Minebea CSA-521 User manual

Transmitter
CSA-521
Instruction Manual
EN294-1145-G

I
FOREWORD
Thank you very much for your purchasing our Transmitter CSA−521.
This manual explains installation procedures and connecting method and also operating
method for the Transmitter CSA−521. Make use of it properly after reading through the
manual carefully.
Be sure to deliver the manual to the end user. Moreover, the end user should keep the
manual at hand after reading it over.

II
Marks and arrangements used in this manual
The following marks are attached to the explanation on the matters that indicate “Don’t do
this.”, “Take care.” and “For reference”.
Be sure to read these items where these marks are attached.
Warning ●Warning may cause injury or accident that may harm to the operator.
Don’t do these things described here.
●Caution during operation and working.
Be sure to read the item to prevent malfunction.
Mark during operation.
●Press the switch.

III
For safe operation
Be sure to read this instruction manual before use.
1. Installation place
●Use the instrument where the temperature/humidity specifies with the range as follows：
Environmental temperature ：−10 ℃to 50 ℃
Environmental humidity ：Less than 85 %R.H. (Non condensing)
(1) Location where installation is not allowed.
Warning ●Don’t locate the instrument on the places as follows :
It may cause an unexpected faulty in the instrument.
DDo not locate the instrument in direct and/or high temperature area.
DDo not use the instrument in a high humid area.
DDo not install the instrument where there are vibrations and shocks.
DDo not use the instrument where there is excess of dusts and fine particles.
DDo not use the instrument where there are corrosive gas and salt and like
that.
DDo not install the instrument where there is rapid change of temperature
and humidity.
DDo not install the instrument near the devices that are magnetized or
generate an electromagnetic field.
DDo not install the instrument where the instrument may be affected by
radioactivity or radial rays.
DAvoid the location where chemical reaction may take place such as in a
laboratory, or like that.

IV
(2) Installation
●When installing the instrument, install as referring to the following figures and secure
the space around the instrument.
Each dimensions of the instrument and required dimensions for the environmental
spaces are as follows:
Outline dimensions
Unit：mm
Surface of board Side face
Height of board
Max. 20 1.6
80
70
60 70

V
2. Power supply
Warning ●Be sure to check that the power supply is off in connecting each cable. If the work is
done while the power is on, there may have the case that electric shock to the operator
or even may have damage to the instrument.
Warning ●Before supplying the power, check that the indication of power supply voltage
/specifications for the instrument and the power going to supply should be the same.
If they are not equal, contact us.
If you use the instrument without checking them, it may cause a damage in the
instrument or electric shock to the operator.
●Earth wire should be grounded securely.
When earth wire is not connected, it may cause a malfunction of the instrument or
electric shock to the operator.
3. Application note
Warning ●Before using a new instrument or exchanging the strain gage applied transducer for a
new one, be sure to make calibration. If calibration will not be made, the correct
measuring results may not be obtained nor which may cause malfunction in the
instrument and there may exist damage in peripheral equipments.
Besides, even though calibration has been made, there may occur the similar case when
the results are not correct, so make calibration, again.
Warning ●In case of using the instrument, check that the connections are executed properly. If not
connected properly, the correct measuring result will not be obtained, nor it may cause
malfunctions of the instrument, damage to the peripheral equipments or even more
serious accidents.
Warning ●When change of setting is made carelessly on the instrument during measurement,
correct measured results may not be obtained and it may cause malfunction in the
instrument and even have the possibility of damage in peripheral instruments.
Warning ●Do not shock the instrument such as throwing something on it.
If neglected, it may cause destruction of the parts and damage to the electrical circuits.

