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ENCODER FEEDBACK CONTROL—A500(L)
4.3 Wiring Instructions
(1) Connection with the speed detector (encoder).
Use twisted pair shielded cables (0.2mm
2
or larger) to connect the FR-A5AP and speed detector
(encoder). Cables to terminals 5V and SG should be connected in parallel or be larger in size according
to the cable length table as indicated below.
To protect the cables from noise, run them (at least 10cm) away from any source of noise (e.g. the main
circuit and power supply voltage).
(2) Cable length.
1)Cable length within 30m.
2)Cable length of more than 30m
Use a power supply slightly higher than 5V (approximately 5.5V) in addition to 6 or more parallel
cables of 0.2mm
2
or cables of 1.25mm
2
or more. This allows the cable length to be increased up to
100m. Note that the voltage applied across terminals 5V-SG must not exceed 6V.
(3) Connection of terminal resistors
Use the jumpers across PA2-PAR and PB2-PBR to connect terminal resistors to the A and B-phases
of the encoder. Normally, keep the jumpers fitted.
However, remove the jumpers when the same encoder is shared between the FR-A5AP and the other
unit (e.g. NC) which is connected with a terminal resistor.
Cable Length
Number of Parallel Cables of 0.2mm
2
Larger-Size Cable
Within 10m
At least 2 cables
0.4mm
2
or larger
Within 20m
At least 4 cables
0.75mm
2
or larger
Within 30m
At least 6 cables
1.25mm
2
or larger