TE Connectivity EAZY-CAL LVC-4500 User manual

TE CONNECTIVITY SENSORS /// LVC-4500 USER MANUAL 07/2019
Page 1
EAZY-CAL™ LVC-4500
LVDT Diff/Sum Mode Signal Conditioner
User Manual
Manual P/N 0653 0008 0000
Rev. --
April 18, 2016

EAZY-CAL™ LVC-4500
LVDT Diff/Sum Mode Signal Conditioner
TE CONNECTIVITY SENSORS /// LVC-4500 USER MANUAL 07/2019
Page 2
Contents
1 GENERAL DESCRIPTION ERROR! BOOKMARK NOT DEFINED.
2 ELECTRICAL CONNECTIONS ERROR! BOOKMARK NOT DEFINED.
3 DIP SWITCHES ERROR! BOOKMARK NOT DEFINED.
4 FRONT PANEL ERROR! BOOKMARK NOT DEFINED.
5 CALIBRATION PROCEDURE ERROR! BOOKMARK NOT DEFINED.
5.1 Notes on Laboratory Test Calibration Error! Bookmark not defined.
6 RS-485 DIGITAL INTERFACE 9
6.1 Command Format 9
6.2 Commands 9
6.3 Command Table 10
7 SYNCHRONIZATION ERROR! BOOKMARK NOT DEFINED.
8 ERROR DETECTION AND INDICATION ERROR! BOOKMARK NOT DEFINED.
9 LVC-4500 GENERAL SPECIFICICATIONS ERROR! BOOKMARK NOT DEFINED.

EAZY-CAL™ LVC-4500
LVDT Diff/Sum Mode Signal Conditioner
TE CONNECTIVITY SENSORS /// LVC-4500 USER MANUAL 07/2019
Page 3
1 General Description
The LVC-4500 Signal Conditioner performs Ratiometric Mode (Difference over Sum) signal conditioning. This mode provides superior thermal
drift immunity. Diff/Sum Mode requires a 5 wire LVDT connection. For best Diff/Sum Mode linearity, an LVDT with a constant voltage sum of
Secondary 1 and Secondary 2 is required. Differential mode requires only 4 wires. Selection between Diff/Sum Mode and Differential Mode is
made via DIP switch.
The EAZY-CAL™ LVC-4500 is a standalone signal conditioner, supporting a wide range of LVDTs, RVDTs and Half-Bridges and providing
several choices of voltage, current, and digital RS-485 outputs. Push button calibration offers intuitive operation as compared to units with
span and offset trim pots. Fault conditions such as a wire break on LVDT connections are indicated by blinking LEDs, output of an error
voltage or current, and Error Flag Open Collector signal. The LVC-4500 operates from a 9 – 30VDC power supply and is housed in a DIN rail-
mounted enclosure. Options such as Output Range, Excitation Frequency, Filter Cutoff, etc. are user selectable via DIP switches. Calibration
instructions, terminal functions, LVDT connection diagram and DIP switch functions are printed on the side panels for convenience.
Synchronization to other signal conditioners is accomplished by a daisy chain connection to a synchronization bus. One unit will assume the
Master function based on DIP switch priority setting. If a fault should occur, the next highest priority unit will take over as Master. With the use
of the RS-485 port, a host computer is able to retrieve measurement data, receive operational status, perform remote calibration and perform
hot swap reconfiguration.
Hot swapping installed LVC-4500 units is simplified by the pluggable terminal block feature. An LVC-4500 can be quickly replaced in a live
system without the need to unscrew terminal connections or sever connections between other signal conditioners. The illustration below
shows how the terminal plugs can be easily pried from their sockets using a small flat-head screwdriver. Once the newly replaced LVC-4500 is
in position the terminal plugs are then pushed back into their matching color coded positions by hand.
The following sections describe the features and operation of the LVC-4500.

