M-system MLV User manual

BEFORE USE ....
Thank you for choosing M-System. 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 M-System’s Sales Office or representatives.
■PACKAGE INCLUDES:
Signal conditioner (body + base socket).............................(1)
■MODEL NO.
Confirm Model No. marking on the product to be exactly
what you ordered.
■INSTRUCTION MANUAL
This manual describes necessary points of caution when
you use this product, including installation, connection and
basic maintenance procedures.
POINTS OF CAUTION
■POWER INPUT RATING & OPERATIONAL RANGE
• Locate the power input rating marked on the product and
confirm its operational range as indicated below:
AC power: Rating ±10%, 50/60 ±2 Hz, approx. 2VA
DC power: Rating ±10%, approx. 2W
or 85 – 150V, approx. 2W for 110V rating
■GENERAL PRECAUTIONS
• Before you remove the unit from its base socket or mount
it, turn off the power supply and input signal for safety.
■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 continuous
vibration. Do not subject the unit to physical impact.
• Environmental temperature must be within -5 to +55°C
(23 to 131°F) with relative humidity within 30 to 90% RH
in order to ensure adequate life span and operation.
■WIRING
• Do not install cables close to noise sources (relay drive
cable, high frequency line, etc.).
• Do not bind these cables together with those in which
noises are present. Do not install them in the same duct.
■LVDT
• When cable from the mid-range is provided, leave it open.
• The input signal may be affected by the type and length of
the cable between the LVDT and the transmitter. When
calibrating the system before installation, use the same
type and length of cable.
• If there is an error greater than the described accuracy,
or when you need to change the frequency, please consult
with M-System.
• Certain type of LVDT may not be usable with the MLV.
Consult M-System before ordering to confirm the compat-
ibility.
■AND ....
• The unit is designed to function as soon as power is sup-
plied, however, a warm up for 10 minutes is required for
satisfying complete performance described in the data
sheet.
COMPONENT IDENTIFICATION
Connection Diagram
Front Cover
LCD Meter
(optional)
Body Base Socket
Specifications
■HOW TO OPEN THE FRONT COVER:
Hang your finger on the hook at the top of the front cover
and pull.
The shape of base socket may be different
for some models.
INSTALLATION
Detach the yellow clamps located at the top and bottom of
the unit for separate the body from the base socket.
Clamp
(top & bottom)
DIN Rail
35mm wide
Spring Loaded
DIN Rail Adaptor
Shape and size of the base socket
are slightly different with various
socket types.
■DIN RAIL MOUNTING
Set the base socket so that its
DIN rail adaptor is at the bot-
tom. Hang the upper hook at
the rear side of base socket on
the DIN rail and push in the
lower. When removing the
socket, push down the DIN
rail adaptor utilizing a minus
screwdriver and pull.
■WALL MOUNTING
Refer to “EXTERNAL DI-
MENSIONS.”
LVDT TRANSMITTER MODEL MLV
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]
EM-1356 Rev.8 P. 1 / 3
INSTRUCTION MANUAL

TERMINAL CONNECTIONS
Connect the unit as in the diagram below or refer to the connection diagram on the top of the unit.
■EXTERNAL DIMENSIONS unit: mm (inch)
5678
21 1110
80 (3.15)
50 (1.97) 107 (4.21)
136 (5.35) [3.3 (.13)]
80 (3.15)
20
(.79)
40 (1.57)
50 (1.97)
7.8 (.31)
CLAMP
(top & bottom)
DIN RAIL
35mm wide
2 – 4.5 (.18) dia.
MTG HOLE
25 (.98) deep
11
– M3.5
SCREW
• When mounting, no extra space is needed between units.
39
4
■CONNECTION DIAGRAM
7
8
10
2
1+
–
OUTPUT
U(+)
V(–)
POWER
6
3
11
9
LVDT
M LV
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]
EM-1356 Rev.8 P. 2 / 3

CHECKING
1) Terminal wiring: Check that all cables are correctly con-
nected according to the connection diagram.
2) Power input voltage: Check voltage across the terminal
7 – 8 with a multimeter.
3) Excitation input: Check the excitation amplitude across
the terminal 3 – 9 with an oscilloscope. It is normal if the
amplitude is 6 – 10 Vp-p (4 kHz).
4) Secondary voltage from LVDT: Check the voltage across
the terminal 10 – 11 with an oscilloscope.
5) Output: Check that the load resistance meets the de-
scribed specifications.
ADJUSTMENT PROCEDURE
This unit is calibrated at the factory to meet the ordered
specifications, therefore you usually do not need any cali-
bration.
For matching the signal to a receiving instrument or in case
of regular calibration, adjust the output as explained in the
following.
■FRONT PANEL CONFIGURATIONS
Front Cover (open)
Excitation Adj.
Gain Adj.
Span Adj.
Zero Adj.
LCD Meter
■HOW TO CALIBRATE THE OUTPUT SIGNAL
Use a signal source and measuring instruments of sufficient
accuracy level. Turn the power supply on and warm up for
more than 10 minutes.
1) Displace the core of the LVDT to the middle of its work-
ing range and confirm that output becomes 50 ±5%.
2) Displace the core of the LVDT to the 0% position of its
working range and adjust Gain so as to adjust output to
0%. If output moves toward 100% instead, the polarity
of the LVDT is reversed. Interchange connection of the
terminals 10 and 11 and readjust Gain in such a case.
3) Displace the core of the LVDT to the 100% position of its
working range and confirm that output becomes 100%. If
output deviates from 100%, adjust Span so as to adjust
output to 100%.
4) The excitation amplitude is factory-set to 8 Vp-p but can
be changed as needed. If changed, be sure to perform
steps 2) and 3) again as outputs at the 0% and 100% posi-
tions also change accordingly.
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 accu-
racy described in the data sheet. When the output is out of
tolerance, recalibrate the unit according to the “ADJUST-
MENT PROCEDURE” explained earlier.
LIGHTNING SURGE PROTECTION
M-System offers a series of lightning surge protector for
protection against induced lightning surges. Please contact
M-System to choose appropriate models.
M LV
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]
EM-1356 Rev.8 P. 3 / 3