Instruction manual

5. Peripheral Devices
5 - 4
5-2 Selection the AC reactor, contactor and no-fuse breaker
5-2-1 Standard selection
Install an AC reactor, contactor and no-fuse breaker (NFB) per one power supply unit. Refer to the table
below and select them according to each power supply unit capacity.
Selection of AC reactor, contactor and no-fuse breaker (NFB)
Power supply unit
capacity
3.7 to 7.5kW 11kW 15 to 18.5kW 22 to 30kW 37kW
AC reactor B-AL-7.5K B-AL-11K B-AL-18.5K B-AL-30K B-AL-37K
Recommended
contactor
(Special order part)
S-N25 200V S-N35 200V S-N50 200V S-N80 200V S-N150 200V
Recommended
main circuit NFB
(Special order part)
NF50CS3P-40A0
5
NF50CS3P-50A05 NF100CS3P-100A05 NF225CS3P-150A05 NF225CS3P-175A05
An NFB or CP (circuit protector) can be used as the motor fan breaker.
Select the NFB or CP using a value approximately double the motor fan rated current value shown below.
Contact the NFB or CP manufacturer for details on the recommended wire size, etc.
Spindle motor
frame size
71 90 112 132 160 180
Motor fan
rated current
0.1A 0.2A 0.2A 0.2A 0.6A 0.6A
Recommended
motor fan NFB
(Special order part)
* A rush current that is approximately double the above rated current flows when the motor starts.
(Note 1) In the above table, a special order part refers to a part that cannot be ordered from Mitsubishi,
and which must be prepared by the user.
(Note 2) To comply with the EC Directives, use contactors and NFB that comply with the EN/IEC
Standards.
CAUTION
If a breaker is shared by several power supply units, the breaker may not
activate when a short-circuit fault occurs in a small capacity unit. This is
dangerous, so never share the breakers.