Mitsubishi Electric ME96SSEB-MB, Руководство пользователя

Страница: 7 / 100

6
Safety Precautions
■
Precautions on Installation and wiring
Be sure to read the instructions carefully before installation and wiring.
CAUTION

A qualified electrician must install and wire the instrument for safety.

Supply power to the instrument after completing its assembly work on a cabinet door.

The instrument is to be mounted on the cabinet door. All connections must be kept
inside the cabinet.

The following table shows the specifications on the input/output terminal.
■
Auxiliary power supply and measuring element
Auxiliary power supply
100 to 240 V AC (±15%) 50 Hz to 60 Hz
100 to 240 V DC (-30%
＋
15%)
MA, MB
terminal
Measuring
element
Voltage
3-phase 4-wire: max 277 V AC/480 V AC
3-phase 3-wire: (DELTA) max 220 V AC
(STAR) max 440 V AC
1-phase 3-wire: max 220 V AC/440 V AC
1-phase 2-wire: (DELTA) max 220 V AC
(STAR) max 440 V AC
Category III
P1, P2, P3,
PN terminals
Current
5 A (CT secondary side),
max 30 V AC
Category III
+C1, C1, +C2,
C2, +C3, C3
terminals
Frequency 50 Hz or 60 Hz
The current input terminals must be connected to a CT, external equipment, with basic
insulation.
Be sure to continuously connect the terminals for voltage-measuring purpose and current-
measuring purpose during operation.
■
Others
MODBUS RTU
communication
T/R+,T/R-,SG terminals max 35 V DC

Keep the protection sheet affixed to the front of the instrument during installation and
wiring.

Do not drop the instrument from high place. If it is dropped and the display cracks, do
not touch the liquid leaking from the broken LCD or do not get it in your mouth. If you
touch the liquid, rinse it off with soapy water at once.

Do not work under live-line condition. Otherwise, an instrument failure, an electric shock,
or a fire may be caused.

When tapping or wiring, take care not to enter any foreign objects such as chips or wire
pieces into the instrument.

If you pull the wires with a strong force when connecting them to the terminals, the
terminals may come off. (Tensile load: 39.2N or less)

Check the wiring diagram carefully. Inappropriate wiring can cause a failure of the
instrument, an electric shock, or a fire.

Use appropriate size wires. The use of an inappropriate size wire can cause a fire due
to heat generation.

Use crimp-type terminals compatible with the wire size. For details, refer to 7.3.1
Specifications on the Applicable Electrical Wire . The use of an inappropriate terminal
can cause a malfunction, failure, or burnout of the instrument or a fire due to damage to
the terminal or poor contact.

Tighten the terminal screws with a specified torque and use a suitable pressure
connector. For details, refer to 7.3.1Specifications on the Applicable Electrical
Wire . Excessive tightening can cause damage to the terminals and screws.

Be sure to confirm the wiring connections strictly after the connection. Poor connection
can cause a malfunction of the instrument, an electric shock, or a fire.

In order to prevent invasion of noise, MODBUS RTU communication cables, auxiliary
power supply cables, and other signal cables must not be placed close to or bound
together with power lines or high voltage lines. When lying parallel to the power lines or
high voltage lines, refer to the following table for the separation distance. (Except the
input part of the terminal block)
Conditions Distance
Power lines of 600 V or less 300 mm or more
Other power lines 600 mm or more