EAZY-CAL™ LVC-4500
LVDT Diff/Sum Mode Signal Conditioner
TE CONNECTIVITY SENSORS /// LVC-4500 USER MANUAL 07/2019
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2 Electrical Connections
There are four color coded terminal plugs, each having 4 screw terminals. The 16 terminals are labeled 1 through 16. Terminal plugs can
be easily plugged and unplugged to facilitate LVC-4500 replacement in system. The terminal names and their function shown below:
Colo
Teial
Nae
Futio
White

SYNC I/O
Shoizatio Maste/Slae Iput/Output

E‘‘O‘ FLAG
Eo Flag Output

P‘IIMA‘Y
Pia Eitatio to LVDT

P‘IMA‘Y
Pia Eitatio to LVDT
Red

SHIELD GND
Optioal ale Shield oetio

CENTE‘ TAP
Seoda Cete Tap fo LVDT

SEC 
Seoda sigal fo LVDT

SEC 
Seoda sigal fo LVDT
Blue

VDC OUT+
Output Voltage

..
No Coetio

GND
VOUT / IOUT ‘etu

IDC OUT+
Output Cuet
Blak

‘S- B
‘S- Data +

‘S- A
‘S- Data -

VDC- GND
Suppl Voltage ‘etu

VDC+
Suppl Voltage Iput
Notes: Select either current or voltage output using DIP SW1.
Secondary Center Tap connection is required only in Diff/Sum Mode.
LVDT/LVRT Coetio Diaga
Half-Bidge Coetio Diaga

EAZY-CAL™ LVC-4500
LVDT Diff/Sum Mode Signal Conditioner
TE CONNECTIVITY SENSORS /// LVC-4500 USER MANUAL 07/2019
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3 Dip Switches
There are two 8-section DIP switches on the PCB. The switches provide selection of Primary Level, Excitation Frequency, Bandwidth, Output
Voltage Range Select, Output Invert, Diff/Sum Mode Enable and RS-485 Bus Address.
To access the DIP switches, the back cover is removed from the enclosure. Use a screwdriver or similar tool to depress the top latch. The
cover will spring forward. Repeat with the bottom latch, then gently pull the PCB out, as shown:

EAZY-CAL™ LVC-4500
LVDT Diff/Sum Mode Signal Conditioner
TE CONNECTIVITY SENSORS /// LVC-4500 USER MANUAL 07/2019
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The following table shows the control settings of the DIP switches:
FUNCTION
SWITCH -
SECTION
SETTING
Pia Die
Lo
High
Selet etee Vs High &
SW-
OFF
ON *
.Vs Lo Eitatio Output
Reseed
Disale Eo Detet
SW-
OFF *
ON
Output Iet
Noal
Iet
‘eese the dietio of
SW-
OFF *
ON
Output s. displaeet
Output Rage
- ADC
-VDC
.-.VDC
±VDC
Selet oe of fou VDC
outputs o the IDC output.
SW-
OFF
ON *
OFF
ON
SW-
OFF
OFF *
ON
ON
Diff/Su Ea
Diffeetial
Diff/Su
Selet etee Diff/Su &
Diffeetial Mode
SW-
OFF
ON *
Filte
Hz
Hz
Hz
oe
Selet oe of  filte utoffs
SW-
OFF
ON
OFF
ON *
SW-
OFF
OFF
ON
ON *
Feue
.KHz
KHz
.Khz
KHz
Selet oe of fou
SW-
OFF *
ON
OFF
ON
Eitatio Feueies
SW-
OFF *
OFF
ON
ON
Bus Addess
 
 
Addess Bits:
Selet oe of  ‘S- Bus Addess.
See tale fo sith oiatios.
Also selets pioit of Shoizatio
Maste/Slae ode.
SW-
OFF *
ON
ADD‘ - LSB
SW-
OFF *
ON
ADD‘
SW-
OFF *
ON
ADD‘
SW-
OFF *
ON
ADD‘
SW-
OFF *
ON
ADD‘
SW-
OFF *
ON
ADD‘ - MSB
* - Factory default settings.
Bus Address Selection
The Bus Address is defined by setting a binary number with the 6 switches. Each switch represents a binary-weighted value, as follows:
ADDR0 – ‘1’, ADDR1 – ‘2’, ADDR2 – ‘4’, ADDR3 – ‘8’, ADDR4 – ‘16’, ADDR5 – ’32’.
The address if formed by adding the numbers represented by the switches that have been set ON. (Example: ADDR0 & ADDR2 ON and all
others OFF results in a Bus Address of ‘5’.)
Bus Addr: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63
SW2-3
(ADDR0)
SW2-4
(ADDR1)
SW2-5
(ADDR2)
SW2-6
(ADDR3)
SW2-7
(ADDR4)
SW2-8
(ADDR5)
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON

