Yokogawa EXA DC402 Dual-Channel Conductivity Analyzer - Manual (Page 17)

IM 12D08E02-01E
3-6 Installation and wiring
Figure 3-7. Input and output connections
3-3-3. AC power
Connect terminal 1 to the phase line of the AC power and terminal 2 to the zero line. The size of con-
ductors should be at least 1.25 mm 2 . The overall cable diameter should be between 6 & 12 mm (0.24 &
0.47 in).
3-3-4. Grounding the housing
Protective grounding must be made to prevent electric shock.
To protect the instrument against interference, the housing should be connected to ground by a large
area conductor. This cable can be fixed to the rear of the housing using a braided wire cable.
See figure 3-8.
Please be sure to connect protective grounding of
DC402G with cable of 1.25 mm 2 or larger cross sec-
tion in order to avoid the electrical shock to the opera-
tors and maintenance engineers and prevent the
influence of external noise. And further connect the
grounding wire to the mark (100Ω or less).
3-3-5. Switching on the instrument
After all connections are made and checked, the
power can be switched on from the power supply.
Make sure the LCD display comes on. All segments
will illuminate, then the instrument will momentarily
display its unique serial number. After a brief inter-
val, the display will change to the measured value. If
errors are displayed or a valid measured value is not
shown, consult the troubleshooting section (Chapter
8) before calling Yokogawa.
Figure 3-8. Grounding the housing
DANGER
CAUTION
71
S4 S3 S2 S1
C NC NO
72 73 51 52 53 41 43 31 33 42 32
250VAC
5A
100VA
250VDC
5A
50W
FUSE
115
230
250VAC; T 200mA
3 1 2
G N L
C NC NO C NC NO C NC NO
VAC
VAC
12 11 14 15 22 21 63 66 65 62 61 95 94 93 92 91
Sensor inputs
SENSOR 1
12 11 14 15
mA Outputs
CONT SENSOR 2 mA OUTPUT
Relay Contacts Power Supply
Temp Temp
mA2 mA1
Screen
250VAC; T 100mA
DC402 REFER TO INSTRUCTION MANUAL FOR CONNECTIONS
23
Screen
(M4 screw)