Instructions for encoder cable wiring Use shielded twisted pair cables (0.2 mm 2 or larger) to connect the FR-A8AP. For the wiring to terminals PG and SD, use several cables in parallel or use a thick cable, according to the wiring length. To protect the cables from noise, run them away from any source of noise (such as the main circuit and power supply voltage). Example of parallel connection with two cables (with complementary encoder output) FR-A800 (FR-A8AP) Encoder G F D C B A R S SD *1 When differential line driver is set and a wiring length is 30 m or more.
The wiring length can be extended to 100 m by increasing the 5 V power supply voltage slightly (approximately to 5.5 V) while using six or more 0.2 mm 2 gauge cables in parallel or a 1.25 mm 2 or larger gauge cable. The voltage applied must be within power supply specifications of encoder. To reduce noise of the encoder cable, earth (ground) the encoder's shielded cable to the enclosure (as close as possible to the inverter) with a metal P-clip or U-clip. Earthing (grounding) example using a P-clip Encoder cable Shield P-clip When one encoder is shared between the FR-A8AP and CNC (computerized numerical controller), its output signal should be connected as follows.
In this case, the wiring length between the FR-A8AP and CNC should be as short as possible, within 5 m. Inverter (FR-A8AP) Encoder For details on the optional encoder dedicated cable (FR-JCBL/FR-V7CBL), refer to page 90 . The FR-V7CBL is provided with a P-clip for earthing (grounding) shielded cables. 94 2. INSTALLATION AND WIRING 2.8 Connection to a motor with encoder (Vector control) SD PG Wiring length Parallel connection Larger-size cable Within 10 m At least two cables in parallel Wire gauge 0.2 mm2 0.4 mm2 or larger Within 20 m At least four cables in parallel 0.75 mm2 or larger Within 100 m*1 At least six cables in parallel 1.25 mm2 or larger CNC Maximum 5 m (two parallel cables) NOTE