360
11 OPTIONS AND PERIPHERAL EQUIPMENT
11.3 FR-BU2-(H) brake unit
■
400 V class
*1 For power supply specifications, refer to the following.
Page 30 Servo amplifier standard specifications
*2 Between P3 and P4 is connected by default. When using the power factor improving DC reactor, remove the short bar between P3 and
P4. Additionally, a power factor improving DC reactor and power factor improving AC reactor cannot be used simultaneously.
Page 407 Power factor improving DC reactors
*3 Connect P/+ and N/- terminals of the brake unit to a correct destination. Incorrect connection destination results in servo amplifier and
brake unit malfunction.
*4 Contact rating: 1a contact, 110 V AC, 5 A/220 V AC, 3 A
Normal condition: TH1-TH2 is not conducting. Abnormal condition: TH1-TH2 is conducting.
*5 Contact rating: 230 V AC, 0.3 A/30 V DC, 0.3 A
Normal condition: B-C is conducting./A-C is not conducting. Abnormal condition: B-C is not conducting./A-C is conducting.
*6 Do not connect more than one cable to each P+ and N- terminals of the servo amplifier.
*7 Always connect BUE and SD terminals. (factory-wired)
*8 Depending on the main circuit voltage and operation pattern, bus voltage decreases, and that may cause the forced stop deceleration to
shift to the dynamic brake deceleration. When dynamic brake deceleration is not required, slow the time to turn off the magnetic
contactor.
*9 Configure a circuit to turn off EM2 when the main circuit power is turned off to prevent an unexpected restart of the servo amplifier.
*10 When wires used for L11 and L21 are thinner than wires used for L1, L2, and L3, use a molded-case circuit breaker.
*11 The illustration of the 24 V DC power supply is divided between input signal and output signal for convenience. However, they can be
configured by one.
ALM
RA1
OFF
RA2
MC
ON
MC
SK
SK
RA2
3
DOCOM
ALM
15
CN3
MC
*8
MCCB
L1
L2
L3
L11
L21
P3
P4
*2
P+
N-
*6
*10
N/-
P/+
BUE
SD
PR
B
C
A
SD
MSG
*3
*5
FR-BU2-H
P
PR
TH2
TH1
*4
*7
RA1
CN3
24 V DC
*11
5
10
EM2
DICOM
DICOM
20
24 V DC
*11
MT-BR5-H
Step-down
transformer
Power
supply
*1
Servo amplifier
Emergency stop switch
Main circuit power supply
*9
Summary of Contents for MELSERVO-J4 series
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