Daiichi Electronics VETT2-91A User manual

Q-222-034
INSTRUCTION MANUAL
AC VOLTAGE TRANSDUCER
VETT2-91A
〔 MODEL B 〕

Q-222-034
1
Introduction
Thank you for purchase of DAIICHI ELECTRONICS product.
Please read this instruction manual carefully before use. Keep this manual for future reference.
Please contact with us in case this manual is lost or damaged.
Safety precautions
 Environment conditions
 Please be sure to use this product in a place that meets the following conditions.
In places that do not meet this condition, malfunctions and failures, and performance and product
life may be reduced.
・Within the range of ambient temperature -10 to 55℃, humidity 5 to 90% RH.
・Environment with low corrosive gas, dust, salt and oil smoke. (Corrosive gas：SO2
/ H2S, etc.)
・Environment that is not affected by vibration or shock.
・Environment with less external noise.
・Altitude 2000m or less.
 If the input to this product is an inverter output (cycle control, SCR phase angle control, PWM control,
etc.), the measurement error will be large.
 Outdoor use conditions
 These products are not a dust proof, water proof, and splash proof construction.
Please avoid the place where dust is generated, and install it in a place where it will not be exposed
to rain or water droplets. (Protection class IP30)
 Please do not install in the place where sunlight hits directly.
Discoloration and degradation of a name plate, and deformation of the case by the surface temperature
rise may occur.
 If the average daily temperature around this product exceeds 40℃, the service life may be shortened.
 Mounting and wiring
Please refer to this instruction manual for mounting and the wiring.
 Please refer to connection diagram for the wiring.
 Please avoid hot line work.
 Please use an electrical wire size suitable with the rated current.
 Please check the tightening of the screw.
 Please attach the terminal cover to prevent electric shock.
 Maintenance and inspection
 Inspection during energization is dangerous.
 This product has no parts to replace during regular inspections.
 Check that the wiring and screws are not loose.
 Please wipe off lightly with the dry soft cloth. Please do not use the organic solvent, chemicals,
cleaners, etc., such as an alcohol, for cleaning.
 Storage
Please store in a place that meets the following conditions.
 The ambient temperature within -40 to +70℃ (storage temperature), humidity 5 to 90% RH.
 Daily average temperature 40℃ or less.
 Places free of dust, corrosive gas, salt and oily smoke.
 Location that is not affected by vibration and shock.
 Aluminum electrolytic capacitors are used in products. Please energize the power supply within one
year after purchase.

Q-222-034
2
 Countermeasures against troubles
If trouble occurs within the warranty period, DAIICHI ELECTRONICS will repairs this product.
 Disposal
Please dispose this product as industrial waste (non-combustible).
Mercury parts and a nickel-cadmium battery are not used for this product.
 Warranty period
The warranty period of the product is one year after the date of delivery.
 Warranty scope
In the case that a defect is found in our product during the warranty period due to our responsibility,
we will replace the defective part and repair.
However, we will not be liable if the faults or defects are under any of the following items.
● When the faults or defects are resulted from the modification or repair carried out by any other entity
than our company.
● Failure caused by violating various conditions regarding use, storage, etc. specified by the supplier.
● When the faults or defects are caused by a reason not belongs to purchased or delivered products.
● Damage or malfunction due to relocation or other transportation, movement or dropping.
● In case that the faults or defects are resulted from force majeure such as fire or abnormal voltage
and natural calamity or disaster.
Our company shall not be liable for compensation of damages caused by any reason which is not our
responsibility, loss opportunity, loss profits incurred to the user, special damages and consequential
damages whether foreseeable or not, or damages not relating to our products.
 Replacement cycle of the product
We recommend updating the product for 10 years as a rough standard.
 Change of instruction manual written contents
This instruction manual changes written contents without a notice by product improvement etc.

