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CCT-80
Strain Gage Signal Conditioners
M2218/1201
TABLE OF CONTENTS
PAGE
Open the Housing . . . . . . . . . . . . . . . . . . . . . . . . 3
Internal Overview . . . . . . . . . . . . . . . . . . . . . . . . 3
Power Supply module MA . . . . . . . . . . . . . . . . . . 4
Changing the Power Supply . . . . . . . . . . . . . . . . 4
Signal Output module MS . . . . . . . . . . . . . . . . . . 5
Changing the Signal Output . . . . . . . . . . . . . . . . 5
Signal Input, module ME Overview. . . . . . . . . . . 6
CCT-80, Electrical Features (Specifications) . . . 7
Signal Input Range Selection . . . . . . . . . . . . . 8
Adjustment and Calibration Procedure . . . . . 8
Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Mechanical Specifications. . . . . . . . . . . . . . . . . 10
Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2
C
OPEN THE HOUSING
A
d
PROCEDURE
c
1. Insert a screwdriver or similar tool in the
points marked c.
e
c
d
2. Turn the screwdriver until the case walls
begin to separate towards A and B, so the
two side lugs e, are free.
B
e
3. Grab the Signal Conditioner body, at the
points marked d‚ and pull it towards C,
until the two side lugs e are out of their
housing and the internal circuits are visible.
See the sketch below for the disassembly of
the circuit boards.
FIG.1
4. Before reinserting the Signal Conditioner
body into the case, the following must be
checked :
-The front label (blue color) must be in its correct position, with terminals 1 and 7
(power supply) separated from the other terminals.
-The three internal modules must be inserted correctly in their internal case guides.
MA
Power Supply Module
C
INTERNAL OVERVIEW
a
a
A. "ME" Input module.
MP
Input board
B. "MS" Output module.
C. "MA" Power supply module.
D. "MP" Input Board.
FIG.2
A
B
D
PROCEDURE FOR DISASSEMBLY
1. Pull out the "ME" input module towards "a".
2. Pull out the "MS" output module towards "a".
3. Pull out the "MP" input board towards "b".
4. To assemble reverse the procedure.
b
MS Output module
ME Input module
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POWER SUPPLY
RECOMMENDED WIRING
The power supply must be connected to terminals 1 and 7. The characteristics of the power supply
are shown on the side label.
WARNING.- If the power supply is dc voltage, be careful with the polarity indicated for each
terminal.
1
3
4
5
6
H i
INPUT
/
ENTRADA
Power supply
Fuse
OUTPUTS
mA
/
SALIDAS
Vdc
+
-
+
-
Lo
7
9
10 11 12
FIG. 3
PRECAUTIONS
The installation must incorporate safety devices
to protect the operator and the process when
using the Transmitter to control a machine or
process where injury to personnel or damage to
equipment or process, may occur as a result of
failure of the Transmitter.
Power
supply
Fuse
value
230 Vac
115 Vac
48 Vac
24 Vac
24 Vdc
50 mA
100 mA
150 mA
300 mA
300 mA
PROTECTIONS
See on table 1 the recommended value of the
fuse for the different power supply availables.
TABLE 1
CHANGING THE POWER SUPPLY
The unit is not provided with a system to change the power supply. Therefore if the power supply
must be modified to other value, please replace the module MA for another one appropriate to
the new characteristics. Contact your local distributor for instructions.
4
SIGNAL OUTPUT module MS
1
The signal conditioner provides two different analog output
signals, both proportional to the signal input.
3
4
5
6
H i
INPUT / ENTRADA
Output in Current: 4 to 20 mA, terminals 9 - 10
Output in Voltage: 0 to 10 Vdc, terminals 11 - 12
OUTPUTS / SALIDAS
mA
Vdc
Do not use both outputs simultaneously. Only one selection
can be made.
Lo
7
+
9
-
+
-
10 11 12
The side label shows which one is selected.
