Yokogawa GD40 Gas Density Detector - Manual (Page 39)

<2. Installation, Wiring and Piping>
2-16
IM 11T3E1-01E
2.4.2 Cables Wired to Power Supply
The GD402G bears the CE marking. When using the meter in a place where the CE marking is
obligatory, or when performance meeting the CE marking requirements is needed, the following
wiring is required. (Note that the following wiring is not required when the power supply is 24 V
DC.)
● Install an external switch or circuit breaker to the power supply of the converter.
● Use an external switch or circuit breaker that is rated at 5 A and conforms to IEC 947-1 or
IEC 947-3.
● Install the external switch or circuit breaker in the same room as the converter is installed.
● The external switch or circuit breaker should be installed in a location that allows operator
access and should be marked a power supply switch to the converter.
● Connect the supplied surge protector to the power supply. This protects the power supply
circuit of the converter from surge.
CAUTION
The GD402R, T, V converter contains a power switch and a fuse. The switch cannot be operated
however, if the converter is installed in an explosion-hazardous area; it must be left placed in the
ON position. When Power ON/OFF, use external circuit breaker
Wiring is for supplying power supply that meets specifications to the GD402 converter.
Use a 3-conductor cable with a size of 1.25 to 2.5 mm 2 and an outside diameter of 8 to 16 mm
for 100-240 V AC type and a 2-conductor cable for 24 V DC type. A surge protector is not pro-
vided with the GD402T, V, R type converter.
Wire the cable as instructed below:
(1) Strip the sheath 7 mm at the cable end to be connected to the converter.
(2) Connect the cable to terminals L, N, and G or terminals + and - on the converter.
Loosen the terminal screw, insert the stripped part of the wire into the terminal hole,and fix
the cable by tightening the screw. (adequate tightening torque: 0.4 N·m)
(3) The length of wire between the converter and a connecting device for the surge protector
should not exceed 1 m.
(4) To connect the surge protector, use a terminal box or relevant device. Wires of the surge
protector have a M4 ring terminal crimped.
(5) Connect black cables of the surge protector to terminals L and N, and the green cable to
terminal G. (Terminal G is internally connected to the case-grounding terminal.)