Q-222-034
3
Contents
Safety precautions ･････････････････････････････････････････････････････････ 1
1. Features of product ･････････････････････････････････････････････････････ 4
2. Outline dimension ･･･････････････････････････････････････････････････････ 4
3. Bundled items ･･･････････････････････････････････････････････････････････ 4
4. Mounting method ･････････････････････････････････････････････････････････ 4
5. Connection ･･････････････････････････････････････････････････････････････ 6
6. Handling explanation ････････････････････････････････････････････････････ 6
7. Specification
7.1 Rating ･･････････････････････････････････････････････････････････････ 7
7.2 Performance ･････････････････････････････････････････････････････････ 7
7.3 Electrical strength, Mechanical strength ････････････････････････････ 8
7.4 Noise immunity ･･････････････････････････････････････････････････････ 8
7.5 EMC ･････････････････････････････････････････････････････････････････ 9
7.6 Structure and environmental conditions ･･････････････････････････････ 10
7.7 Technical standards ･････････････････････････････････････････････････ 10
8. Input and output relationship ･･･････････････････････････････････････････ 10
9. Calibration ･････････････････････････････････････････････････････････････ 11
10. Type composition ･･･････････････････････････････････････････････････････ 11

Q-222-034
4
1. Features of product
 Complied to JIS C 1111：2019 and IEC 60688：2012
 Free power supply specifications compatible with 80 to 264 VAC and 80 to 264 VDC, and 24 VDC/48 VDC
power supply specifications are available.
 Can also be used for distorted waveforms and SCR waveforms.
 Power consumption and weight have been reduced by about 50% compared to our conventional products.
 Compatible with two types of mounting methods for IEC/DIN rail mounting and wall mounting.
2. Outline dimension
Please refer to the wiring diagram for the terminal arrangement.
Terminal cover
(With VR cap)
(With VR cap)
BIAS adjustment VR
MAX. adjustment VR
7-M4screw
110
92
28
5
40
120
130
1
(12.5)
7
1
Note(１) Dimensions when IEC/DIN rail (height 15mm) is installed. (Please use a rail with a width of 35mm)
The terminal cover is standard equipment.
3. Bundled items
① Inspection certificate：1 (Packed in an envelope)
② Terminal screw in a bag. M4 screw 7-piece set：1
4. Mounting method
Please install indoors in a place with low mechanical vibration, dust, and corrosive gas.
And, please select indoors that are not affected by a strong electromagnetic field by large current bus,
saturable reactor etc. in the vicinity. There is no restriction on mounting position.
Mounting can be done on 35mm width DIN rail mounting or screw mounting.
For screw mounting, please install with M4 screw or M5 screw. (However, the screw is not attached.
The tightening torque of a screw, M4：1.00 to 1.30N･m, M5：2.0 to 2.5N･m)
There is no particular rule for the side-by-side spacing.
Considering heat dissipation and wiring space, please leave 90mm or more space between the top and bottom.
Please leave space between terminal and metal panel for 10mm or more.
<Caution> Be sure to turn off the power and input signals before installing or removing the product to
prevent danger.

Q-222-034
5
Combination mounting dimension example (unit：mm)
■ Screw mounting ■ IEC/DIN rail mounting
■ How to install this product in a IEC / DIN rail.
The claw of the upside of the slot for rail mounting in the bottom of this product is put in a rail.
This product is fixable by pushing in the direction of an arrow below.
35mm width DIN rail
Slider
■ How to remove this product from the IEC / DIN rail.
Please insert a flathead screwdriver in the hole where a slider is square. Next, a slider is lowered in the
direction of an arrow. This product can be removed from the rail by pulling it up in the direction of the
arrow. However, the case may be damaged if this product is pulled up without lowering a slider completely.
Slider
Minus screwdriver
② ①
①：40mm width transducer.
②：56mm width transducer.
Please use rail of IEC, DIN technical standard 35mm width rail
(strong type).
《Recommendation product》 Fuji Electric Co., Ltd.
TH35-15AL

