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12. OPTIONS AND AUXILIARY EQUIPMENT
2) Grounding
For grounding, use the wire of the size equal to or greater than that indicated in the following
table, and make it as short as possible.
Power regeneration common converter Grounding wire size [mm
2
]
FR-CV-7.5K TO FR-CV-15K 14
FR-CV-22K • FR-CV-30K 22
FR-CV-37K • FR-CV-55K 38
(b) Example of selecting the wire sizes
When connecting multiple servo amplifiers, always use junction terminals for wiring the servo
amplifier terminals P, N. Also, connect the servo amplifiers in the order of larger to smaller
capacities.
R2/L
1
S2/L
2
T2/L
3
R/L11
S/L
21
T/MC1
P/L
N/L
P
N
50mm
2
Overall wiring length 5m or less
First unit:
50mm assuming that the total of servo amplifier
capacities is 27.5kW since 15kW + 7kW + 3.5kW
+ 2.0kW = 27.5kW.
P
N
P
N
P
N
22mm
2
8mm
2
3.5mm
2
22mm
2
8mm
2
5.5mm
2
3.5mm
2
Junction terminals
Wire as short as possible.
Second unit:
22mm assuming that the total of servo amplifier
capacities is 15kW since 7kW + 3.5kW + 2.0kW =
12.5kW.
Third unit:
8mm assuming that the total of servo amplifier
capacities is 7kW since 3.5kW + 2.0kW = 5.5kW.
Fourth unit:
3.5mm assuming that the total of servo amplifier
capacities is 2kW since 2.0kW = 2.0kW.
FR-CV-55K Servo amplifier (15kW)
Servo amplifier (7kW)
Servo amplifier (3.5kW)
Servo amplifier (2kW)
2
2
2
2
(Note)
(Note)
(Note)
Note. For 7kW or less servo amplifier, always remove the wiring (3.5kW or less: across P-D, 5k 7kW: across P-C) of built-in
regenerative resistor.
(4) Other precautions
(a) Always use the FR-CVL as the power factor improving reactor. Do not use the FR-BAL or FR-BEL.
(b) The inputs/outputs (main circuits) of the FR-CV and servo amplifiers include high-frequency
components and may provide electromagnetic wave interference to communication equipment
(such as AM radios) used near them. In this case, interference can be reduced by installing the
radio noise filter (FR-BIF) or line noise filter (FR-BSF01, FR-BLF).
(c) The overall wiring length for connection of the DC power supply between the FR-CV and servo
amplifiers should be 5m or less, and the wiring must be twisted.