to the
torque limiter center-line. Align the air inlet
port to the six o'clock down position to allow
condensation in the air chamber to drain out
of the exhaust port.
The supplied Proximity Sensor is shown operating in two
typical scenarios in Figure 3. It is the responsibility of
the system integrator to ensure the limits of the Proximity
Sensor Specifications are followed for integration into a
robust system. See Figure 4 for Proximity Sensor Wiring
Schematic, and Table 3 for Electrical Specifications.
TABLE 3
All Nexen pneumatically actuated devices require clean
and dry air, which meet or exceeds ISO 8573.1:2001
Class 4.4.3 quality.
The following is a common air supply scheme used with
this product. This is an example and not an all-inclusive
list. All air circuits to be used with this product must be
designed following EN983 guidelines.
NOTE
For quick response, Nexen recommends a quick exhaust
valve and short air lines between the Control Valves and
the unit. Align the air inlet ports to a down position to
allow condensation to drain out of the air
chambers of the product.