Q-222-034
6
5. Connection
Refer to the terminal name on the front name plate of the main unit, and connect according to the wiring
diagram below or the wiring diagram name plate on the lower side of the main unit.
Use the included M4 screws to connect the auxiliary power supply, input voltage, input current, output,
and ground terminals.
〔Applicable solderless terminal〕
Solderless terminal for M4 screw
Outer diameter of terminal, 8.5mm or less
Tightening torque：1.0 to 1.3 N･m
■ Connection diagram
・Grounding is class D grounding (grounding resistance 100Ω or less).
・If there is a power line that causes noise or a sharp voltage
fluctuation, separate the output wiring as much as possible.
In addition, use twisted cable or shielded twisted cable.
・This product will not be damaged even if the output terminal is
left open in the current output specifications.
・After completing the wiring work, attach the terminal cover.
6. Handling explanation
Please handle it correctly after paying attention to the following points.
(1) When applying the auxiliary power supply and input, check that the voltage and input signal of the
auxiliary power supply conform to the specifications of this product.
(2）Make sure that the external wiring is connected to the specified terminal position (listed on the
nameplate).
(3）Please use the output load within the output load range indicated on the name plate.
If the output load range is exceeded, not only will the output error, but the product will be
burdened. Especially for voltage output products, do not short-circuit the output.
This product will not be damaged even if the output terminal is left open in the current output
specifications. However, a voltage of about 15V is generated.
(4）The output adjustment range is BIAS：±5% of the output span, MAX.：±5% of the output span.
Use only when adjustment is required for matching with connected devices.
( )
S1 S2 ( )
＋
～－
～
OUTPUT
( )
＋
A
SUPPLY
AUX.
EB
( )
－
LOAD
U
1
2
1
2
Input voltage terminal
1, 2
Auxiliary supply terminal
S1( ), S2( )
Ground terminal
E
＋
～ －
～
Output terminal
A(
＋ ), B( － )

Q-222-034
7
7. Specification
7.1 Rating
Item Specification
Input Voltage AC0 to 150V 50/60Hz (２) Please specify AC0 to 300V 50/60Hz
Power consumption 0.3VA (AC150V), 0.9VA (AC300V)
Output (Output load range)
DC0 to 5V (600Ω or more)
(２) Please specify
DC1 to 5V (600Ω or more)
DC0 to 1mA (10kΩ or less)
DC4 to 20mA (550Ω or less)
Auxiliary
supply
Power supply range
AC80 to 264V 50/60Hz AC/DC power supply Please specify
DC80 to 264V
DC20 to 57V
Power consumption 2.5VA (AC100/110V) , 3.5VA (AC200/220V)
1.5W (DC100/110V, DC200/220V, DC24V, DC48V)
Inrush current
(Time constant)
AC110V：1.3A or less（2.8ms)
AC220V：2.5A or less（2.8ms)
DC110V：0.9A or less（2.8ms)
DC220V：1.8A or less（2.8ms)
DC24V ：1.5A or less (5.3ms)
DC48V ：3.1A or less (5.3ms)
Note(２) Refer to the specification code for other ratings.
7.2 Performance
Item Specification
Class index 0.5
Response time 1 second or less
Ripple 1%p-p or less
Fluctuation value
of influence due
to ambient
temperature
Usage group I
・Within the class index at 10 to 35℃
・Within two times the class index at 0 to 45℃
・Within three times the class index at -10 to 55℃
Fluctuation value
of influence due
to input amount
distortion
Within two times the class index at 20% of the 3rd harmonic
The error may be large in the measurement at the following inverter output.
・Cycle control
・PWM inverter
・SCR phase angle control
Adjustment range The output adjustment range is BIAS：±5% of the output span, MAX.：±5% of the output
span. Use only when adjustment is required for matching with connected devices.
Low input cut None
Output limiter 0%, 120% (% of output span)
・For 4 to 20mA output, 4mA, 23.2mA
Operation method RMS value computing type

