Electrical Design Guide
‑31‑
Figure 2‑8 Lead‑out of the motor cable shield
2.2.3 Encoder Cable
2.2.3.1 Rules
● Ground the shielded layers on both the servo drive side and the motor side.
Otherwise, the servo drive will report a false alarm.
● Do not connect cables to the "reserved" terminals.
● Given the voltage drop caused by cable resistance and signal attenuation caused
by distributed capacitance, it is recommended to use twisted‑pair cables of
26AWG or above (as per UL2464 standard) with length no longer than 10 m as the
encoder cable.
Note
It is recommended to use 22AWG to 26AWG cables and a matching terminal AMP170359‑1
for 10B, 20B, 40B, and 75B series motors. If a longer cable is required, increase the cable di‑
ameter properly. See "
Table 2–10 Recommended cables
"
on page 31
for details.
2.2.3.2 Encoder Cable Specifications
Table 2–10 Recommended cables
Cable Size
Cable Size (mm
2
) Ω/km
Allowable Length
(m)
OD (mm)
3P×26AWG 0.13 143 10.0
6.0±0.2
3P×25AWG 0.16 89.4 16.0
6.2±0.2
3P×24AWG 0.2 79.6 18.0
6.5±0.2
3P×23AWG 0.26 68.5 20.9
6.8±0.2
3P×22AWG 0.32 54.3 26.4
7.0±0.2
3P×21AWG 0.41 42.7 33.5
7.3±0.2
3P×20AWG 0.52 33.9 42.2
7.6±0.3
3P×19AWG 0.57 26.9 53.2
8.5±0.3
3P×18AWG 0.81 21.4 66.8
8.8±0.3
3P×17AWG 1.03 16.3 87.7
9.7±0.3
3P×16AWG 1.31 13.5 105.0
11.4±0.3
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