Mitsubishi Electric Melservo MR-J3-100B, Handbook

Page: 516 / 590

Part 8: Review on Replacement of Optional Peripheral Equipment
8 - 31
4.3.4 MR-J4W2-_B servo amplifier, no-fuse breakers, fuses, magnetic contactors
Always use one molded-case circuit breaker and one magnetic contactor with one servo amplifier. When
using a fuse instead of the molded-case circuit breaker, use the one having the specifications given in this
section.
When using a combination of the rotary servo motor select a molded-case circuit breaker, a fuse or a
magnetic contactor tentatively, assuming one type of the servo motors are used for two axes. After the
tentative selections are made for all types of the servo motors, use the largest among all molded-case circuit
breakers, fuses, or magnetic contactors.
(1) For main circuit power supply
CAUTION
To prevent the servo amplifier from smoke and a fire, select a molded-case circuit
breaker which shuts off with high speed.
Always use one molded-case circuit breaker and one magnetic contactor with one
servo amplifier.
(a) For MR-J4W2-_B
Total output of rotary servo motors
Molded-case circuit breaker
(Note 5, 6)
Fuse Magnetic
Contactor
(Note 2) Frame, rated current
Voltage
AC [V]
Class
(Note 1)
Current
[A]
Voltage
AC [V]
300 W or less 50 A frame 5 A (Note 3)
240 T
15
300
S-N10
S-T10
From over 300 W to 600 W 50 A frame 10 A (Note 3) 20
From over 600 W to 1 kW 50 A frame 15 A (Note 3) 20
From over 1 kW to 2 kW 50 A frame 20 A (Note 3) 30
S-N20
(Note 4)
S-T21
Note 1. In order for the servo amplifier to comply with the UL/CSA standard, refer to the applicable "Servo Amplifier
Instruction Manual".
2. Use a magnetic contactor with an operation delay time (interval between current being applied to the coil until
closure of contacts) of 80 ms or less.
3. When not using the servo amplifier as an EC/EN/UL/CSA standard compliant product, molded-case circuit breaker
of 30 A frame can be used.
4. S-N18 can be used when auxiliary contact is not required.
5. A molded-case circuit breaker will not change to select regardless of use of a power factor improving AC reactor.
6. Use a molded-case circuit breaker having the operation characteristics equal to or higher than Mitsubishi Electric
general-purpose products.
(2) For control circuit power supply
When the wiring for the control circuit power supply (L11/L21) is thinner than that for the main circuit
power supply (L1/L2/L3), install an overcurrent protection device (molded-case circuit breaker or fuse) to
protect the branch circuit.
Servo amplifier
Molded-case circuit breaker Fuse (Class T) Fuse (Class K5)
Frame, rated current Voltage AC [V] Current [A] Voltage AC [V] Current [A] Voltage AC [V]
MR-J4W2-22B
50 A frame 5 A (Note) 240 1 300 1 250
MR-J4W2-44B
MR-J4W2-77B
MR-J4W2-1010B
Note. When not using the servo amplifier as an EC/EN/UL/CSA standard compliant product, molded-case circuit breaker of 30 A
frame can be used.