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Vishay Precision Group LVD 3, Инструкции по эксплуатации и монтажу

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Operating

 

and

 

Installation

 

instructions

  

14

 

If

 

feedback

 

of

 

the

 

secondary

 

voltages

 

will

 

be

 

used,

 

this

 

feedback

 

type

 

for

  

amplitude

 

control

 

of

 

the

 

oscillator

 

must

 

also

 

be

 

checked.

  

Change

 

to

 

secondary

 

feedback

 

(SW2

 

in

 

position

 

‘SEC.’).

  

Measure

 

the

 

AC

 

voltage

 

at:

  

 

test

 

sockets

 

Sec.

 

1

 

–

 

Com.

  

 

test

 

sockets

 

Sec.

 

2

 

–

 

Com.

  

for

 

a

 

few

 

different

 

transducer

 

core

 

positions.

  

Calculate

 

the

 

mean

 

value

 

of

 

each

 

pair

 

of

 

measured

 

voltages.

  

These

 

mean

 

values

 

shall

 

be

 

equal

 

to

 

the

 

voltage

 

at

 

test

 

sockets

 

Prim.

 

–

 

Com.,

 

measured

 

earlier

 

with

 

primary

 

feedback

 

setting

 

(3.3

 

–

 

3.5

 

V

 

AC).

  

The

 

actual

 

voltage

 

Prim.

 

–

 

Com.

 

must

 

be

 

less

 

than

 

6

 

VAC,

 

or

 

the

 

transformer

 

ratio

 

of

 

the

 

transducer

 

is

 

not

 

suitable

 

for

 

secondary

 

feedback.

  

Output

 

signals

  

Disconnect

 

the

 

output

 

load

 

and

 

check

 

that

 

output

 

signals

 

are

 

obtained

 

in

 

response

 

to

 

transducer

 

core

 

movements

 

over

 

the

 

entire

 

measuring

 

range

 

as

 

follows:

  

 

Bipolar

 

output:

 

±10

 

V

 

DC

 

at

 

test

 

sockets

 

V

 

out

 

–

 

Com.

  

 

Monopolar

 

output:

 

0

 

–

 

+10

 

V

 

DC

 

at

 

test

 

sockets

 

V

 

out

 

–

 

Com.

  

 

Current

 

output:

 

4

 

–

 

20

 

mA

 

from

 

terminal

 

10

 

to

 

terminal

 

9,

 

using

 

an

 

ammeter

  

or

  

2

 

–

 

10

 

V

 

DC

 

across

 

a

 

500

 

ohm

 

resistor,

 

connected

 

to

 

terminals

 

10

 

and

 

9.

  

 

Cables

 

with

 

load

  

Disconnect

 

the

 

output

 

cables

 

from

 

LVD

 

3

 

and

 

measure

 

the

 

load

 

resistance,

 

including

 

the

 

cables,

 

with

 

a

 

multimeter:

  

 

Load

 

for

 

the

 

current

 

output

 

must

 

not

 

exceed

 

500

 

ohms

  

 

Load

 

for

 

the

 

voltage

 

output

 

must

 

exceed

 

6

 

kohms.

  

 

 

 

Содержание LVD 3

Страница 1: ...Op Ins erati tallat ng a tion i and instru LVDT uctio T Sig ons nal co onditi LV oner D 3 GB ...

Страница 2: ......

Страница 3: ...NS General 5 Potentiometers 5 Test sockets 5 INSTALLATION General 7 Connections 7 Set up procedure 7 Calibration 8 FAULT FINDING General 11 Transducers 11 Transducer cables 11 Signal conditioner module 12 Cables with load 13 APPENDICES 1 Table of settings 2 Declaration of Conformity ...

Страница 4: ......

Страница 5: ...a at surface A plug in termi ccessible at t n er module d type LVDT t annel are an ally isolated asily installed All electrical c nal block for he front pan Figure 1 designed for thus forming alogue volta from each o d on a DIN ra connections r each chann nel 1 Signal con use togethe g two channe age and a cur ther and ail or attache to LVD 3 are nel Adjustme nditioner LV LVDT Sign er with els for...

Страница 6: ...e position signal is adjusted by a potentiometer in one of three ranges selected by switches Zero offset for the signal is also adjusted by a potentiometer The position signal is a current loop 4 to 20 mA and a monopolar voltage 0 to 10 V DC or a bipolar voltage 10 to 10 V DC LVD 3 4 20 mA 4 Demod Current Output Sec 1 Osc U Bal Gain high mid low 1 2 3 SW1 SW2 Sec 2 I Amplitude Control LVDT Signal ...

Страница 7: ...6 kohm Current output 4 20 mA Rload 500 ohm Linearity 0 05 Offset adjust range 2 7 of range Offset drift max 2 mV Gain ranges low 2 1 5 8 differential AC input mid 5 2 15 to bipolar DC output high 14 39 Gain drift max 0 1 Filter bandwidth 125 Hz 3 dB Power supply per channel Supply voltage 24 V DC 20 Fuse 200 mA slow Continuous current 120 mA Surge current 250 mA CE conformity EMC industrial proce...

