Yokogawa DO402 Dissolved Oxygen Analyzer - Manual (Page 24)

IM 12J05D02-01E
3-4 Installation and wiring
• Never apply power to the DO402G converter and other instruments connected to the DO402G
converter until all wiring is completed.
• This product complies with the CE marking.
Where compliance with the CE marking and relevant standard is necessary, the following wiring is
required.
1. Install an external switch or circuit breaker to the power supply of the DO402G converter.
2. Use an external switch or circuit breaker rated 5A and conforming to IEC 60947-1 or IEC 60947-3.
3. It is recommended that the external switch or circuit breaker be installed in the same room as the
DO402G converter.
4. The external switch or circuit breaker should be installed within reach of the operator and identified
with marking as a power supply switch to the DO402G converter.
5. Power lines such as power cables and contact outputs should be fixed securely onto a wall or
construction using cable racks, conduit tubing, nylon bands or other appropriate ways. Accidental
removal from terminals by pulling may result in electric shock.
3-2-3. Preparation
The relay contact terminals and power supply connections are under the screening (shielding) plate.
These should be connected first. Connect the sensor, outputs and data communication connections last.
Follow the procedures below to open the DO402G for wiring:
1. Loosen the four frontplate screws and remove the cover.
2. Use the rubber knob in the lower right hand corner and swing open the display board to the left.
3. The upper terminal strip is now visible.
4. Remove the screen (shield) plate covering the lower terminal strip.
5. Connect the power supply and contact outputs. Use the three glands at the back for these cables.
6. Replace the screen (shield) plate over the lower terminals.
Always replace the screen plate over the power and contact outputs for safety and to avoid interference.
7. Connect the analog output(s), the sensor input, the contact input and, if necessary, the RS485 serial
bus.
8. Use the front three glands for analog output, sensor input, contact input and communication cabling
(see figure 3-6).
9. Close the display board and switch on the power. Commission the instrument as required or use the
default settings.
10. Replace the cover and secure frontplate with the four screws.
Tighten four frontplate screws to 1.5 N·m torque.
DANGER
WARNING
WARNING