Yaskawa Sigma-5 Safety Precautions for SGDV Servo Amplifier - Manual (Page 17)

3 Wiring
E-15
3.2 Main Circuit Wiring
Do not use SGDV SERVOPACKs in a power-supply environment where a
short-circuit current of 5000 A or more flows after a short circuit occurs.
The maximum available voltage is
• With 100V class: 115 Vrms
• With 200V class: 230 Vrms
• With 400V class: 480 Vrms (neutral grounding)
SERVOPACKs must be used with UL-listed fuses or circuit breakers, in
accordance with the guidelines of the National Electrical Code (NEC).
Use 75 ° C heat-resistant copper wires or an equivalent.
Use a flexible cable for moving parts when the SERVOPACK is used with a
linear servomotor.
3.3 Wire Size and Tightening Torque
„ Cable Types
• Wire sizes are selected for three cables per bundle at 40 ° C surrounding air
temperature with the rated current.
• Use cable with a minimum withstand voltage of 600 V for main circuits.
• If cables are bundled in PVC or metal ducts, consider the reduction ratio
of the allowable current.
• Use heat-resistant cables under high surrounding air or panel tempera-
tures where normal vinyl cables will rapidly deteriorate.
• Use cables within the allowable moment of inertia.
• Do not use cables under continuous regenerative state.
The following table shows the wire size and allowable current for three
cables. Use a cable whose specifications meet or are less than the values in
the table.