Scanivalve MPS4264, Руководство по аппаратному и программному обеспечению, Страница: 36 / 99

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MPS4264
Section 4: Hardware
switching states (between measurement and calibration/
purge modes) that any pressure applied to the “CAL” or
the “PURGE” ports could “sneeze” past the sealing O-rings
and reach the pressure sensor. To prevent risking potential
damage to the sensors, the valve should always be cycled
with no “CAL” or ”PRG” pressure supplied.
Also note that when the valve is in the calibrate/purge
state, all 32 measurement inputs on each valve are tied
together and connected to the “PRG” input. For most
applications this is not a problem, but it will allow “mixing”
of measurement pressures between channels. In cases
where humid or dirty air is being measured, this “mixing”
would provide a flow path in a higher pressure input and
back out of a lower pressure input, carrying moisture or
debris with it. If it is the case where the module will be
help in calibrate/purge mode for an extended period of
time while still connected to dirty or humid measurement
pressures, a purge pressure great enough to prevent flow
from the test article to the scanner should be supplied. For
most applications however, this is not needed.
Electrical Connectors
The MPS4264 has two electrical connectors located
adjacent to each other on one end of the module. Both
connectors are TE Connectivity “Mini I/O” series and are
polarized to prevent improper connections. The connec-
tors are latching to ensure a reliable connection. To
disconnect the connectors, press down on the latch (shown
in Figure 4-7 below) and pull up on the connector.
Figure 4-7: Power/Ethernet Connector Latch
Power Connector & Power Requirements
The power connector servers three purposes. Primarily it
is the power connector, bringing in the 9-36Vdc required
to power the MPS. Additionally, it serves as the external
trigger input (pins 4 & 5) as well as the serial communi-
cations connection (pins 1-3). See “Appendix F - Cable
Drawings and Pinouts” on page 88 for cable drawings
and pinout.
The MPS accepts 9-36Vdc and has a maximum power
consumption of 3.5W.
CAUTION! Do not make or break
the power connector with power
applied! Doing so risks damage to
the module!
Ethernet Connector
The Ethernet connection is the primary means of commu-
nications with the MPS4264. The connection does support
MDIX Auto-Crossing. See “Appendix F - Cable Drawings and
Pinouts” on page 88 for cable drawings and pinout.
MPSTCU-Thermal Control Unit
The MPS (Miniature Pressure Scanner) line of Thermal
Control Units is available for applications where tempera-
ture changes may be great enough to exceed the
temperature compensated range of the scanner. Exceeding
the compensated temperature range can induce errors in
the pressure measurements. See “Section 1: Specifications”
on page 7, for more information on the compensated
temperature range. MPSTCU applications include flight test,
automotive, wind turbine, wind tunnel, and engine tests.
When used in a flight test environemnt, it is recommended
that the TCU case be vented.
Each MPSTCU includes a rugged IP-54 rated aluminum
enclosure, pneumatic connectors, and a power/data
connection. The MPSTCU offers an optional heater circuit
which can provide a controlled temperature environment
while the MPSTCU is subject to a cold environment (up
to -60°C). Additional, the MPSTCU also offers an optional
cooling port to provide cooling air when the MPSTCU is
subject to temperatures from 60-120°C. When the Cooling
Kit is used, 3.0CFM of 23°C air is required while operating
the MPSTCU in a 125°C environment.
For wiring diagrams of MPSTCU cabling, see “MPS4264TCU
Cable” on page 90.