EAZY-CAL™ LVC-4500
LVDT Diff/Sum Mode Signal Conditioner
TE CONNECTIVITY SENSORS /// LVC-4500 USER MANUAL 07/2019
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4 Front Panel
The front-facing side of the enclosure contains the push buttons and LED indicators which are used for calibrating the LVC-4500 to the LVDT.
Fot Pael Desiptio
OPER / CAL LED
‘ed
O idiates Opeatig Mode, Blikig idiates Caliatio Mode.
POSITION LEDs:
Duig Caliatio:
+
Yello
+ Yello idiates oe is aoe ull positio
NULL
Gee
NULL Gee idiates oe is at ull positio
-
Yello
- Yello idiates oe is elo ull positio
Duig Noal Opeatio:
Eo Coditio:
+ Yello likig idiates Pia Wie Beak
- Yello likig idiates Seoda Wie Beak
Shoizatio State:
+ Yello idiates Slae ode
NULL Gee idiates Maste ode
FULL SCALE / ZERO Buttos:
Duig Noal Opeatio:
Pess oth uttos fo  seods to ete Caliatio Mode
Duig Caliatio:
Pess )E‘O utto to set oe iiu edpoit positio

EAZY-CAL™ LVC-4500
LVDT Diff/Sum Mode Signal Conditioner
TE CONNECTIVITY SENSORS /// LVC-4500 USER MANUAL 07/2019
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Pess FULL SCALE utto to set oe aiu edpoit positio
Pess oth uttos fo  seods to aot Caliatio Mode
5 Calibration Procedure
Calibrating the LVC-4500 consists of entering Calibration Mode, finding the NULL (center) position of the LVDT core, attaching the core to the
object to be measured, and then moving the core to set the ZERO and FULL SCALE positions that will correspond to the minimum and
maximum output voltage or current. The LVC-4500 returns to Operating Mode immediately after both positions have been set.
The basic calibration instructions are printed on the side of the LVC-4500 for reference.
Directions are as follows:
1. Set the LVC-4500 DIP Switches for the desired application. The factory default settings are typical for most standard LVDTs. Refer
to Section 3 for details.
2. Connect the LVDT to the LVC-4500 as shown in the connection diagram. The Secondary Center Tap connection is required in
Diff/Sum Mode, but optional in Differential Mode.
3. Apply power. The OPER/CAL LED will light, along with the Green NULL LED (if the unit is in Master Sync mode), or the Yellow +
LED (if the unit is in Slave mode). Three minutes of warm-up time is recommended.
4. Enter Calibration Mode by pressing and holding the FULL SCALE and ZERO Buttons on the LVC-4500 front panel, simultaneously
for 3 seconds minimum. The OPER/CAL LED will begin blinking.
5. Move the LVDT core to NULL (green LED) position by observing the 3 Position LEDs. The + and – LEDs indicate that the core is
inserted or extended beyond the NULL, respectively.
6. Attach the core to the workpiece to be measured so that the workpiece center of motion is aligned with the LVDT NULL.
7. Move workpiece to its minimum position and press the ZERO button. Wait for the Position LEDs to stop blinking.
8. Move workpiece to its maximum position and press the FULL SCALE button. The unit will exit Calibration Mode and operate with its
new calibration. The OPER/CAL LED will be steady On.
5.1 Notes Regarding Calibration
It is important that the NULL position be set as close as possible to the center of the displacement range. Otherwise, non-linearity errors
may result at or near the endpoint positions.
The LVDT core MUST NOT protrude from the LVDT during the calibration, or erroneous calibration will result.
Calibration may be performed by setting the FULL SCALE position first rather than ZERO position. Either end position may be on either
side of NULL.
Any portion of the LVDT specified displacement can be calibrated to produce a full output span with an LVDT having sufficient sensitivity.
If the desired displacement is asymmetrical, set the endpoint that is farthest from NULL first.
Swapping SEC-1 with SEC-2 or PRI-1 with PRI-2 LVDT connections will reverse the direction indicated by the Position LEDs.
Calibration mode can be canceled at any time by pressing the 2 buttons simultaneously for 3 seconds.
LVDTs without a constant secondary voltage sum may not yield as linear an output when operated in the Diff/Sum Mode.
6 RS-485 Digital Interface
Included on the LVC-4500 is a 2 wire multi-drop RS-485 communications port. This allows a user to perform a remote calibration through a
host computer. It also offers the user the capability of receiving operational status information and the retrieval of measurement data. Data
can be exchanged between one or more units and a PC with a USB-to-RS485 adapter attached. A terminal program (Hyperlink) or 3rd party
software is required. Port parameters are set to 9600 bps, no parity, 8 data bits and 1 stop bit (9600, NP, 8,1). Data is ASCII.

