4. SETTING AND PROCEDURE BEFORE OPERATION
MELSEC-A
4-10
4.7.2
Precautions when wiring to a thermocouple
To obtain maximum performance from the functions of AJ65BT-68TD and improve the system
reliability, a wiring with high durability against noise is required. The following describes the external
wiring precautions.
(1) Use separate cables for the AC and the external input signals of the AJ65BT-68TD, in order not
to be affected by the AC side surge or conductivity.
(2) Always place a thermocouple at least 10 cm (3.94 in.) apart from the main circuit line and AC
control circuit line. Place a thermocouple sufficiently apart from circuits with high frequency, such
as high-voltage lines and inverter load main circuits. If they are placed close to each other, the
thermocouple is influenced more easily by the noise, surge, or conductivity.
4.7.3
Wiring example with thermocouple
The following shows the wiring example between AJ65BT-68TD and thermocouple.
Transformer
Transformer
*1 Be sure to use the shielded compensating conductor for the cable.
*2 Be sure to ground.
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