M-system M8CT 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 + CT protector)...........................(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:
24V DC rating: 24V ±10%, approx. 30mA
(50mA for current output)
■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 0 to 55°C (32
to 131°F) with relative humidity within 30 to 95% RH in
order to ensure adequate life span and operation.
• Be sure that the ventilation slits are not covered with ca-
bles, etc.
■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
Specifications
Span Adj.
Zero Adj.
Mounting Screw
Body
CT Protector
AB
DC
■WARNING – The CTR Must Be Connected Correctly.
1) The CT protector (model: CTR) included in the product
package must be used for safe operations. Turning on the
CT without connecting the CTR opens the circuit and is
potentially dangerous.
2) The CTR is not interchangeable with another. Be sure to
match the serial No. of the CTR to that of the converter.
3) Connect the CTR’s wires (C, D) and metal legs (A, B) to
the corresponding terminals of the installation base as
indicated in the figure to the right. The metal legs (A, B)
are to be secured at the base terminals together with the
output wires from the CT. Wrong connection may cause
abnormally high temperature in the unit which could
lead a fire in the worst cases.
4) Confirm the right connection of the CTR again before
turning on the CT.
INSTALLATION
Use Installation Base (model: M8BSx).
CT CONVERTER MODEL M8CT
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]
EM-5482 Rev.6 P. 1 / 2
INSTRUCTION MANUAL

TERMINAL CONNECTIONS
Connect the unit as in the diagram below.
■EXTERNAL DIMENSIONS unit: mm (inch)
I/O PINS
17.5 (.69)
48 (1.89)
75 (2.95)
83 (3.27)
■CONNECTION DIAGRAM
+
–
Installation Base
OUTPUT 1
6
7
8
9
10
11
+
–
+
–
OUTPUT 2
POWER
3
1
2
4
D
A
B
C
LOAD
SOURCE
k
l
CT
L
K
CT PROTECTOR
model: CTR
Be sure to use the CTR included in the package.
Tu rning the CT on without connecting the CTR will open the circuit.
CHECKING
1) Terminal wiring: Check that all cables are correctly con-
nected according to the connection diagram. Check that
the CT Protector (CTR) is connected on the base termi-
nal.
2) Power input: Check the power input voltage.
3) Input: Check that the input signal is within 0 – 100% of
the full-scale.
4) 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.
■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.
(Output 1 and Output 2 are linked.)
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.
M8CT
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: [phone] Fax: [phone] E-mail: [e-mail]
EM-5482 Rev.6 P. 2 / 2