< 3. INSTALLATION, PIPING AND WIRING >
3-37
IM 12A0V2-E
Flow-Through type holder
(PH8HF)
pH converter
(PH400G)
Sensor cable
(Customer wiring)
pH sensor (PH8EFP)
(Customer installation)
Customer
wiring
Power
Ground
Customer
wiring
L2
L1
S
GE
T2
T1
SE
RE
+
-
S1 - S3
FAIL
R1
R2
*1: Be sure to ground the case ground terminal, or if this is not possible then connect to G of power wiring.
Avoid two-point ground. (Case is connected to signal ground inside converter).
*2: Use cable with 9 to 12 mm OD.
*3: Use two-core shielded cable with 9 to 12 mm OD. Avoid two-point ground.
*1
*2
*3
*1
Figure 3.36 Wiring Diagram of ST401G-PH4-N-A (PH400G)
(Customer installation)
(Customer wiring)
Customer
wiring
U1
U2
S
pH holder
(PH8HF)
pH converter
(PH400G)
Ultrasonic oscillator
(PUS400G)
S
GE
T2
T1
SE
RE
L1
L2
L2
L1
Sensor cable
Ultrasonic oscillator
cable
pH sensor (PH8EFP)
GRN
YEL
YEL
YEL
YEL
YEL
YEL
GRN
YEL
YEL
G
Power, Ground
L1
L2
G
Terminal box
L2
L1
G
L2
L1
CB1
GRN
G
L2
L1
CB1: Circuit breaker
+
-
S1 - S3
FAIL
R1
R2
(Note) * Dotted wiring is external wiring and should be prepared by customer.
* Use two-core shielded cable with 9 to 12 mm OD for output wiring.
Avoid two-point ground.
* Ground the G terminal of power wiring.
Figure 3.37 Wiring Diagram of ST401G-PH4-U-A (PH400G)
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