VI
History of revision
Date
Instruction manual No.
Details of revised point
Dec. 2001
DRW. NO.EN294-1145
First Version
Apr. 2002
DRW. NO.EN294-1145-A
Due to ECN No.FN02−02045
−Addition −
4−2−2. 3. Warning “～. The input range of this
instrument is 0.5 mV/V to 1.5 mV/V.”
6−1. “ ・Input range 0.5 mV/V to 1.5 mV/V”
−Correction −
6−2. ・Weight Approx.100 g →Approx.50 g
Apr. 2005
DRW.No.EN294-1145-B
Due to ECN No.FN05−02035
−Addition −
At the warning column in the wiring section, the clause of
”As there is a case which standard wiring color is different,
please confirm the inspection data sheet of the load cell
being used.” is added.
Feb. 2010
DRW.No.EN294-1145-C
Due to ECN No.FN10−02026
−Change −
Front cover’s logo is changed.
Oct. 2010
DRW.No.EN294-1145-D
Due to ECN No.FN10−02140
−Change −
Minebea logo is changed.
Jun. 2012
DRW.No.EN294-1145-E
Due to ECN No.FN10−02140−D
−Change −
Minebea logo is changed.
Feb. 2013
DRW.No.EN294-1145-F
Due to ECN No.FN13−02032
−Addition −
6−3.Standard specifications at the time of shipment
“10 V output at the input of 1 mV/V”
Feb. 2018
DRW.No.EN294-1145-G
Due to ECN FN17-02017
・Delete the company name in the cover page.
・Delete the company name in the contents.

INDEX
Forwards Ⅰ....................................................................
Marks and arrangements used in this manual Ⅱ....................................
For safe operation Ⅲ.............................................................
1. Installation place Ⅲ.........................................................
2. Power supply Ⅴ............................................................
3. Application note Ⅴ..........................................................
History of revision Ⅵ............................................................
1. General 1.................................................................
2. Name and function of each point 1..........................................
3. Connecting method 2......................................................
3−1. Layout of the terminal boards 2.........................................
3−2. Note on connection 2...................................................
3−3. Connection 3..........................................................
3−3−1. Connection with strain gage applied transducers 3...................
3−3−2. Connection of voltage output 5....................................
3−3−3. Connection with the power supply and the earth 6...................
4. Calibration procedures 7...................................................
4−1. Preparations 7........................................................
4−2. Calibration procedures 7...............................................
4−2−1. Calibration by the actual load 7....................................
4−2−2. Electronic calibration by CALIB input 8............................
4−3. Zero adjustment by mounting resistance 10................................
4−3−1. Mounting the resistance 10........................................
4−3−2. Check the initial load 11...........................................
5. Trouble shooting 13........................................................
5−1. Execute trouble shooting 14.............................................
6. Specifications 19...........................................................
6−1. Specifications 19........................................................
6−2. General specifications 19................................................
6−3. Standard specifications at the time of shipment 19.........................
6−4. Accessories 19..........................................................
7. Warranty 20................................................................
7−1. Warranty 20...........................................................
7−2. Repair 20..............................................................

1
1. General
This instrument is a transmitter for the application of strain gage applied transducer.
It can obtain the analog output corresponding to the load, pressure, and the torque, etc., by amplifying
the output of various strain gage applied transducers.
2. Name and function of each point
①②
④
③
1“ZERO” trimmer
Trimmer for the zero point adjustment.
2“SPAN” trimmer
Trimmer for the amplification degree adjustment.
3“CALIB” switch
Used when the CALIB value is turned on and off.
4Terminals
DC power supply, the earthing conductor, the voltage output signal line, and the strain gage
applied transducer are connected.

2
3. Connecting method
3−1. Layout of the terminal boards
There is the terminal boards, which has 10 points of terminals.
Layout of terminal boards are shown in the following figure.：
●Terminals(CN1)
Name of
terminals Description Applications
1A Bridge power supply(＋)
2B Amplifier input(−)
3C Bridge power supply(−)Strain gage applied transducer
4D Amplifier input(＋)
5E Shield
6V＋Voltage output terminal(＋)
V
oltage
output
7V−Voltage output terminal(−)
V
o
l
tage output
8F. G . Grounding terminal
9DC24 V(＋) Power supply input terminal(＋)Power supply
10 DC0 V(−) Power supply input terminal(−)
pp y
●“V−” of voltage output terminal and “DC0 V (−)” of power supply input terminal are
insulated.
●“C” of bridge power supply (−) and “V−” of voltage output terminal are connected
internally.
3−2. Note on connection
Warning ●In case of connection with the instrument, keep strictly to the following items. If
neglected, it may cause an unexpected failure or a damage to the instrument.
DBe sure to set the power supply to OFF, when the connection is made.
DSince the terminal boards at front of the instrument is made of resin, take care not to drop
it down or not to apply strong impact.
DThe electric wire which suits the terminal block of this unit is 0.08 mm2/AWG28〜2.5
mm2/AWG12.
DThe electric wire bare length is 5 mm to 6 mm.
DConnecting cable with the instrument should be away from the noise source such as power
supply line and/or I/O line for control and so on as far as possible.
DConduit wiring should be the type of exclusive one, and avoid using with another line
together.
DAll of the connections should be executed securely by referring to the Instruction manual
for the instrument.