FIG.5
CHANGING THE SIGNAL OUTPUT
All signal conditioners are delivered as a standard version, with the analog output selected as
4 to 20 mA, unless specified otherwise. To select a 0 to 10 V output, remove jumpers E and
F as shown in Figure 6. Other non-standard output voltage and current ranges may be obtained
by adding and/or replacing resistors given in Tables 2 and 3.
NON STANDARD OUTPUT
CURRENTS
NON STANDARD OUTPUT
VOLTAGES
TABLE 2
TABLE 3
Output
in V.
Value in KΩ for :
Output
in mA.
Value in Ω for :
R29
R30
R31
R32
R18
R24
R25
±10
0 to 1
0 to 5
1 to 5
49.9
-----
-----
-----
-----
-----
-----
100
200
11
----
0 to 5
0 to 10
1 to 5
-----
100
-----
-----
-----
24.9
100
100
100
-----
49.9
124
100
66.5
100 K
-----
0 to 20
-------
"-----" means "Resistor must not be installed"
Jumpers E and F : Closed only if the output is 4 to 20 mA.
F
E
Replace or add the indicated
resistors with the values shown
inTables2and3 forthedesired
output.
R18
R29
R30
FIG.6
R25
R32
R24
R31
5
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.
FIG.7
P1 : Output zero adjustment.
P2 : Gain amplifier adjustment.
1
P1
P2
2
B
A
C
Solder pads on solder side
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
Jumper C if closed
: Gain at maximum level
: Gain at medium level.
Jumpers B and C opened : Gain at minimum level.
6
CCT-80, ELECTRICAL FEATURES
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.
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
0 to 10 Vdc
ACCURACY
RESPONSE TIME
GALVANICISOLATION
R < 600 Ω max. 22 mA ±3%
L
R > 1000 Ω max. 11 V ±3%
L
≤ 0.2 % FS
≤ 250 mS
Input, Output and Power Supply are all isolated
to 2 kVeff. 50 Hz/1 m.
GENERAL SPECIFICATIONS
RIPPLE
BAND PASS
≤ 0.5 %
1.5 Hz (-3 dB)
-30° to +80°C
-10° to +60°C
≤ 0.015 %/°C
115 Vac (±10%) 50/60 Hz
≤ 1.5 VA
STORAGE TEMPERATURE
OPERATING TEMPERATURE
TEMPERATURECOEFFICIENT
STANDARD POWER SUPPLY
POWER CONSUMPTION
TEST VOLTAGE
4 kVeff. 50 Hz/1m.
7
SIGNAL INPUT RANGE SELECTION
The "MP" input board for this signal conditioner,
does not have jumpers because it allows only one
signal input (0 to 20 mV). To calibrate the signal
conditioner, follow the adjustment and calibration
procedure.
"MP" input board
The user can field adjust the tare using the trim-
mer PT1, located on the "MP" input board. See
Fig. 8.
The signal input 0 to 20 mV will be the standard
range for all orders, unless specified otherwise.
PT1
FIG.8
ADJUSTMENT AND CALIBRATION PROCEDURE
To calibrate the signal conditioner, use a calibrator or Vdc source from 0 to 20 mVdc.
1. Open the signal conditioner case. (Fig. 2).
2. Check the "MA" module, if the selected power supply is correct. (Table 1).
3. Connect the calibrator to the signal conditioner terminals 5 - 6.
4. Connect a digital multimeter, to the signal output terminals to be used.
5. Power up the signal conditioner with the correct power supply.
6. Adjust the calibrator until it generates the low signal level (0 Vdc).
7. Turn the "ZERO" trimmer (P1), located on the "ME" input module, until the multimeter
shows the desired low signal output level. (For example: 0 Vdc).
8. Adjust the calibrator until it generates the high signal level.
9. Turn the "GAIN" trimmer (P2), located on the "ME" input module, until the multimeter
shows the desired high output level. (For example: 10 Vdc).
