Download LWT/LWTN - M

INSTRUCTION MANUAL
model
WATT TRANSDUCER
Thank you for choosing M-System. Before use,check specifications
on the unit label.
If you have any problems or questions with the product, please contact
M-System's Sales Office or representatives.
General Description
The L-UNIT Model LWT/LWTN provides a DC output proportional to
AC active power.
• LWT: auxiliary power supply
• LWTN: self-powered
• Little ripple; stable output
• Input-output isolated
• Frequency output available for totalizing counter
• No auxiliary power source is required for model LWTN
Adjustments
This module is factory calibrated within ±0.5% of reference input level.
ZERO is adjustable to ±5%, SPAN to ±10%.
A) ZERO: With minimum (0%) input, adjust output to 0%.
B) SPAN: With full-scale (100%) input, adjust output to 100%.
C) Check ZERO adjustment again with the minimum input.
D) When ZERO value is changed, repeat the procedure A) to C).
Troubleshooting
When output is irregular, check the following points:
A) Terminal wiring
B) Power wiring and polarity (LWT)
C) Input: Calculate the transducer input using the following equation
and check that the result is within the available range described in
the data sheet.
Installation [Scale: mm(inch)]
• Operating temperature: -10 to +55°C (23 to 131°F)
• Operating humidity: 30 to 85% RH (non-condensing)
Keep away from water, corrosive gas, dust and vibration. Wall or DIN
rail mounting available.
■M5 SCREWS
■M4 SCREWS
Transducer Input [W] =
Measuring Range
(PT Ratio) × (CT Ratio)
D) Output: With current output, be sure that load resistance is within
the permissible limit including wiring resistance. With voltage
output, check that the minimum load is met.
E) Frequency Output: Check that the load is less than 35V DC/100mA.
60 (2.36)
2–M5
50 (1.97)
60 (2.36)
60 (2.36)
LWT/LWTN
2–M4
Terminal Connections
Make wiring to terminals as shown in the following page.
M-SYSTEM WARRANTY
M-System warrants such new M-System product which it manufactures to be free from defects in materials and workmanship during the 36-month period following the date that such product
was originally purchased if such product has been used under normal operating conditions and properly maintained, M-System's sole liability, and purchaser's exclusive remedies, under this
warranty are, at M-System's option, the repair, replacement or refund of the purchase price of any M-System product which is defective under the terms of this warranty. To submit a claim under
this warranty, the purchaser must return, at its expense, the defective M-System product to the below address together with a copy of its original sales invoice.
THIS IS THE ONLY WARRANTY APPLICABLE TO M-SYSTEM PRODUCT AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING ANY IMPLIED
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. M-SYSTEM SHALL HAVE NO LIABILITY FOR CONSEQUENTIAL, INCIDENTAL OR SPECIAL
DAMAGES OF ANY KIND WHATSOEVER.
M-System Co., Ltd., 5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN, Phone: (06) 6659-8201, Fax: (06) 6659-8510, E-mail: [email protected]
P. 1 / 2
EM-1975 Rev.3
LWT / LWTN
Terminal Connections
■3-PHASE/3-WIRE
■SINGLE-PHASE/2-WIRE
SOURCE
1 2
SOURCE
1 2 3
FUSE
U
PT
u
V
V
v
v
U
u
P1
P2
P3
K
FUSE
7 +
14
PULSE OUTPUT
15
8 –
16
11 +
12 –
k
1S
k
1L
CT
l
L
3S
l
L
3L
v
P2
7 +
15
8 –
PULSE OUTPUT
DC OUTPUT
K
2
12 –
1S
1L
l
1
2
L
9 U(+)
5
14
9 U(+)
POWER*
POWER*
10 V(–)
6
10 V(–)
LOAD
■3-PHASE/4-WIRE
SOURCE
N 1 2 3
FUSE
U
PT
u
V
V
v
v
U
u
P1
P0
P2
FUSE
7 +
14
PULSE OUTPUT
15
8 –
16
11 +
DC OUTPUT
K
12 –
k
1S
k
1L
CT
l
L
P1
CT
SOURCE
1 N 2
l
u
k
■SINGLE-PHASE/3-WIRE
L
V
1
LOAD
K
PT
11 +
DC OUTPUT
K
U
2S
2L
U
PT
u
P1
V
v
P2
U
V
U
V
u
v
u
v
P3
P0
14
7 +
15
8 –
16
11 +
13
12 –
PULSE OUTPUT
DC OUTPUT
K K K
1
k
1S
2
k
5
9 U(+)
6
10 V(–)
POWER*
L
k
l l l
L L
LOAD
1L
CT
2S
2L
3S
3L
Pulse Output Connection Example
■Open Collector
7
+
8
–
1
2
3
4
5
9 U(+)
6
10 V(–)
POWER*
LOAD
*For self-powered model, the auxiliary power supply
terminals are deleted.
The auxiliary-powered transducer model can be
powered from the input voltage when the voltage is
sufficiently stable and meets other supply voltage
requirements.
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EM-1975 Rev.3