<Start-up and Safety Precautions>
10
IM 12E01B30-01EN
1st Edition : Mar. 30, 2021-00
CAUTION
Turn off power supply to TB820D before wiring. Power rating must comply with TB820D
specifications. Power voltage must match with the one indicated on the name plate.
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 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 including wire cables of
power supply by using stanchion, cable rack, conduit or vinyl band.
Unplugged cables are dangerous and may cause an electric shock.
CAUTION
When you open the front cover on the detector and Relay Box, make sure the screws
are completely out of the screw holes, and then open the front coverl 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.
Wiring of TB820D
WARNING
Never let the power cable touch SENCOM cable, resulting in failure to comply with
safety requirements.
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.