Yokogawa MH5 User Manual

User’s
Manual

Model MH5
Isolator
(Free Range Type)

IM 77J04H05-01E

Please read through this User’s Manual before use for correct handling.
Please keep this User’s Manual for future reference.

IM 77J04H05-01E

1st Edition Jul. 2005 (YK)

Network Solutions Business Division

2-9-32, Naka-cho Musashino-shi, Tokyo 180-8750 Japan
Phone: [phone] Facsimile: [phone]

CAUTIONARY NOTES FOR SAFE USE OF THE PRODUCT

This User’s Manual should be carefully read before installing and oper­ating the product. The following symbol is used on the product and in
this manual to ensure safe use.

This symbol is displayed on the product when it is
necessary to refer to the User’s Manual for information on
personnel and instrument safety. This symbol is displayed
in the User’s Manual to indicate precautions for avoiding
danger to the operator, such as an electric shock.

The following symbols are used only in this manual.

IMPORTANT

Indicates that operating the hardware or software in a
particular manner may cause damage or result in a system
failure.

NOTE

Draws attention to essential information for understanding
the operations and/or functions of the product.

MODEL AND SUFFIX CODES

Model

Output

1: 1 output

Power supply

1: 15-40V DC (Operating range: 12 to 48 V)
6: 100-240 V AC/DC (Operating range: 85 to 264 V)

Input signal

A:−20 to +20 mA DC (with 250 Ω receiving resistor)
B:−50 to +50 mA DC (with 100 Ω receiving resistor)
1: −10 to +10 V DC
2: −2 to +2 V DC
Z: (Custom order)

Customized current signals or voltage signals

Output signal

A:0 to 20 mA DC Span is 5 mA or more
B:0 to 5 mA DC Span is 1 mA or more
1: −10 to +10 V DC Span is 0.1 V or more
2: −100 to +100 mV DC Span is 10 mV or more
Z: (Custom order)

Customized current signals or voltage signals

Breakpoint linearization

0: Not available
1: Available

CHECKING PRODUCT SPECIFICATIONS AND PACKAGED ITEMS

Optional specification

(1) Checking the Model and Product Specifications

Check that the model and specifications indicated on the nameplate
attached to the main unit are as ordered.

(2) Packaged Items

Check that the package contains the following items:

● MH5: 1

● Receiving resistor (for currrent input): 1

● Spacer (for DIN rail mounting): 1

● Range label: 1

● User’s Manual (this manual: IM 77J04H05-01E): 1
✻ The 250 Ω receiving resistor is attached for the optional specifica-

tion “/R250”; the 100 Ω receiving resistor is attached for the op­tional specification “/R100.”

/SN: Without socket
/R100: With 100 Ω receiving resistor
/R250: With 250 Ω receiving resistor

MH5 -01 - 0 /

GENERAL

The MH5 is a plug-in type isolator that converts DC current or DC volt­age signals into isolated DC current or DC voltage signals.

1

1. MOUNTING METHOD

t

NOTE

Plug/disconnect the main unit into/from the socket
vertically to the socket face. Otherwise the terminals may
bend and it may cause bad contact.

1.1 Wall Mounting

Unfasten the upper and lower stoppers of the isolator to disconnect the
main unit from the socket. Next, anchor the socket onto the wall with
two M4 screws. Then, plug the main unit into the socket and secure
the main unit with the upper and lower stoppers.

Stopper

Main unit

Socket

Mounting

screws

[Mounting Dimensions]

Socket

2-4.5 or 2-M4

Pitch: 56 or more

5 or more

400.2

(51)

1.2 DIN Rail Mounting

Locate the isolator so that the DIN rail fits into the upper part of the
DIN-rail groove at the rear of the socket, and fasten the socket using
the slide lock at the lower part of the socket.

Unit: mm

Note:

• When mounting the units
close together, leave a space
of at least 5 mm between
them.

(85)

• Use the supplied spacer to
keep a space of 5 mm for
DIN rail mounting.

Fit into here

DIN rail

2. INSTALLATION LOCATIONS

● Avoid the following environments for installation locations:
Areas with vibration, corrosive gases, dust, water, oil, solvents, di­rect sunlight, radiation, a strong electric field, and/or a strong
magnetic field
Installation altitude: 2000 m or less above sea level.

● If there is any risk of a surge being induced into the power line
and/or signal lines due to lightning or other factors, a dedicated
lightning arrester should be used as protection for both this isola­tor and a field-installed device.

● Operating temperature/humidity range: 0 to 50C/5 to 90%RH (no
condensation)

3. EXTERNAL WIRING

WARNING

To avoid the risk of an electric shock, turn off the power
supply and use a tester or similar device to ensure that no
power is supplied to a cable to be connected, before carring
out wiring work.

Wires are connected to the terminals of the isolator’s socket. M3.5
screw terminals are provided for the connection of external signals. At­tach a crimp-on lug to each wire for connection to the terminals.

● Recommended cables: A nominal cross-sectional area of 0.5 mm
or thicker for signal cables, and that of 1.25 mm2 or thicker for
power cables.

Receiving resistor

for current inpu

Power Supply

GND

6

L+

7

N−

8

External receiving resistor for current input:

Be sure to attach a supplied 100 Ω or 250 Ω receiving resistor for
current input.

IMPORTANT

Input

+

3

R

4

−

: Receiving resistor

for current input

Output

+

1

−

2

2

Push

DIN rail

Spacer

(Rear of the socket)

Slide lock

1.3 Using Ducts

Wiring ducts should be installed at leaset 30 mm away from the top or
bottom of the main unit.

●

The power line and input/output signal lines should be
installed away from noise-generating sources. Other
wise accuracy cannot be guaranteed.

●

The grounding resistance must be 100 Ω (JIS Class D
grounding). The length and thickness of the grounding
cable should be as short and thick as possible. Directly
connect the lead from the ground terminal (terminal no.

6) of the product to the ground. Do not carry out daisy­chained inter-ground terminal wiring.

●

Use of the product ignoring the specifications may
cause overheating or damage. Before turning on the
power, ensure the following:
(a) Power supply voltage and input signal value applied

to the product should meet the required
specifications.

(b) The external wiring to the terminals and wiring to

ground are as specifications.

●

Do not operate the product in the presence of
flammable or explosive gases or vapors. To do so is
highly dangerous.

●

The product is sensitive to static electricity; exercise
care in operating it. Before you operate the product,
touch a nearby metal part to discharge static electricity.

2

IM 77J04H05-01E 1st Edition Jul 29, 2005-00