Q-222-034
8
7.3 Electrical strength, Mechanical strength
Item Specification
Insulation
resistance
Between electric circuit and case (ground).
50MΩ or more at DC500V
Between auxiliary supply terminals and input, output
terminals.
Between input terminals and output terminals.
Voltage test
(Power frequency
withstand voltage)
Between electric circuit and case (ground).
AC2210V (50/60Hz) 5 seconds or
AC2000V (50/60Hz) 1 minute
Between auxiliary supply terminals and input, output
terminals.
Between input terminals and output terminals.
Impulse voltage
test
Between electric circuit and case (ground).
(Output circuits are grounded)
5kV 1.2/50μs
(Both positive and negative
polarity, for 3 times each)
Between auxiliary supply terminals and input terminals.
(Other circuits are grounded)
Between input terminals and auxiliary supply terminals.
(Other circuits are grounded)
Between input terminals. (Other circuits are grounded)
Between auxiliary supply terminals.
(Other circuits are grounded)
Continuation
over-input
Input 1.2 times continuation of rated voltage.
Aux. supply
1.2 times continuation of rated voltage (AC power supply, DC200/220V, DC24V)
1.3 times continuation of rated voltage (DC100/110V)
DC57V continuous (DC48V)
Short time
over-input
Input 2 times 10 seconds of rated voltage. once
2 times 1 second of rated voltage. 10 times, 10 second intervals
Aux. supply 1.5 times 10 seconds of rated voltage. once
Vibration
JIS C 60068-2-6 Sweep frequency range：10 to 55 to 10Hz,
Displacement amplitude (one-sided amplitude)：0.15mm,
Number of sweep cycles：10 times
Shock JIS C 60068-2-27 Peak acceleration：500m/s2 (when screw is installed),
300m/s2 (when IEC/DIN rail is installed)
7.4 Noise immunity
Item Specification
Damped oscillatory
wave immunity test
JEA B-402
Error within ±10% when peak voltage 2.5kV, frequency 1MHz ±10%, applied 3 times for
30 seconds.
・Auxiliary supply circuit (Normal / Common)
・Voltage input circuit (Normal / Common)
Square impulse
immunity test
JEA B-402
Error within ±10% when noise (1μs, 100ns width) is repeatedly applied for 5 minutes.
・Auxiliary supply circuit (Normal / Common) Over 1.5kV
・Voltage input circuit (Normal / Common) Over 1.5kV
・Output circuit (Induction) Over 1.0kV
Radio wave
immunity test
Error within ±10% when radio waves (5W) in the 150MHz and 400MHz bands are
intermittently irradiated at 1m, and radio waves from mobile phones and wireless
LAN (2.4GHz, 5GHz) at 0.5m.
Electrostatic
discharge immunity
JEA B-402
Conducted under normal usage conditions.
Air discharge：15kV, Contact discharge：8kV, Error within ±10%.

Q-222-034
9
7.5 EMC
Item Specification
Electrostatic
discharge immunity
test
Contact discharge
±4kV (Charge voltage)
Air discharge
±8kV (Charge voltage)
Performance
standard：B
After test：Within
inherent error
EN61000-6-2
EN61000-4-2
Radiated,
radio-frequency,
electromagnetic
field immunity test
Frequency：① 80 to 1000MHz
Performance
standard：A
During testing：
Within ±20% error
After test：Within
inherent error
EN61000-6-2
EN61000-4-3
② 1.4 to 2.0GHz
③ 2.0 to 2.7GHz
Field strength：① 10V/m
② 3V/m
③ 1V/m
Amplitude modulation：80%AM (1kHz)
Electrical fast
transient / burst
immunity test
Power port
(DC) ±2.0kV
Performance
standard：B
After test：Within
inherent error
EN61000-6-2
EN61000-4-4
Power port
(AC) ±2.0kV
Signal port ±1.0kV
Surge immunity test
Power port
(DC)
Line to ground ±0.5kV
Line to line ±0.5kV Performance
standard：B
After test：Within
inherent error
EN61000-6-2
EN61000-4-5
Power port
(AC)
Line to ground ±2.0kV
Line to line ±1.0kV
Signal port Line to ground ±1.0kV
Immunity to conducted
disturbances, induced
by radio frequency
fields
Frequency：0.15 to 80MHz
Voltage level：10V, 80%AM (1kHz)
Performance
standard：A
During testing：
Within ±20% error
After test：Within
inherent error
EN61000-6-2
EN61000-4-6
Power frequency
magnetic field
immunity test
Frequency：50/60Hz
Field strength：30A/m
Performance
standard：A
During testing：
Within ±20% error
After test：Within
inherent error
EN61000-6-2
EN61000-4-8
Voltage dips, short
interruptions and
voltage variations
immunity tests (AC
power supply port)
Residual voltage：0%, 1 cycle Performance
standard：B
After test：Within
inherent error EN61000-6-2
EN61000-4-11
Residual voltage：40%, 10/12 cycle Performance
standard：C
After test：Within
inherent error
Residual voltage：70%, 25/30 cycle
Residual voltage：0%, 250/300 cycle
Electromagnetic
radiation disturbance
Frequency band 30 to 230MHz, 10m distance：40dB (μV/m) or less
Frequency band 230 to 1000MHz, 10m distance：47dB (μV/m) or less
EN61000-6-4
EN55011
classA, Group1
Terminal interference
voltage
Power port (AC)：
Frequency band 0.15 to 0.5MHz, Quasi-peak：79dB or less,
Average ：66dB or less
Frequency band 0.5 to 30MHz, Quasi-peak：73dB or less,
Average ：60dB or less
Performance standard A：During and after the test the equipment shall be able to continue operation as
specified.
Performance standard B：The equipment shall be able to continue operation as specified after the test.
However, performance degradation during testing is allowed.
Performance standard C：Temporary loss of function is allowed, but the function can be self-healing or
can be recovered by operation of the control device.

