Yokogawa DO402 Dissolved Oxygen Analyzer - Manual (Page 25)

IM 12J05D02-01E
Installation and wiring 3-5
Figure 3-6. System configuration
3-3. Wiring the power supply
3-3-1. General precautions
Make sure the power supply is switched off. Also, make sure that the power supply is correct for the
specifications of the EXA and that the supply agrees with the voltage specified on the textplate. Remove
the front cover by unscrewing the four screws to check this textplate on the top of the display board.
Local health and safety regulations may require an external circuit breaker to be installed. The instru-
ment is protected internally by a fuse. The fuse rating is dependent on the supply to the instrument. The
250 VAC fuses should be of the “time-lag” type, conforming to IEC60127.
The internal fuse is located next to the power terminals (in the lower right hand corner).
Use only a fuse of the specified current, voltage and type ratings to prevent fire. For fuse replacement,
refer to Section 7-3, “Fuse Replacement.”
DANGER
FRONT GLANDS
Sensor
Output
signals
RS485
Power
Contact
output
Contact
output
REAR GLANDS
Contact intput
S1
S2
S3
S4/FAIL