YOKOGAWA SC200 User Manual

IM 12D7B2-E-H
3-3. Wiring of power supply
3-3-1. General precautions
Do not activate the power supply yet.First
make sure that the DC-power supply is
according to the specifications given.
WARNING: DO NOT USE ALTERNATING
CURRENT OR MAINS POWER SUPPLY! !
The cable leading to the distributor (power
supply) or safety barrier transports power to
and output signal from the transmitter. Use
a two conductor shielded cable with a size
of at least 1.25 mm
2
and an outside diame-
ter of 9 to 15 mm. The cable gland supplied
with the instrument accepts these diame-
ters. The maximum length of the cable is
2000 metre. This ensures the minimum ope-
rating voltage for the instrument.
3-3-2. Additional precautions for
installation in hazardous areas
1. Ensure that the total of capacitances
and inductances connected to the termi-
nals of the EXA SC200 do not exceed the
limits given in the certificate of the safety
barrier or distributor.
2. The cable used should preferably have a
BLUE colour or marking on the outside.
3. Grounding:
• If the transmitter is mounted on a
grounded surface (e.g. a metal frame
fixed in the soil) the shield of the 2-wire
cable may NOT be connected to
ground at the distributor.
• If the transmitter is mounted on a non-
conducting surface (e.g. a brick wall) it is
recommended to ground the shield of the
2-wire cable at the distributor end.
4. Installation for EEx ia (sensors in Zone 0
or 1):
Generally, the distributor with input/output
isolation has no external earth connection.If
there is an earth connection on the distribu-
tor and the external connection of the trans-
mitter is connected to ”protective” earth, the
shield of the 2-wire cable may NOT be con-
nected to ”protective” earth at the distributor
too.
3-3-3. Access to terminal and cable
entry
The terminal strip is accessed by removing
the cover from the transmitter as was des-
cribed in § 3-2-4.
Use the left-hand gland to insert the 2-wire
cable to the transmitter.
Connect the supply to the terminals marked
+, - and G as is indicated in the figures on
pages 9 & 10.
3-3-4. Power on
After all connections are made and chec-
ked, the power can be switched on from the
distributor. Observe the correct activation of
the instrument at the display.If for any rea-
son the display does not indicate a value,
consult the trouble shooting section.
8

YOKOGAWA SC200 Specifications

General

Brand	YOKOGAWA
Model	SC200
Category	Transmitter
Language	English