USH
COMPACT HIGH-CAPACITY COMPRESSION TYPE LOADCELL
OPERATION MANUAL
01AUG2020REV.1.06
1.Product outline
USH series are compact compression type loadcells with high-capacity.
There are suitable for built-in applications.
2.Handling prohibitions and precautions
3.Installation procedure
(1) For loadcell mounting, be sure to use proper screws by the specifications. Screw insertion length should
be around 1.5times longer than diameter of a screw. Screws must be tightened at instructed torque. Use
screw locking adhesive if needed.
Recommended tightening torque.....M2:
0.32 N·m
, M4:
2.7 N·m
(2) The base plate must be made of steel having enough rigidity. Also its flatness should be 0.01mm or less
and surface roughness should be less than Ra3.2.
(3) The load plate must be made of steel having enough rigidity and hardness. Also its flatness should be
0.01mm or less, surface roughness should be less than Ra3.2, and hardness should be more than HRC50.
The loadcell characteristics may be changed with the flatness of the base.
4.Wiring color of loadcell cables
5.Indicator connection
Check the signal name and wiring color before connection.
(1) The cable of USH loadcell has 6 bare wire ends. Therefore USH should be used with an indicator that
accepts 6-wire input. In case USH is used with a 4-wire input indicator, both +EXC and +S wires must be
inserted to +EXC terminal of an indicator, also both -EXC and -S wires must be inserted to -EXC
terminal of an indicator. In this case, sensitivity may change a little.
Please connect SHIELD wire to SHIELD terminal of indicator.
Since load cell main body is insulated from SHIELD cable, make sure main body and indicator ground
point is connected in single-point grounding.
(2) Apply the recommended voltage for the excitation. If the applied voltage exceeds the maximum
excitation voltage, USH may get permanent damage.
(3) To extend loadcell cable, make sure to use a cable with the same diameter or bigger diameter than
standard cable. A voltage drop may occur when small diameter cable (having high resistance) is used,
and it may affect the result of measurement.
Re-calibration with an standard weight could be needed if USH is used with a 4-wire input indicator.
Please consult our sales representative for cable extension.
Prohibitions
Do not disassemble this product.
Avoid dropping or giving a shock to the product.
Precautions
●
Do not install the product in the following environments:
- In an atmosphere with corrosive or combustible gases;
- Locations where temperature or humidity exceeds
specifications;
- Locations subject to drastic temperature fluctuations or
icing and condensation;
- Locations exposed to direct sunlight;
- Locations subject to direct vibration or shock
●
Consult us if this product is to be used under a special
environment.
●
Provide sufficient strength to the installation location.
●
Perform adequate isolation if the product is used in the
following locations:
- Locations subject to noise such as static electricity;
- Locations subject to strong electric field and intense
magnetic field.
●
Perform electric welding before mounting the loadcell.
Take caution not to make current flow in the loadcell if
the welding needs to be performed after mounting.
●
Handle this product as industrial waste when disposing.
Core wire
Signal name / wiring color
+EXC
+S
-S
-EXC
+SIG
-SIG
SHIELD
Six wires
Red
Yellow
Orange
Black
Green
White
Blue
Prohibited actions while operating the product
(Prohibited actions)
Events that may cause injury to personnel or material damage
in case of misuse.
Bolt
Load direction
Load plate
Loadcell
Base plate
There is a hollow at the
bottom of load cell.
For installation, make sure
no load is applied on that area.
6.Calibration
If calibration is needed, do it on indicator. For more information, refer to the manual of indicator.
■
Actual load calibration
In this calibration method, actual load is applied to a loadcell, and the value of the actual load is input using
the keys. Accurate calibration with minimal error can be performed.
Prepare a reference item such as a weight in advance.
■
Equivalent input calibration
In this calibration method, only the rated output value and the rated capacity value of the loadcell are input
using the keys. This method does not involve actual load.
The values are stated on the attached data sheet upon the purchase of loadcell.
7.Trouble shooting
Determine whether the error is occurring on the loadcell side or the indicator side.
Check the damage of USH in the following ways.
(1) In case a load is applied larger than safe overload or a load in unexpected direction is applied to the USH,
make sure to check if it didn’t get damaged after recalibration.
(2) When the reading on indicator is unstable or odd, do an inspection as follows after checking wiring and
precautions.
①
Check the input resistance of loadcell under no-load condition. (bEXC and -EXC)
②
Check the output resistance of loadcell under no-load condition.(bSIG and -SIG)
③
Check the signal output of loadcell (Zero-balance) under no-load condition
In case measured values above are out-of-specification, please consult us.
If no problem found on USH, check the indicator in the following ways.
(1) Disconnect the USH from indicator. Check if the reading on indicator is near 0, while short the input
terSIG and -SIG).
