M-system LWT User manual

5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax:
[phone] E-mail: [e-mail]
EM-1975 Rev.4 P. 1 / 3
INSTRUCTION MANUAL
WATT TRANSDUCER
(with pulse output) MODEL LWT
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 ...............................................................(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
■AUXILIARY POWER INPUT RATING & OPERATIONAL
RANGE
•Locate the auxiliary power input rating marked on the
product and confirm its operational range as indicated
below:
AC power: Rating -15/+10%, 50/60 Hz, approx. 2 VA
DC power: Rating ±10%, approx. 2 W
or 85 – 150 V, approx. 2 W for 110 V rating
■GENERAL PRECAUTIONS
•Before you remove the unit 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 -10 to +55°C
(14 to 131°F) with relative humidity within 30 to 85% 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.
■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
Zero Adj.
Specifications
Connection Diagram
Body
Span Adj.
INSTALLATION
■DIN RAIL MOUNTING
Set the unit so that its DIN rail adaptor is at the bottom.
Position the upper hook at the rear side of the unit on the
DIN rail and push in the lower. When removing the unit,
push down the DIN rail adaptor utilizing a screwdriver (–)
and pull.
DIN Rail
35mm wide
Spring Loaded
DIN Rail Adaptor
■WALL MOUNTING unit: mm (inch)
2–M5
60 (2.36)
60 (2.36)
■M5 SCREWS
2–M4
60 (2.36)
50 (1.97)
■ M4 SCREWS

LW T
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax:
[phone] E-mail: [e-mail]
EM-1975 Rev.4 P. 2 / 3
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)
112 (4.41) [3.3 (.13)]
35.4 (1.39)
DIN RAIL
35mm wide
8 (.31) M3.5 SCREW
(Only on the used terminals)
75 (2.95)
TERMINAL
COVER
2–5.8 (.23) dia. or
2–4.8 (.18) dia.
MTG HOLE
8 (.31) deep
•When mounting, no extra space is needed between units.
75 (2.95)
910111213141516
12 345678
3 (.12)1(.04)
■CONNECTION DIAGRAM
0
+
–
14
16
15
7
8
1
5
6
2
PULSE OUTPUT
+
–
11
12
DC OUTPUT
■ 3-PHASE/3-WIRE ■ SINGLE-PHASE/2-WIRE
LOAD
12
SOURCE
P2V
P1U
v
u
FUSE VT
k
l
CT
L
K
1L
1S
+
–
14
15
7
8
1
2
PULSE OUTPUT
■ SINGLE-PHASE/3-WIRE
+
–
14
16
15
7
8
1
5
6
2
PULSE OUTPUT
9
10
U(+)
V(–)
*This unit can be powered from the input voltage when the voltage is
sufficiently stable and meets other supply voltage requirements.
LOAD
1N23
SOURCE
P2
V
P1U
v
u
FUSE VT
Vv
P3
Uu
Vv
P0
Uu
KKK
+
–
7
8
PULSE OUTPUT
9
10
U(+)
V(–)
14
15
16
13
1
2
3
4
5
6
■ 3-PHASE/4-WIRE
9
10
U(+)
V(–)
+
–
11
12
DC OUTPUT
+
–
11
12
DC OUTPUT
+
–
11
12
DC OUTPUT
9
10
U(+)
V(–)
■ Open Collector
Pulse Output Connection Example
AUXILIARY
POWER
*AUXILIARY
POWER
*
AUXILIARY
POWER
*
AUXILIARY
POWER
*
LOAD
1N2
SOURCE
P0V
P1U
v
u
FUSE VT
Vv
P2
Uu
k
CT
L
K
1L
1S
2L
2S
k
ll
L
K
+
-
7
8
CT
L
1L
1S
2L
2S
3L
3S
LL
kkk
lll
LOAD
123
SOURCE
P2V
P1U
v
u
FUSE VT
Vv
P3
Uu
k
l
CT
L
K
1L
1S
3L
3S
k
l
L
K

LW T
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax:
[phone] E-mail: [e-mail]
EM-1975 Rev.4 P. 3 / 3
■TERMINAL ASSIGNMENTS
1 2 3 4 5 6 7 8
9 10 11 12 13 14 15 16
WIRING INSTRUCTIONS
■SCREW TERMINAL
Torque: 0.8 N·m
CHECKING
1 ) Terminal wiring: Check that all cables are correctly
connected according to the connection diagram.
2 ) Auxiliary power input voltage: Check voltage across
terminal 9 – 10 with a multimeter.
3 ) Input: Calculate the calibration range and check that
the result is within the usable range.
Calibration Range [W] = Measuring Wattage
(VT Ratio) × (CT Ratio)
4 ) DC output: Check that the load resistance meets the
described specifications.
5 ) Pulse output: Check that the load connected to the open
collector output is within 35 V DC @ 100 mA.
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.
■HOW TO CALIBRATE THE OUTPUT SIGNAL
Use a signal source and measuring instruments of suffi-
cient accuracy level. Turn the auxiliary power supply on
and warm up for more than 10 minutes.
1 ) ZERO: Apply 0% input and adjust output to 0%.
2 ) SPAN: Apply 100% input and adjust output to 100%.
3 ) Check ZERO adjustment again with 0% input.
4 ) When ZERO value is changed, repeat the above proce-
dure 1) – 3).
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.