YOKOGAWA Vigilantplant ST401G - Page 52

< 3. INSTALLATION, PIPING AND WIRING >
3-38
IM 12A0V2-E
(Customer installation)
G
L2
L1
Power
Output
Terminal box
U1
U2
S
pH holder
(PH8HF)
pH converter
(PH400G)
(PUS400G)
S
GE
T2
T1
SE
RE
+
-
S1 - S3
L2
L1
FAIL
R1
R2
Sensor cable
Ultrasonic oscillator
cable
pH sensor (PH8EFP)
CB1
L1
G
L2
L2
AR2x2
AR1
1
2
G
L1
L2
-
+
S
-
+
L1
G
(Customer
wiring)
AR1,2: arresters
CB1: Circuit breaker
Ground
(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.
Ultrasonic oscillator
(Suffic code: -U)
Figure 3.38 Wiring Diagram of ST401G-PH4--A/ARS (PH400G)
Flow-Through type holder
(PH8HF)
pH converter
(PH450G)
Sensor cable
(Customer wiring)
pH sensor (PH8EFP)
(Customer installation)
Customer
wiring
Power
Ground
Customer
wiring
*1: Be sure to ground the case ground terminal, or if this is not possible then connect to G of power wiring.
A
void 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
*3
*2
*1
(Note) For the jumper wiring, refer to user’s manual of PH450G.
2N
1L
(S)16
(GE)15
(SE)14
(T1)11
(T2)12
(RE)13
IMPLOW
61(+)
62(-)
63
S1 to S3
S4
mA1
Jumper
(Note)
Figure 3.39 Wiring Diagram of ST401G-PH5-N-A (PH450G)