3
3−3. Connection
※1 When tension is applied with the application of tension type or universal (compression
/tension) type of load cell, and display of “+” direction is required, connect “Green”
with Terminal No.4 and “Blue” with Terminal No.2 individually. As there is a case
which standard wiring color is different, please confirm the inspection data sheet of the
load cell being used.
※2 When the length of CAB−502 is more than 30 m totally, there may have the case that
the accuracy is out of warranty because the resistance of cable makes the input voltage
of the instrument decreased.
※3 When the length of CAB−502 is more than 10 m totally, or the zener barrier is used in
the system, CALIB is not applicable.
3−3−1. Connection with strain gage applied transducers
The instrument can connect with strain gage applied transducers, such as load cell, pressure
transducer and so on. Here, we will describe the example of connections with load cell, so the
connection with another type of strain gage applied transducers shall be proceeded in the same
way.
1Connection with 1 piece of load cell and CSA−521
3m
WHT BLU ※1 YEL(Shield) GRN ※1 RED

4
2Connection with 1 piece of load cell and a junction box for extension use(B−304) and
CSD−521
Junction box
B−304
CAB−502
3m
WHT BLU ※1 YEL(Shield) GRN ※1 RED
※2(The length of CAB−502 is within 30 m totally.)
Internal wiring diagram of B−304
to CSA−521
to load cell
RED WHTBLU GRN YEL(Shield)
Terminal pitch 9.5 mm
Suitable crimp type terminal lugs
：1.25−4or2−4
RED WHTBLU GRN
YEL(Shield)

5
3−3−2. Connection of voltage output
Connections with voltage output should be made as the following figure.
＋
−
Shield
V
Warning ●Connections with voltage outputs should be made securely according to the figures and
also within specified load resistance.
If neglected, it may cause an unexpected failure and/or malfunction to the instrument.
●For the connections with voltage outputs, be sure to apply shielded cable, and the
shielded cable should be connected with the F.G. terminal of the instrument. If not
connected, it may cause malfunction due to the effects from external noises and so on.

6
3−3−3. Connection with the power supply and the earth
Connections with the power supply and the earth should be made as the following figure.
Grounding should be the D class with single earth.
Power supply voltage DC24 V (DC18 V to DC36 V)
Power consumption Within approx.100 mA
D class with single earth
DC24 V
(DC18 V to DC36 V)
＋
−
Warning ●Connections with the power supply and the earth should be made securely according to
the figures and also within the rated capacity of the instrument. If neglected, it may
cause an unexpected cause of failure.
●Grounding should be the D class with single earth. If neglected, it may cause an
unexpected malfunction due to the effects of noise from other equipments.

7
4. Calibration procedures
Warning ●Before using the new instrument or after exchanging the strain gage applied transducer
with a new one, be sure to make calibration.
If calibration is not made, correct measured results may not be obtained, or it may cause
malfunction to the instrument and it may damage the peripheral equipment.
Moreover, even if calibration has made, there may occur the similar case as above when
the result is not correct. So make precise calibration again.
4−1. Preparations
According to the Chapter 3. Connecting method, connect the instrument and the strain gage
applied transducer properly, then supply the power.
4−2. Calibration procedures
Load calibration procedures for the instrument are two as follows:
1Calibration by the actual load
2Electronic calibration by CALIB input.
●The accuracy of calibration obtained from ①is 1/500 or so.
In the following paragraphs, we will describe each calibration procedure by showing the examples
with load cell applied.
4−2−1. Calibration by the actual load
Procedures
1
Set the load cell to the condition at initial load
(tare weight).
When the initial load (tare weight) is exceeding
the ±0.25 mV/V at the input conversion, cancel
the initial load (tare weight) referring to the
paragraph 4−3.
ZERO trimmer SPAN trimmer
2
ZERO adjustment
Adjust the voltage output value to 0.000 V with
“ZERO” trimmer.
3
SPAN adjustment
Put the standard load such as weights (use it as
near rated capacity as possible) on the load cell,
and adjusts the “SPAN” trimmer to become the
voltage output value to be set.
4
Zero adjustment
After removing the standard weight set on step 3,
confirm the voltage output value to be at 0.000 V.
If not, return to the step 2.
5
Complete
the
calibration
5
C
omp
l
e
t
e
th
eca
lib
ra
ti
on.