EAZY-CAL™ LVC-4500
LVDT Diff/Sum Mode Signal Conditioner
TE CONNECTIVITY SENSORS /// LVC-4500 USER MANUAL 07/2019
Page 9
6.1 Command Format
Units respond to commands in the format:
:aa cmd param (CR)
where:
‘:’ is the colon character,
‘aa’is the Unit Address 00..15, as set by the Digital Address DIP switches
‘cmd’ is the command
‘param’ is the optional command parameter
‘(CR) ‘is a carriage Return character
A space character is required between the address and command and between the command and parameter. Commands are not case
sensitive.
6.2 Command Format
The LVC-4500 command descriptions and their responses are shown in the following table.
Note that the ADC Slope, ADC Offset, INA (Instrumentation Amplifier) Gain, and ADC Range parameters are computed during calibration, and
can be downloaded into another unit. This allows for hot swap configuration, where a replacement unit can instantly function in place of the
old unit without the need for rerunning the calibration process.
RS-485 communications port commands such as ‘cal’ ‘setFull’ ‘setZero’ and ‘abortCal’ allow the user to enter and exit calibration mode using
a host PC. All actions for a calibration procedure should be performed either by way of manually pushing the front panel buttons or by way of
entering commands on a PC using the RS-485 communication link. It should not involve procedural steps that mix both approaches.

EAZY-CAL™ LVC-4500
LVDT Diff/Sum Mode Signal Conditioner
TE CONNECTIVITY SENSORS /// LVC-4500 USER MANUAL 07/2019
Page 10
6.3 Command Table
Coad, Desiptio
Sta
Respose
getCofig
Shos the opeatig state of the uit ad displas a list
:aa getCofig C‘
Mao Sesos LVC- Cofiguatio:
of all of the sigifiat paaetes as sho.
H/W Vesio ‘EV. --
F/W Vesio DiffSu LVC- .
Seial No.
Bus Addess 
Eitatio Fe. .KHz
Filte Selet NONE
Diff/Su Mode ENA
Output Iet NO‘M
Output ‘age VOUT U
ADC Slope .
ADC Offset -
INA Gai 
ADC ‘age 
S State MASTE‘
getOut
‘etus oial aalog output alue i uits of Output
‘age.
:aa getOut C‘
.VDC
sADCsl
Set the ADC Slope oeffiiet duig hot sap
eofiguatio.
:aa sADCsl . C‘
.OK
sADCos
Set the ADC Offset oeffiiet duig hot sap
eofiguatio.
:aa sADCos  C‘
OK
setINA
Set the Istuetatio Aplifie gai duig hot sap
eofiguatio.
:aa setINA  C‘
INA GAIN = 
setADCa
Set the ADC ‘age duig hot sap eofiguatio.
:aa setADCa  C‘
ADC ‘age = 
al
Ete Caliatio Mode
:aa al C‘
CAL MODE ENTE‘ED
getLEDs
Get state of LEDs duig aliatio.
:aa getLEDs C‘
UP / DOWN / NULL
setFull
Set the Full displaeet positio duig aliatio.
:aa setFull C‘
FULL SET [CAL DONE]
setZeo
Set the )eo displaeet positio duig aliatio.
:aa set)eo C‘
)E‘O SET [CAL DONE]
aotCal
Aot the aliatio poedue.
:aa aotCal C‘
CAL ABO‘T
getS
‘etus the shoizatio state.
:aa getS C‘
MASTE‘ / SLAVE / LISTEN