MODEL 070M69 COMPUTATIONAL SIGNAL CONDITIONER MODULE
2
Slot
– carefully pry to expose fuse drawers
Power Switch
Fuse Drawers
AC Receptacle
Figure 1
. Fuse Replacement
1.2
Description
The PCB Modular Signal Conditioning System is a
flexible, compact means of coordinating and
customizing the signal conditioning needs of
vibration,
pressure,
or
force
sensing
instrumentation. At its most basic level, the system
consists of a rectangular chassis with a single-slot
power supply on the right side of the chassis and
one module (customer specified). This power
supply is either AC or battery power, depending on
customer requirements. It should be noted,
however, that the AC and DC power supplies are
separate units, having differing part numbers. See
Section 1.2.3 and 1.2.4 for a more detailed
description of the power supplies.
1.2.1
Chassis
(Model
441A33,
441A35,
441A38, 441A42, 441A43, 441A45, and
441A49)
The chassis configuration varies, ranging from two
slots to nine; one of these slots (extreme right) is
reserved for the power supply. Situated on the
rear panel behind the power supply slot is a power
entry module that includes an on/off switch, fuses,
and a power filter for use with the AC power supply
only. See Figure 1.
Eurocard-style
plug-in
modules
occupy
the
remaining slots.
The standard chassis is constructed of molded
plastic with molded ventilation slots. The 19-inch
rack-mounted unit is constructed of metal.
The Models 441A33, 441A35, and 441A38 are the
computer-controlled versions of the standard
chassis. The back panel of this chassis has one
RS-232 connector and two RS-485 connectors
marked “in” and “out”. Also located on the rear
panel is a cooling fan.
A back plane on the inside rear of the unit unifies
the circuitry, routing it to the power supply.
Individual modules slide into the unit via the slot
divisions and are secured to the inside frame using
mechanical fasteners.
Models 441A42, 441A43, 441A45, and 441A49 are
“slave” racks designed to be controlled by a
“master” rack (441A33, 441A35, and 441A38).
These racks do not have an RS-232 connector, but
only two RS-485 connectors, which may be
connected to either a master, or another slave in a
daisy chain fashion. At least one master must be in
the system if it is desired to use computer control.
Located on the rear panel of these racks is a
cooling fan, which normally is on. If it is desired to
turn off the fan in order to reduce acoustical noise,
a jumper “J2” located on the motherboard must be
removed. In order to access this jumper, the rear
panel must be taken off. The fan may now be
disabled via a command from the host computer
controlling the master. The fan should be disabled
for as short a period as possible to ensure
continuous cooling. Contact the factory for more
details.
1.2.2
AC Power Supply (Model 441A101)
The Model 441A01 is a single-slot, CE marked,
AC-line power supply designed to fit only the
extreme right slot of the PCB Series 440 Modular
chassis. It supplies a maximum of 45 watts of
power and may be used to operate single or
multiple signal conditioning modules housed in the
two-, three-, or nine-wide standard chassis and
optional auxiliary chassis.
The power unit supplies a maximum of 45 watts of
power. Please note that while this unit is rated for
a maximum power of 45 W, CE requirements
mandate that the load not exceed 30 Watts.
Power requirements are found on the Specification
Sheet for the individual module.
To determine the
total power of your particular set-up, add the
powers for all modules. The total must be < 30
watts.
