Nidec Commander C200 Power Installation Manual page 98

5.1.22 Maximum motor lengths and types
Since capacitance in the motor cable causes loading on the output of the drive, ensure the cable
length does not exceed the values given in Table 5-24.
Use 105 °C (221 °F) (UL 60/75 °C temp rise) PVC-insulated cable with copper conductors having a
suitable voltage rating, for the following power connections:
• AC supply to external EMC filter (when used)
• AC supply (or external EMC filter) to drive
• Drive to motor
• Drive to braking resistor
Table 5-24 Maximum motor cable lengths
Maximum permissible motor cable length for each of the following switching frequencies
Model
2
kHz
Size 5
200 m (660 ft)
Size 6
Cable lengths in excess of the specified values may be used only when special techniques are
•
adopted; refer to the supplier of the drive.
• The default switching frequency is 3 kHz for Open-loop and RFC-A and 6 kHz for RFC-S mode.
The maximum cable length is reduced from that shown in Table 5-24 if high capacitance or reduced
diameter motor cables are used, refer to section 4.9.2 High-capacitance / reduced diameter
cables on page 58
98
3 4
kHz kHz
150 m
(490 ft)
Unidrive M/HS Frame 5 to 6 Power Installation Guide
6 8
kHz kHz
100 m 75 m
(330 ft) (245 ft)
12 16
kHz kHz
50 m 37 m
(165 ft) (120 ft)
Issue Number: 8