(2) Measure the voltage of the output terEXC and -EXC) of indicator, and verify if the excitation
voltage is applied properly.
For more information, refer to the manual of indicator.
■
Six-wire type loadcell
→
Six-wire type indicator
■
Six-wire type loadcell
→
Four-wire type indicator
＋
EXC
−
S
＋
SIG
−
SIG
SHIELD
＋
S
−
EXC
＋
EXC
−
S
＋
SIG
−
SIG
SHIELD
＋
S
−
EXC
Loadcell side
Indicator side
Loadcell side
Indicator side
㸩
IN
㸫
IN
㸫
OUT
㸩
OUT
＋
EXC
＋
SIG
−
SIG
SHIELD
−
EXC
＋
EXC
−
S
＋
SIG
−
SIG
SHIELD
＋
S
−
EXC
㸩
IN
㸫
IN
㸫
OUT
㸩
OUT
* SHIELD wire is not connected to load cell main body.
7HVWHU
قٔك
قٕك
ق5HGك
ق:KLWHك
ق%ODFNك
ق*UHHQك
ق%OXHك
ق2UDQJHك
ق<HOORZك
㸩
EXC
㸫
S
㸩
SIG
㸫
SIG
SHIELD
㸩
S
㸫
EXC
㸩
IN
㸫
IN
㸫
OUT
㸩
OUT
Disconnect the USH from the
indicator. And verify if the input
resistance of loadcell (bEXC
and -EXC) is within the specification
range under no-load condition.
7HVWHU
قٔك
قٕك
ق5HGك
ق:KLWHك
ق%ODFNك
ق*UHHQك
ق%OXHك
ق2UDQJHك
ق<HOORZك
㸩
EXC
㸫
S
㸩
SIG
㸫
SIG
SHIELD
㸩
S
㸫
EXC
㸩
IN
㸫
IN
㸫
OUT
㸩
OUT
Disconnect the USH from the
indicator. And verify if the output
resistance of loadcell (bSIG
and -SIG) is within the specification
range under no-load condition.
7HVWHU
قٔك
قٕك
,QGLFDWRU
ق5HGك
ق:KLWHك
ق%ODFNك
ق*UHHQك
ق%OXHك
ق2UDQJHك
ق<HOORZك
㸩
EXC
㸫
S
㸩
SIG
㸫
SIG
SHIELD
㸩
S
㸫
EXC
㸩
EXC
㸫
S
㸩
SIG
㸫
SIG
㸩
S
㸫
EXC
㸩
IN
㸫
IN
㸫
OUT
㸩
OUT
Connect the USH with an indicator.
And measure the output voltage
(Vout[mV/V]) under no-load
condition, while an excitation
voltage (Vin[V]) is applied. Verify if
the signal output of loadcell
( [mV/V]) is within the
specification range. (Zero-balance)
Vout
Vin
8.External dimension
9.Specifications
Model
USH-10KN
USH-20KN
USH-50KN
Rated capacity
10
20
50
kN
Rated output
1±20%
mV/V
Safe overload
200
%R.C.
Zero balance
±20
%R.O.
Non-linearity
0.2
%R.O.
Hysteresis
0.15
%R.O.
Repeatability
0.1
%R.O.
Compensated temperature range
-10 to +70
℃
Safe temperature range
-30 to +85
℃
Temperature effect on zero
0.2
%R.O./10
℃
Temperature effect on span
0.2
%R.O./10
℃
Input resistance
Approx. 1000
Ω
Output resistance
Approx. 1000
Ω
Recommended excitation voltage
5
V
Maximum excitation voltage
7.5
V
Insulation resistance (DC50V)
1000 or more
MΩ
Cable
φ
2.5 6-conductor flexible cable (3m)
Cable end: 7 wires
Deflection at rated capacity
0.06
0.07
mm
Natural frequency
20
15
kHz
Loadcell material
Stainless steel
Weight
0.1
0.18
kg
■
USH-10KN, USH-20KN
■
USH-50KN
8QLWPP
Load direction
25
22
ȭ
40
6.1
ȭ
13
SR60
P.C.D.32
120°
3-M4 Depth 6
ȭ
2.5 6-conductor
flexible cable (3m)
Cable end: 7 wires
Load direction
ȭ
26
13
12
SR40
ȭ
8
4.1
P.C.D.22.75
120°
3-M2 Depth 3
ȭ
2.5 6-conductor
flexible cable (3m)
Cable end: 7 wires
International Sales Department
9-11 Nihonbashi Hisamatsu-cho, Chuo-ku, Tokyo 103-0005
Tel: +81-3-3639-6120 Fax: +81-3-3639-6130
Unipulse Corporation
