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LCA PRODUCT DESCRIPTION
The LCA-9PC and LCA-RTC Modules provide low-cost, dedicated signal conditioning
for a single bridge type load cell or torque sensor. Model LCA-9PC comes with DB9
male and female connectors, which require soldering to user-furnished mating female
or male cable connectors. Model LCA-RTC comes with removable screw-clamp
terminal connectors, which accept wires without soldering.
On- board jumper selections include sensitivities from 0.5 mV/V to 10 mV/V, bandwidths
from 100 Hz to 30 kHz, and amplified outputs of 0 to ±5V, 0 to ±10V, 0-16 mA, 0-20 mA
or 4-20 mA. Zero and span adjustments are via precision 25-turn low-tempco metal film
potentiometers.
The units can be operated next to the sensor with 4-wire hookup or at distances up to
1 km (3300 feet) with 6-wire hookup. An onboard 87.325 k
Ω shunt calibration resistor
allows easy calibration at the push of a button. Provision is also made for a user
furnished shunt calibration resistor. Power requirements are 11.8 to 26V DC with load
currents from 10 to 60 mA. The upper current draw applies when the unit provides 10V
DC excitation to a 350 ohm load cell while delivering a 20 mA analog output.
MOUNTING PROVISIONS
1. DIN Rail Mounting of Cased LCA Units
can be via
the 35 mm DIN Rail Mounting Kit (P/N ADR-KIT), as
described in the Accessories section on page 17 of
this manual. The mount is attached to the bottom of
the case by means of four plastic push-in rivets that
come with the kit.
2. Bulkhead Mounting of Cased LCA Units
can be via
four 0.156” (4.0 mm) holes in
the bottom of the case. Please see the Case Dimensions section on page 15 of this
manual. Note that any screw head inside the case can have a maximum height of
only 0.10” (2.5 mm) so as to avoid contact with conductors on the back of the circuit
board. Make sure that the adjustment holes in the top of the case remain accessible.
3. Bulkhead Mounting of LCA Circuit Board
can be via user-furnished standoffs
and two
9/64” (3.5 mm) mounting holes on the circuit board. Please see the Board
Dimensions section on page 16 of this manual. To avoid electrical contact between
the standoffs and live conductors, the circuit board should be sandwiched between
two insulating nylon washers. Since spacing is tight, the diameter of the washers
and mounting nuts at their widest dimension cannot exceed 1/4" (6 mm).
