Nidec DFS 1, Руководство по установке электроустановки

Страница: 42 / 61

42
DFS1/DFS2 Power Installation Guide
Issue Number: 2
4.11 High-capacitance / reduced diameter cables
The recommended motor cable has an insulating jacket between the cores and the armour or shield.
These cables have low capacitance between each conductor and all other conductors, including the
shield (typically 130 pF/m). Cables that do not have an insulating jacket tend to have high
capacitance. If a high-capacitance/ reduced diameter cable is used, then the maximum
recommended cable length is half that quoted in Table 4-6. (Figure 4-6 shows how to identify the two
types of cable).
Figure 4-6 Cable construction influencing the capacitance
690 V
xxxx-DFS166EN
250 m (820 ft)
187 m
(614 ft)
125 m
(614 ft)
93 m
(305 ft)
62 m
(203 ft)
46 m
(151 ft)
xxxx-DFS176EN
xxxx-DFS186EN
xxxx-DFS196EN
xxxx-DFS1A6EN
xxxx-DFS1B6EN
xxxx-DFS1C6EN 250 m (820 ft)
187 m
(614 ft)
xxxx-DFS1D6EN 250 m (820 ft)
187 m
(614 ft)
xxxx-DFS1E6EN 250 m (820 ft)
187 m
(614 ft)
xxxx-DFS2A6EN 250 m (820 ft)
187 m
(614 ft)
125 m
(614 ft)
93 m
(305 ft)
62 m
(203 ft)
46 m
(151 ft)
xxxx-DFS2B6EN 250 m (820 ft)
187 m
(614 ft)
125 m
(614 ft)
93 m
(305 ft)
62 m
(203 ft)
46 m
(151 ft)
xxxx-DFS2C6EN 250 m (820 ft)
187 m
(614 ft)
xxxx-DFS2D6EN 250 m (820 ft)
187 m
(614 ft)
xxxx-DFS2E6EN 250 m (820 ft)
187 m
(614 ft)
Model
Maximum permissible motor cable length for each of the following switching
frequencies
2 kHz 3 kHz 4 kHz 6 kHz 8 kHz 12 kHz 16 kHz
Normal capacitance
Shield or armor
separated from the cores
High capacitance
Shield or armor close
to the cores