YOKOGAWA TB820D, User Manual, Page: 17 / 87

<2. INSTALLATION, PIPING, AND WIRING>
2-6
IM 12B01B30-02EN 2nd Edition : June 09 , 2021-00
WARNING
● Use wiring cables with heat resistance above 75 °C, waterproof rating IP65 or higher.
● Tightening torque to the four screws of Smart Box cover is 1.4 N·m.
● For power supply, wire cables with a flammability rating of UL 2556 VW-1 or equivalent
CAUTION
• When you open the front cover of FLXA402T, make sure the screws are completely out of
the screw holes, and then open the front cover slowly in order not to damage the threaded
parts on the housing. If the threaded parts are damaged and the screws cannot be
tightened, the waterproof performance will deteriorate.
• Be careful not to lose the four screws on the front cover of the FLXA402T.
2.1.1 SENCOM cable for turbidity and chlorine (A)
Dedicated cable is supplied with the product. For the wiring of FLXA402T, read FLXA402T
Installation and Wiring IM 12A01G01-02EN section 2.6.1.
2.1.2 Power cable for FLXA402T (B)
Dedicated cable is supplied with the product.
Both ends are terminated at different lengths. Connect the longer one (approx. 80 mm) to Smart
unit side, the shorter one (approx. 50 mm) to FLXA402T side.
Cables have no name on them so wire them by color: L; Black, N; White, G; Red.
Fasten the M3 screw (L, N) (Figure 2.8) with the tightening torque of 0.6 N·m, M4 screw (G) with
1.4 N·m.
2.1.3 Power supply cable (C)
WARNING
● You must install external power supply switch or circuit breaker for power supply.
● The external power supply switch or a circuit breaker must comply with a current rating of
5Aor IEC60947-1 or IEC60947-3
● Yokogawa recommend installing the external power supply switch, circuit breaker and
TB820D converter all in the same location.
● Install the external power supply switch or circuit breaker to the place where operators
access easily. To alert users, put a label on the external power switch.
● Fix securely onto constructions or walls all power lines by using cable rack, conduit or vinyl
band. Unplugged cables are dangerous and may cause an electric shock.
Provide the smart unit with a power supply whose voltages and frequencies conform to the
specifications. Grounding wiring also must be made to prevent electric shock and to prevent the
instrument from being affected by noise. Power supply and grounding cable must be provided by
customers. The specification of the cables is described in the following table.