Macro Sensors LVC-2500 User manual

User Manual
LVC - 2500
Low Voltage Conditioner
Manual Part No. 0653 0003 0000 Rev B

Index
Index
Manual Part No. 0653 0003 0000 Rev B
1.0 Safety Information 2 4.0 MATH Functions 18
1.1 Electrostatic discharge 3 4.1 MATH Introduction 18
4.2 MATH Set-up Procedure 19
2.0 Installation 4
2.1 Mounting and Access 4 5.0 Transducer Sensitivity 20
2.2 Connections and Link Identification 5 5.1 X2, X5 and DIV2 Link 20
2.3 Description of Links 6
2.4 Primary Frequency 7 6.0 Application 21
2.5 Transducer Input Load 7 6.1 Application Example 21
2.6 Bandwidth 7
2.7 Basic Configuration 8 7.0 Specification 22
2.8 Output Descriptions 9 7.1 Mechanical Outline 22
2.9 Connections 10 7.2 Technical Specification 23
2.10 Placement and EMC 11
2.11 LVC Synchronization 14
3.0 Setting Up 15
3.1 Set-up Summary 15
3.2 Set-up Procedure 16
1

1.0 Safety Information
1.0 Safety Information
2Manual Part No. 0653 0003 0000 Rev B
WARNING statements identify conditions or
practices that could result in personal injury or loss of
life.
CAUTION statements identify conditions or practices
that could result in damage to the equipment or other
property.
Terms in this Manual
This symbol indicates where applicable
cautionary or other information is to be
found.
Symbols in this manual
WARNING: Do not operate in an explosive atmosphere
WARNING: Safety critical environments
This equipment is not intended for use in a safety critical
environment
CAUTION: Low voltage
This equipment operates at below the SELV and is
therefore outside the scope of the Low Voltage Directive.
This equipment is designed to work from a low voltage
DC supply. Do not operate this equipment outside of
specification.
Warnings & Cautions

1.0 Safety Information (cont.)
1.0 Safety Information (cont.)
3Manual Part No. 0653 0003 0000 Rev B
1.1 CAUTION: Electrostatic Discharge
This equipment is susceptible to electrostatic discharge
(ESD) when being installed or adjusted, or whenever the
case cover is removed. To prevent ESD related damage,
handle the conditioning electronics by its case and do not
touch the connector pins.
During installation, please observe the following
guidelines:
Warnings & Cautions
• Ensure all power supplies are turned off
• If possible, wear an ESD strap connected to
ground. If this is not possible, discharge yourself by
touching a metal part of the equipment into which
the conditioning electronics is being installed
• Connect the transducer and power supplies with the
power switched off
• Ensure any tools used are discharged by contacting
them against a metal part of the equipment into
which the conditioning electronics is being installed
• During setting up of the conditioning electronics,
make link configuration changes with the power
supply turned off. Avoid touching any other
components
• Make the final SPAN and ZERO potentiometer
adjustments with power applied, using an
appropriate potentiometer adjustment tool or a
small insulated screwdriver

2.0 Installation Manual Part No. 0653 0003 0000 Rev B
2.0 Installation
4
Before mounting the LVC, please refer to section 2.10.
Hook the LVC on the DIN rail with the release clip facing down and push onto the rail until a ‘click’ is heard.
To remove, use a screwdriver to lever the release clip down. Pull the bottom of the housing away from the rail and unhook.
To access internal links, the front cover and PCB must be withdrawn from the housing. 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.
2.1 Mounting and Access
DIN Rail Withdraw PCB
12 43
Cover Release Latch

2.0 Installation (cont.)
2.0 Installation (cont.)
5Manual Part No. 0653 0003 0000 Rev B
2.2 Connections and link identification
Terminals 5, 11, and 15 are internally connected but, for best performance, they should be treated as
separate terminals.
• Coarse Offset
• Coarse Gain
• Bandwidth
• Null at set-up
• Math
• Input Load
• Input Gain
• Primary Frequency
• Synchronization
Transducer
1 Synchronization 1
2 Synchronization 2
3 Primary
4 Primary
5 Shield (0 V)
6CT
7 Secondary
8 Secondary
Power Supply & Outputs
9 Voltage Output
10 Math OUT
11 Gnd 0 V
12 Current OUT
13 Math External IN
14 Inverted Math OUT
15 –VE power supply
(Gnd)
16 +VE power supply
POWER
SPAN
ZERO

