Wiring Of Power Supply; General Precautions; Connection Of The Power Supply; Switching The Instrument On - YOKOGAWA SC202G (S) User Manual

3-5Installation and wiring
3-3-3. Installation in: Hazardous Area-Non-Incendive
The SC202S-N may be installed in a Category 3/ Zone 2/ Div.2 area without the use of safety barriers.
Maximum permissible supply voltage 31.5V

3-4. Wiring of power supply

3-4-1. General precautions

Do not activate the power supply yet. First make sure that the DC-power supply is according to the
specifications given.
mA
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
diameter of 7 to 12 mm. The cable gland supplied with the instrument accepts these diameters. The
maximum length of the cable is 2000 metre, or 1500 metres when using the communications. This ensures
the minimum operating voltage for the instrument.
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.

3-4-2. Connection of the power supply

The terminal strip is accessed as was described in section 3-2-1. Use the left-hand gland to insert the
supply/
output cable to the transmitter. Connect the supply to the terminals marked +, - and G as is indicated in
figures 3-11.
mA

3-4-3. Switching the instrument on

After all connections are made and checked, the power can be switched on from the distributor. Observe
The terminations of the WU40.LH x x
the correct activation of the instrument at the display. If for any reason the display does not indicate a value,
cable are as shown.
consult the trouble shooting section.
6 1 2
5
3
4
Fig. 3-7. Connection diagrams
IM 12D7B3-E-E
and an outside
2
11
white
12
brown
green
13
14
yellow
15
grey
pink
16