8
4−2−2. Electronic calibration by CALIB input
Procedures
1
Set the load cell in the condition of the initial
load (tare weight).
When the initial load (tare weight) is exceeding
±0.25 mV/V at the input conversion, cancel the
initial load (tare weight) referring to the
paragraph 4−3.
ZERO trimmer SPAN trimmer
2
ZERO adjustment
Adjust the voltage output value to become at
0.000 V with ZERO trimmer.
2

9
Procedures
3
(Load cell output value at Max. load)
(Rated output value of load cell))
×(Max. load value)
(Rate load value of load cell)
3 mV/V ×0.34 t
1t
1.02 mV/V
(Voltage output value corresponding to CALIB
value)
(Voltage output value at Max. load)
×(CALIB value)
(Load cell output value at Max. load)
10.000 V ×0.5 mV/V
1.02 mV/V
4.902 V
Therefore, the voltage output value in turning on
“CALIB” switch is adjusted to 4.902 V
＝
SPAN adjustment
Turn on the “CALIB” switch.
Be able to get the output equivalent to the
calibration value at 0.5 mV/V±0.001 mV/V
“CALIB” switch is turned on by sliding up.
The voltage output value corresponding to the
CALIB value is calculated from the rated load
value, the rated output value, the maximum load
value, and the voltage output value of the
connected load cell at that time.
Adjust the voltage output value to become the
calculated value by using the “SPAN” trimmer.
Calculation example)
The calculation example when the voltage
output of 10.000 V is required at the maximum
load of 0.34 t in the condition of using one point
of load cell with the rated capacity 1 t, rated
output 3 mV/V.
Warning ：Set the rated output value of the
load cell for calculation to the written value
of each inspection data sheet. The input
range of this instrument is 0.5 mV/V to 1.5
mV/V.
＝
＝
＝
≒
＝
Rated load value of the load cell 1 t
Rated output value of the load cell 3 mV/V
The maximum load value 0.34 t
Voltage output value at Max. load 10.000 V
CALIB value 0.5 mV/V
4
ZERO adjustment
Set the CALIB switch to OFF.
Confirm the voltage output value to 0.000 V.
If not, return to the step 2.
5Calibration is completed.

10
4−3. Zero adjustment by mounting resistance
4−3−1. Mounting the resistance
The zero point adjustable range of this transmitter is 0.25 mV/V(±500 μst) or equivalent at
the input conversion. Therefore, when an initial load exceeds this range, it is not possible to
adjust it by this unit. In this case, mount resistance Rz on R22 (When an initial load is a plus) or
R23 (When an initial load is a minus), and cancel an initial load as shown in the figure below.
Moreover, because the resistance used exerts the influence directly on accuracy, resistance
temperature coefficient less than 50 ppm/℃is recommended. If the one with more excellent
resistance temperature coefficient is used, the influence on accuracy by the temperature
becomes small when used in the environment with a large temperature change.
The example of resistance for compensation corresponding to the input conversion strain is
shown on the next page. However, the error is actually caused with the rose etc. of the I/O
resistance of an actual strain gage applied transducer because this resistance is a theoretical
value. Please think the standard to the end.
R22(Unmounting)
R22
When the initial load is in plus
Rz is mounted on R22 on the P.C.board.
Rz
When the initial load is in minus
Rz is mounted on R23 on the P.C.board.
R23(Unmounting)
R23
Rz