Omega Vehicle Security CCT-80 Series - Manual (Page 7)

INPUT
STANDARD SIGNAL 20 mV
TARE by internal trimmer PT1, located on the "MP"
input board
OUTPUT
0 to 20 mA or 4 to 20 mA R
L
< 600 Ω max. 22 mA ±3%
0 to 10 Vdc R
L
> 1000 Ω max. 11 V ±3%
ACCURACY ≤ 0.2 % FS
RESPONSE TIME ≤ 250 mS
GALVANIC ISOLATION Input, Output and Power Supply are all isolated
to 2 kVeff
.
50 Hz/1 m.
GENERAL SPECIFICATIONS
RIPPLE ≤ 0.5 %
BAND PASS 1.5 Hz (-3 dB)
STORAGE TEMPERATURE -30° to +80°C
OPERATING TEMPERATURE -10° to +60°C
TEMPERATURE COEFFICIENT ≤ 0.015 %/°C
STANDARD POWER SUPPLY 115 Vac (±10%) 50/60 Hz
POWER CONSUMPTION ≤ 1.5 VA
TEST VOLTAGE 4 kVeff. 50 Hz/1m.
B
2
1
C A
FIG.7
Solder pads on solder side
P1 : Output zero adjustment.
P2 : Gain amplifier adjustment.
P2 P1
OFFSET ADJUST
Solder pad 1 if closed : Adjust the low range level of the output (Offset positive coarse).
Solder pad 2 if closed : Adjust the low range level of the output (Offset negative coarse).
Jumper A if closed
: Adjust the low range level of the output (Offset negative fine).
AMPLIFIER GAIN
Jumper B if closed : Gain at maximum level
Jumper C if closed : Gain at medium level.
Jumpers B and C opened : Gain at minimum level.
SIGNAL INPUT, module ME
OVERVIEW
This module together with the "MP" input board, performs the signal conditioning (see Fig. 2).
This module contains the trimmers and jumpers for the amplifier gain and the low level output
(offset).
The signal input connections are made at Terminals 3, 4, 5 and 6.
This signal conditioner provides connection to 4- or 6-wire strain-gages (load-cells), which
provide a nominal of 2 mV/V or 3 mV/V output with 350
Ω impedance. See the Connections
Section.
The signal conditioner does not provides the bridge excitation voltage, therefore is necessary
to use an external auxiliary power supply. It is advised that you use the model FAR-1 power
supply, which senses the excitation voltage and compensates the errors due to lead
resistance.
The FAR-1 provides a regulated 10 Vdc output.
The CCT-80 has an internal circuit which provides the user with tare adjust and compensation.
See the tare paragraph.
CCT-80, ELECTRICAL FEATURES
7 6