Electrical Design Guide
‑45‑
The following table lists the maximum number of nodes and transmission distance
supported by the standard RS485 circuit at different transmission rate.
Table 3–13 Transmission distance and number of nodes
No.
Transmission
Rate (kbps)
Transmission
Distance (m)
Number of
Nodes
Cross Sectional
Area
1 115.2 100 128 AWG26
2 19.2 1000 128 AWG26
3.5 Cable Routing
3.5.1 Routing Precautions
● Do not connect the input power supply cables to the output terminals U, V, and W.
Failure to comply will damage the servo drive.
● When cables are bundled in a duct, the cooling effect will be deteriorated. In this
case, take the permissible current reduction ratio into account.
● High voltage may be still present in the servo drive after the power supply is
switched off. Do not touch the power supply terminals within 5 minutes after
power‑off.
● Do not switch on/off the power supply frequently. If the power supply is switched
on or off frequently within 1s, E740.0/E136.0/E430.0 may occur (see
"Troubleshooting" in SV670P Series Servo Drive Commissioning Guide). In this
case, power on the servo drive again after waiting for the specified ON/OFF
interval. If frequent ON/OFF operation is needed, the time interval between ON
and OFF must be at least 1 min.
The servo drive carries a capacitor in the power supply part, and this capacitor will
be charged with a high current for 0.2s upon power‑on. Turning on/off the power
supply frequently affects the performance of main circuit components inside the
servo drive.
● Do not power on the servo drive if terminal screws or cables are loose. Failure to
comply may lead to a fire.
Observe national or regional regulations when selecting cable dimensions.
Requirements on IEC cable selection:
● EN 60204‑1 and IEC 60364‑5‑52 standards
● Copper conductors with PVC insulation
● Heat resistance: 40°C ambient temperature and 70°C cable surface temperature
(Contact the manufacturer if the ambient temperature exceeds 40°C.)
For details about requirements on UL cable selection, see "
Cable requirements
"
on
page 98
.
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