10. Repeat steps 6 to 9, until the two values are correct.
TARE ADJUST PROCEDURE
After the connections between the signal conditioner, load cell and external power supply are
made, connect a multimeter to the output terminals. Do not forget that the load cell must be
free of load.
If the multimeter does not read 0 Vdc or 4 mA, then adjust the trimmer PT1, located on the
"MP" input board.
Check that the high level of the output signal does not change. If it does adjust the GAIN
trimmer (P2) located on the "ME" input module ( see Fig. 7).
8
WIRING
+
CONNECTIONS
6-WIRE
BRIDGE
350 Ω
-
+
-
+10 Vdc
FIG.9
1
3
4
5
6
H i
1
2
3
4
5
6
TARE ADJUST
When internal tare
adjust (on the "ME"
input board ) is not
used, the signal
conditionerterminals
3 and 4, must not be
connected.
INPUT
/
ENTRADA
POWER
SUPPLY
POWER SUPPLY
AC
VOLTAGE
OUTPUTS
SALIDAS
The side label,
shows the type
and value of the
OUTPUTS
mA
/
SALIDAS
Vdc
power supply.
Lo
7
+
-
+
-
POWER SUPPLY
FUENTE ALIMENTACION
9
10 11 12
SIGNALOUTPUT
Current
SIGNALOUTPUT
Voltage
+
FIG.10
350 Ω
-
+
4-WIRE
BRIDGE
-
-
+10 Vdc
1
1
2
3
4
5
6
3
4
5
6
POWER
SUPPLY
H i
POWER SUPPLY
The side label, shows
the type and value of
AC
VOLTAGE
INPUT ENTRADA
/
OUTPUTS
SALIDAS
the power supply.
OUTPUTS
mA
/
SALIDAS
Vdc
POWER SUPPLY
FUENTE ALIMENTACION
Lo
7
+
-
+
-
9
10 11 12
SIGNALOUTPUT
Current
SIGNALOUTPUT
Voltage
9
MECHANICAL
DIMENSIONS
1
3
4
5
6
H i
INPUT
/
ENTRADA
75 mm
(2.952")
36 mm
(1.417")
OUTPUTS
mA
/
SALIDAS
Vdc
Lo
7
+
9
-
+
-
10 11 12
45 mm
(1.771")
110 mm
(4.33")
TECHNICAL DATA
WEIGHT . . . . . . . . . . . . . . . . . . . 270 g.
HOUSING BASE . . . . . . . . . . . . Polycarbonate, RAL 7032, UL 94 V-1 light grey, IP-40
TERMINAL HOUSING, COVER
AND BLIND PLUGS . . . . . . . . . . Polycarbonate, UL 94 V-2 dark grey, IP-20
2
WIRE CROSS SECTION : . . . . . 4 mm
Provided with a snap fastener for attaching to DIN 46277 and DIN EN 50022 (35 x 7.5 mm)
assembly rails.
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NOTES
11
M ADE
IN
USA
WARRANTY/DIS CLAIMER
OMEGA ENGINEERING, INC. warrants this unit to be free of defects in m aterials and
workm anship for a period of 1 3 m o n t h s from date of purchase. OMEGA Warranty adds an
additional one (1) m onth grace period to the norm al o n e (1 ) ye a r p ro d u c t w a rra n t y to
co ve r h a n d lin g a n d s h ip p in g tim e . Th is e n s u re s th a t OMEGA’s cu s to m e rs re ce ive
m axim um coverage on each product.