2.0 Installation (cont.)
2.0 Installation (cont.)
6Manual Part No. 0653 0003 0000 Rev B
The table below and subsequent diagrams explain the link functions and detail the factory settings.
2.3 Description of links
Link Description Options Factory Setting
COARSE GAIN Select coarse output gain Range 1 to 6 Link ON, position 1
COARSE OFFSET Select coarse output offset +VE, -VE, 5 V, 10 V No offset, links PARKED
NULL Used during set-up to null output Output in null state or enabled Link PARKED, output enabled
PRIMARY Select primary frequency 3 kHz, 5 kHz, 10 kHz Both links ON, 3 kHz
MT Select synchronization mode Master or track Set as master
INPUT LOAD Select transducer secondary load 100 kΩor 2 kΩLink PARKED, 100 kΩ
INPUT GAIN Input gain X1, X2, X5, DIV2 Link ON, X1
BW Sets output signal bandwidth L = 250 Hz, H = 500Hz Link ON, 250 Hz
MATH Enables math option A+B, A-B, (A+B)/2, (A-B)/2 Links PARKED, maths not set
Note: If the output polarity is incorrect, reverse the transducer secondary connections.
Link ON Link PARKED Link OFF

The LVC primary frequency is set using links as shown below. Transducer specifications determine the optimum frequency.
2.0 Installation (cont.)
2.0 Installation (cont.)
7Manual Part No. 0653 0003 0000 Rev B
2.4 Primary Frequency
Primary amplitude is not adjustable. The LVC
uses ratiometric techniques and is insensitive
to primary amplitude. Maximum secondary
transducer amplitudes must be observed.
Refer to section 5.1.
The LVC has two input load ranges. 100 kΩis often used for
LVDT transducers while 2 kΩis often used for Half Bridge
transducers. If loads of less than 100 kΩare required, an
external resistor may be wired across the SEC1 and SEC2
terminals. Most transducers perform well into 100 kΩ. See
specification section 7.2 for further details.
100 kΩ- link PARKED
2 kΩ- link ON
2.5 Transducer Input Load
The LVC has selectable bandwidth (BW). The bandwidth
setting is independent of other LVC settings. Where
possible, the lowest bandwidth setting should be used to
minimize output noise.
250 Hz - Link ON
500 Hz - Link PARKED
Note: Total system bandwidth is dependent on sensor
type and application
2.6 Bandwidth
3 kHz 5 kHz 10 kHz
1
2
3
4
1
2
3
4
1
2
3
4

2.0 Installation (cont.)
2.0 Installation (cont.)
8Manual Part No. 0653 0003 0000 Rev B
2.7 Basic Configuration
Please refer to section 2.10 before installation.
A floating output power supply is recommended
as it will minimize ground loop noise problems.
Please refer to section 6.1
for a typical arrangement.
Voltage and current
connections are shown.
Generally only one type
is used.

+
-
2.0 Installation (cont.)
2.0 Installation (cont.)
9Manual Part No. 0653 0003 0000 Rev B
2.8 Output Descriptions
This section describes how the various
outputs of the LVC are related.
Vout This is a voltage output. The gain and offset controls are used to set the required
output range. All other outputs are affected by changes made to Vout.
Iout This is a current output only, LVC is not loop powered. This can be set for up to ±20
mA. A common output is 4-20 mA. The Iout is proportional to Vout but cannot be
independently adjusted. The approximate relationship is shown below:
Voltage (V) -10 -8 -6 -4 -2 0 2 4 6 8 10
Current (mA) -20 -16 -12 -8 -4 0 4 8 12 16 20
When relating current to voltage, 4-20 mA is the same as a 2 to 10 V span (or ±4 V
with a +6 V offset).
Mout Mout is the main MATH output. This is a voltage output. Vout and Min are combined
in the MATH section. The output of this section is inverted to keep the signal
polarity the same as Vout.
Mout# This is an auxiliary voltage output. This is the direct output of the MATH stage
and is the inverse of Vout. If MATH options are not selected then Mout ∝Mout# ∝
Vout. Refer to section 4.1.
All outputs may be used at the same time but cannot be independently adjusted for span or zero.
Input Gain Coarse Gain SPAN
Transducer
Circuits
Offsets
Vout
Iout
Mout#
Mout
-1
-1
I ∝V
Min
MATH
and ZERO