User`s manual

4 - 9
MELSEC-
A
4 SETUP AND PREPARATION BEFORE OPERATION
4.8 Wiring
This section provides the instructions for wiring the AJ65SBT-64AD and its wiring with
external equipment.
4.8.1 Wiring precautions
To obtain maximum performance from the functions of AJ65SBT-64AD and improve
the system reliability, an external wiring with high durability against noise is required.
The precautions when performing external wiring are as follows:
(1) Use separate cables for the AC and AJ65SBT-64AD external input signals, in
order not to be affected by the AC side surge or conductivity.
(2) Do not bundle or place with load carrying wires other than the main circuit line,
high voltage line or programmable controller. Noises, surges, or conductivity may
affect the system.
(3) Place a one-point grounding on the programmable controller side for the
shielded line or shielded cable. However, depending on the external noise
conditions, it may be better have a grounding externally.
4.8.2 Module connection example
V+
I+
COM
SLD
V+
I+
COM
SLD
FG1
CH1
*4
*1 Shield
*5
*3
CH4
*2
AG
(1) For voltage input
(2) For current input
Signal source 0 to –10 V
Signal source 0 to –20mA
*1 Shield
500k
500k
500k
500k
250
250
*1 Use a two-core twisted shield line for the power cable.
*2 Indicates the AJ65SBT-64AD input resistor.
*3 For the current input, be sure to connect the (V+) and (I+) terminals.
*4 When noise or ripple occurs with the external cable, connect a condenser with
about 0.1 to 0.47µF (25V or higher voltage-resistant product) between the terminal
V and COM.
*5 Always perform grounding for FG1. When there is a lot of noise, it may be better
ground AG as well.
If the grounding wiring (grounding yes/no) is changed after the offset and gain are
set, perform the setting of the offset/gain values again.