20VS2-2

INSTRUCTION MANUALISOLATION AMPLIFIERMODEL(output isolation)

BEFORE USE ....
Thank you for choosing us. Before use, please check contents of the package you received as outlined below.
If you have any problems or questions with the product,
please contact our sales office or representatives.
■ PACKAGE INCLUDES:
Amplifier........................................................................ (1)■ MODEL NO.
Confirm Model No. marking on the product to be exactly
what you ordered.

20VS2-2■ WIRING• Do not install cables (power supply, input and output)
close to noise sources (relay drive cable, high frequencyline, etc.).
• Do not bind these cables together with those in which
noises are present. Do not install them in the same duct.
• Mounting multiple isolator modules on single printed
wiring board could cause beat. In such case, use the way
shown as below to make the power supply oscillation frequency of each module to a same one for prevention.

20VS2-x

20VS2-x

20VS2-x
22kΩ■ INSTRUCTION MANUALThis manual describes necessary points of caution when
you use this product, including installation, connection andbasic maintenance procedures.

POINTS OF CAUTION■ CONFORMITY WITH EC DIRECTIVES
The compliance with EC Directive is confirmed on the input,
output and power supply pins with mounting on a printedwiring board without other devices. The actual installation
environments such as the connected wires and mounted
components on the printed wiring board may affect the protection level of this module. Confirm the CE requirements
in regard to the whole system and employ additional protective measures to ensure CE conformity. The reference
voltage source* shall be used in the printed wiring board onwhich the unit is mounted.
*The total length of the wiring shall not be more than 3 m.

22kΩ

171717181818■ INSTALLING THE MODULE
When it is installed on the printed wiring board, land diameter ø1.5 and through-hole ø0.9 are recommended.
■ AND ....
• The unit is designed to function as soon as power is supplied, however, a warm up for 10 minutes is required forsatisfying complete performance described in the datasheet.
• With voltage output, do not leave the output terminals
shortcircuited for a long time. The unit is designed to endure it without breakdown, however, it may shorten appropriate life duration.

■ POWER INPUT RATING & OPERATIONAL RANGE• Locate the power input rating marked on the product andconfirm its operational range as indicated below:
15V DC ±2%, approx.10mA without load
• Surge in the power supply can be cut off as the surge absorbers are installed in the power supply, input and output. When there is spike noises in the power, make a filter
with an appropriate capacitor and inductor to cut it off.
■ ENVIRONMENT• Indoor use• When heavy dust or metal particles are present in the air,install the unit inside proper housing with sufficient ventilation.
• Do not install the unit where it is subjected to continuousvibration. Do not subject the unit to physical impact.
• Environmental temperature must be within 0 to 60°C (32to 140°F) with relative humidity within 30 to 90% RH inorder to ensure adequate life span and operation.

MG CO., LTD. www.mgco.jp
5-2-55 Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPANEM-4409 Rev.5P. 1 / 3

20VS2-2

TERMINAL CONNECTIONS■ EXTERNAL DIMENSIONS mm (inch)
18 (.71)■ TERMINAL ASSIGNMENTS

49 (1.93)+ 20

1 +– 19

2 COM (–)+ 15

7 +15V– 16

9 COM (0V)

14 (.55)INPUTOUTPUT

5.5 (.22)

0.5 (.02)

POWER SUPPLY

0.3 (.01)

REFERENCE *VOLTAGESOURCE8 –15V

0.5 (.02)
20.32 (.80)

13.97 (.55) 7.62 (.30)

1.27 (.05)

1 2 3 4 5 6 7 8 915161718

36353433

22212019

14 (.55)*To be used in the printed wiring board on
which the unit is mounted.

2.54 (.10)■ PIN ASSIGNNO.

FUNCTION1Output (+)

2

Output (-)

3

Output Attenuation

4

Output Amplification

5NC

6

NC

7

Reference Voltage Source (+)

8

Reference Voltage Source (-)

9

Reference Voltage Source (COM)15Power Supply (+)

16Power Supply (-)

17

Synchronous Input

18

Synchronous Output

19

Input (-)

20

Input (+)

21

Input Amplification

22

Input Attenuation

33

NC

34

NC

35

NC

36

NC

CHECKING
1) Terminal wiring: Check that wiring is correctly connected according to the connection diagram.
2) Power input voltage: Check voltage across the pins.
3) Input: Check that the input signal is within 0 – 100% ofthe full-scale.
4) Output: Check that the load resistance meets the described specifications.

MG CO., LTD. www.mgco.jp
5-2-55 Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPANEM-4409 Rev.5

P. 2 / 3

20VS2-2

ADJUSTMENT PROCEDURE■ ADJUSTMENT AT INPUT
To adjust zero and span, use external adjusters.
In order to shift the zero at input, supply reference voltage
to pin 21. The following formula shows how much the zeroshifts. (input signal at pin 20 = VIN; output signal at pin 1 =VOUT; reference voltage = VREF; zero shift = VOUT SHIFT.)					
10 kΩVOUT SHIFT = (–––––––––) × VREF					R1In order to attenuate input signal, connect a resistor to pin
22. The following formula shows the attenuated output.
(R2 ≥ 1.1 kΩ)				
R2
VOUT = (–––––––––––) × VIN			
R2 + 10 kΩ+ 20+–

INPUT VIN–10kΩ■ ADJUSTMENT AT OUTPUT
To adjust zero and span, use external adjusters.
The incorporated resistor, 2.2 kΩ and an external resistor,
R5 (kΩ) connecting across the pin 2 and pin 4 amplifies output as following formula.			
2.2kΩ
VOUT = (–––––––– + 1) × VIN			
R5In order to attenuate input signal, connect a resistor to pin
3. The following formula shows the attenuated output. (R6≥ 1.1 kΩ)				
R6
VOUT = (–––––––––––) × VIN			
R6 + 10 kΩ

10kΩ+–+–+–

1 +OUTPUT VOUT
R62.2kΩR121VREF–219

310kΩ

R5R2422

External resistors and adjusters make zero and span adjustment available.

External resistors and adjusters make zero and span adjustment available.

+ 20

1 +192 –OUTPUT ±10VDC

INPUT VIN

–R33SPAN ADJ.

SPAN ADJ.

2221R4-VREF+VREF
ZERO ADJ.

4R8R77+15V

8-15V

9ZERO ADJ.
COM (0V)
LM329BZ

LM329BZ

MAINTENANCE
Regular calibration procedure is explained below:■ CALIBRATION
Warm up the unit for at least 10 minutes. Apply 0%, 25%,50%, 75% and 100% input signal. Check that the output
signal for the respective input signal remains within accuracy described in the data sheet.

MG CO., LTD. www.mgco.jp
5-2-55 Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPANEM-4409 Rev.5

P. 3 / 3