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4.4. Wiring Instructions
(1) Connection with the speed detector (PLG).
Use twisted pair shielded cables (0.2mm
or larger) to connect the FR-A5AP and speed detector (PLG). 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.
Cable Length Number of Parallel Cables
Within 10m At least 2 cables
Within 20m At least 4 cables
Within 30m At least 6 cables
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
or cables of 1.25mm
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 PLG.
Normally, keep the jumpers fitted. However, remove the jumpers when the same PLG is shared between the FR-
A5AP and the other unit (e.g. NC) which is connected with a terminal resistor.