Страница 8: ...de through a single plug in terminal block on one side of the LVD 3 module C om Prim Sec 1 Sec 2 Bal G ain V out LVD 3 Channel 1 V out G ain Sec 1 Sec 2 C om Bal Prim Channel 2 COM PRIM COM SEC 1 COM SEC 2 COM V OUT COM I OUT 24V 1 2 3 4 5 6 7 8 9 10 11 12 CHANNEL 1 ARTNR S N 110 171 COM PRIM COM SEC 1 COM SEC 2 COM V OUT COM I OUT 24V 1 2 3 4 5 6 7 8 9 10 11 12 CHANNEL 2 ...

Страница 9: ... is set for an output signal of 10 to 10 V Then with correct adjustment 0 V will correspond to the core centre position for the connected transducer Consequently 10 and 10 V will correspond to the limits of the measurement range for the connected transducer Potentiometers Gain Adjustment of gain for the channel Bal Adjustment of zero offset for the channel Adjustment of gain and zero offset is tho...

Страница 10: ...rating and Installation instructions 6 30 7 35 75 100 110 5 60 85 Mounting holes 2 x 4 mm dia The snap lock for the DIN rail can be opened with a fine screw driver Figure 4 Mechanical dimensions for LVD 3 ...

Страница 11: ... 2 terminals 3 4 and 5 6 Output signals Two output signals are available for each channel one current loop output 4 20 mA from terminal 10 to terminal 9 one voltage output 0 10 V or 10 10 V at terminal 8 with 0 V reference at terminal 7 The voltage output can also be measured at test socket V out reference Com Set up procedure General Figure 5 Each channel has a separate circuit board with test so...

Страница 12: ...sting the zero point Figure 5 For a position transducer type LVDT the core centre position is an accurate reference point It should correspond to the centre of the output signal range 0 V for bipolar and 5 V for monopolar voltage 12 mA for current loop Setting of this zero reference point should be performed in four steps STEP 1 Set the amplifier gain in medium range by the switches SW1 SW1 no 1 a...

Страница 13: ... increase the output signal turn counter clockwise to decrease it If a sufficiently high output signal cannot be obtained the high gain range must be selected by SW1 SW1 no 3 set to ON SW1 no 2 and no 1 set to OFF If a sufficiently low output signal cannot be obtained the low gain range must be selected by SW1 SW1 no 1 set to ON SW1 no 2 and no 3 set to OFF If the gain range has been changed by SW...

Страница 14: ...Operating and Installation instructions 10 ...

Страница 15: ... Oscillator Gain Bal 24 V Channel 1 Demodulator Amplifier Oscillator Power Supply Gain Bal Channel 2 LVD 3 Output signals Cable Cable 24 V Position Transducer type LVDT Position Transducer type LVDT Power Supply Output signals Figure 6 System for position measurement ...

Страница 16: ... is operating or not The signal paths of the system can be measured with the power on or off Transducers Use a multimeter set to resistance measurement to check that the transducer coil resistances correspond to the values in the transducer specification Generally the primary coil has the lowest resistance and the secondary coils mutually have the same resistance Check the transducer attachment an...

Страница 17: ...other cases there is a fault in the oscillator and the circuit board must be changed If the fault disappeared the transducer and transducer cable must be checked with respect of short circuits If the oscillator function is correct you can proceed and check the input signals from the transducer Input signals from transducer Input signals to LVD 3 from the transducer can be checked at the test socke...

Страница 18: ...rim Com must be less than 6 VAC or the transformer ratio of the transducer is not suitable for secondary feedback Output signals Disconnect the output load and check that output signals are obtained in response to transducer core movements over the entire measuring range as follows Bipolar output 10 V DC at test sockets V out Com Monopolar output 0 10 V DC at test sockets V out Com Current output ...

Страница 19: ...LVDT Signal Conditioner LVD 3 15 1 3 2 SW1 ON OFF SW3 10 0 10 SW2 SEC PRIM Com Prim Sec 1 Sec 2 Bal Gain V out Fuse Component side of LVD 3 circuit board Equal for Channel 1 and Channel 2 ...

Страница 20: ......

Страница 21: ...ary SEC Channel 2 Primary PRIM Secondary SEC Output selection SW3 Channel 1 Monopolar 0 10 Bipolar 10 Channel 2 Monopolar 0 10 Bipolar 10 Gain adjustment SW1 Channel 1 Gain 14 39 high SW1 No 1 ON No 2 OFF No 3 OFF Gain 5 2 15 mid SW1 No 1 OFF No 2 ON No 3 OFF Gain 2 1 5 8 low SW1 No 1 OFF No 2 OFF No 3 ON Channel 2 Gain 14 39 high SW1 No 1 ON No 2 OFF No 3 OFF Gain 5 2 15 mid SW1 No 1 OFF No 2 ON ...

Страница 22: ......

Страница 23: ...LVDT Sign A De nal Condition ppendix 2 eclaration o ner LVD 3 2 of Conformi ity ...

Страница 24: ......

Страница 25: ......

Страница 26: ... Box 423 SE 691 27 Karlskoga Sweden Phone 46 586 63000 Fax 46 586 63099 pw se vishaypg com www weighingsolutions com Document no 35181 Article no 600 382 R5 Vishay Nobel AB 2011 05 19 Subject to changes without notice ...

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