Q-222-034
10
7.6 Structure and environmental conditions
Item Specification
Material BOX：ABS(V-0), Terminal board：ABS(V-0), Terminal cover：Polycarbonate
Color Munsell N1.5 (Black)
External dimensions 40×120×130mm (W×H×D)
Mass Approx. 250g
Protection rating IP30
Operating temperature and
humidity limits -10 to 55℃ , 5 to 90% RH (Non condensing)
Storage temperature limits -40 to 70℃
Product warranty period One year period
7.7 Technical standards
Item Specification
Transducer JIS C 1111：2019
IEC 60688 ：2012
CE marking
EMC Directive 2014/30/EU
EN 61000-6-2, EN 61000-4-2, -3, -4, -5, -6, -8, -11
EN 61000-6-4, EN 55011 classA, Group1
Low Voltage Directive 2014/35/EU
EN 61010-1
RoHS Directive 2011/65/EU+(EU)2015/863
EN IEC 63000
Safety IEC 61010-1
Measurement Category Ⅲ, Maximum use voltage：300V, Pollution degree 2
8. Input and output relationship
[V][mA]
2.5 0.5
OUTPUT
5 1
0 0 0 75 150[V]
0
150 300[V]
INPUT
[V][mA]
3 12
OUTPUT
5 20
1 4
0 75 150[V]
0
150 300[V]
INPUT

Q-222-034
11
9. Calibration
Because this product is adjusted, there is not need of calibration especially.
However, if discrepancy arises in an output in long-term use, please adjust in the next way.
Remove the terminal cover and VR cap before adjustment, and attach the VR cap and terminal cover after adjustment.
(1) For the output load, connect an actual load (within the output load range indicated on the name plate)
or a simulated load with the same resistance value as the actual load.
(2) Apply the auxiliary power supply (rated) and the input equivalent to 50% of the rated output value,
and energize for 15 minutes.
(3) Enter the lower limit of the rated output range and adjust with BIAS adjustment VR so that the output
becomes the lower limit.
Next, enter the upper limit of the rated output range and adjust the MAX adjustment VR so that the
output reaches the upper limit.
(The screwdriver for adjustment：Tip width of 1.8 to 2.3mm, Phillips-head screwdriver or flat-blade
screwdriver)
10. Type composition
AC Voltage Transducer
Type Specification code
VETT2-91A- ①②③④
① Model ② Input ③ Output (Output load range) ④ Auxiliary supply
B Model B 1 AC0 to 150V 2 DC0 to 1V (200Ω or more) AC80 to 264V
2 AC0 to 300V 3 DC0 to 5V (600Ω or more) F DC80 to 264V
Z Other 4 DC0 to 10V (2kΩ or more) AC/DC power supply
5 DC1 to 5V (600Ω or more) 3 DC20 to 57V
A DC0 to 1mA (10kΩ or less) Z Other
B DC0 to 5mA (2kΩ or less)
C DC0 to 10mA (1kΩ or less)
F DC4 to 20mA (550Ω or less)
Z Other
Tokyo Office : 11-13, Hitotsuya 1-chome, Adachi-ku, Tokyo, 121-8639, JAPAN.
TEL：[phone] , FAX：[phone]
Kyoto Office : 1-19, Ichinobe-Nishikawahara, Jyoyou-shi, Kyoto, 610-0114, JAPAN.
TEL：[phone] , FAX：[phone]
Revision A, DATE：October 31, 2022