If the unit should m alfunction, it m ust be returned to the factory for evaluation. OMEGA’s
Custom er Service Departm ent will issue an Authorized Return (AR) num ber im m ediately
upon phone or written request. Upon exam ination by OMEGA, if the unit is found to be
defective it will be repaired or replaced at no charge. OMEGA’s WARRANTY does not apply
to d e fe cts re s u ltin g fro m a n y a ctio n o f th e p u rch a s e r, in clu d in g b u t n o t lim ite d to
m ishandling, im proper interfacing, operation outside of design lim its, im proper repair, or
unauthorized m odification. This WARRANTY is VOID if the unit shows evidence of having
been tam pered with or shows evidence of being dam aged as a result of excessive corrosion;
or current, heat, m oisture or vibration; im proper specification; m isapplication; m isuse or
other operating conditions outside of OMEGA’s control. Com ponents which wear are not
warranted, including but not lim ited to contact points, fuses, and triacs.
OMEGA is pleased to offer suggestions on the use of its various products. How ever,
OMEGA n e it h e r a s s u m e s re s p o n s ib ilit y fo r a n y o m is s io n s o r e rro rs n o r a s s u m e s
liability for any dam ages that result from the use of its products in accordance w ith
inform ation provided by OMEGA, either verbal or w ritten. OMEGA w arrants only that
the parts m anufactured by it w ill be as specified and free of defects. OMEGA MAKES
NO OTHER WARRANTIES OR REP RES ENTATIONS OF ANY KIND WHATS OEVER,
EXPRESSED OR IMPLIED, EXCEPT THAT OF TITLE, AND ALL IMPLIED WARRANTIES
IN C LU D IN G A N Y WA RRA N TY O F M ERC HA N TA BILITY A N D FITN ES S FO R
A
PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. LIMITATION OF LIABILITY: The
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w it h re s p e c t t o t h is o rd e r, w h e t h e r b a s e d o n c o n t ra c t , w a rra n t y, n e g lig e n c e ,
indem nification, strict liability or otherw ise, shall not exceed the purchase price of the
c o m p o n e n t u p o n w h ic h lia b ilit y is b a s e d . In n o e ve n t s h a ll OMEGA b e lia b le fo r
consequential, incidental or special dam ages.
CONDITIONS: Equipm ent sold by OMEGA is not intended to be used, nor shall it be used: (1)
as
a
“Basic Com ponent” under 10 CFR 21 (NRC), used in or with any nuclear installation or
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RETURN REQUES TS / INQUIRIES
Dire ct a ll w a rra n ty a n d re p a ir re q u e s ts /in q u irie s to th e OMEGA Cu s to m e r S e rvice
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OBTAIN AN AUTHORIZED RETURN (AR) NUMBER FROM OMEGA’S CUSTOMER SERVICE
DEPARTMENT (IN ORDER TO AVOID PROCESSING DELAYS). The assigned AR num ber
should then be m arked on the outside of the return package and on any correspondence.
The purchaser is responsible for shipping charges, freight, insurance and proper packaging
to prevent breakage in transit.
FOR WARRANTY RETURNS, please have
the following inform ation available BEFORE
contacting OMEGA:
1. P.O. num ber under which the product
was PURCHASED,
2. Model and serial num ber of the product
under warranty, and
FOR NON-WARRANTY REPAIRS, consult
OMEGA for current repair charges. Have
the following inform ation available
BEFORE contacting OMEGA:
1. P.O. num ber to cover the COST
of the repair,
2. Model and serial num ber of product, and
3. Repair instructions and/or specific
problem s relative to the product.
3. Repair instructions and/or specific
problem s relative to the product.
OMEGA’s policy is to m ake running changes, not m odel changes, whenever an im provem ent is possible.
This affords our custom ers the latest in technology and engineering.
OMEGA is
a
registered tradem ark of OMEGA ENGINEERING, INC.
©
Co p yrig h t 1996 OMEGA ENGINEERING, INC. All rig h ts re s e rve d . Th is d o cu m e n t m a y n o t b e co p ie d ,
photocopied, reproduced, translated, or reduced to any electronic m edium or m achine-readable form , in whole or
in part, without prior written consent of OMEGA ENGINEERING, INC.
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