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4. SETTING AND PROCEDURE BEFORE OPERATION
4.7.2
To obtain maximum performance from the functions of AJ65BT-64RD 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-64RD, in order not
to be affected by the AC side surge or conductivity.
(2) Always place a platinum temperature-measuring resistor at least 10 cm (3.9 in.) apart from the
main circuit line and AC control circuit line. Place a platinum temperature-measuring resistor
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 platinum temperature-measuring
resistor is influenced more easily by the noise, surge, or conductivity.
4.7.3
(1) The highest accuracy can be obtained if a 3-wire type platinum temperature-measuring resistor is
used for AJ65BT-64RD3.
The following shows a connection example of a 3-wire type platinum temperature-measuring
resistor.
*1 May be better to connect depending on the operating environment.
(2) A 4-wire type or 2-wire type platinum temperature-measuring resistor can also be used for
AJ65BT-64RD3.
Connect as shown in the diagrams below when using a 4-wire type or 2-wire type platinum
temperature-measuring resistor.
Precautions when wiring to a platinum temperature-measuring
resistor
Connecting AJ65BT-64RD3 and platinum temperature-measuring
resistor
4-wire type
2-wire type
A
B
b
SLD
4-11
MELSEC-A
A
B
b
SLD
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