bnp-b2365(eng)b.pdf - 第79页
2. Wiring and Connection 2 - 40 (3) Operation sequences w hen an emergency stop occurs The motor brake control output operation when an em ergency stop occurs differs according to the motor deceleration stop method. Refe…
2. Wiring and Connection
2 - 39
2-6 Wiring of the motor brake
2-6-1 Wiring of the motor magnetic brake
The magnetic brake of servomotors with a magnetic brake is controlled by the motor brake control
connector (CN20) on the servo drive unit. The servo drive unit releases the brake when the motor is ON.
(Servo ON means when torque is generated in the motor.)
(1) Motor brake release sequence
The motor brake control output (CN20: MBR) releases the magnetic brake in the sequences in the
following drawing when canceling the emergency stop. The brake is released after the start of the
power ON to the servomotor.
ON
Cancel
Emergency stop (EMG)
ON
OFF
Servo ready signal (RDY)
ON
OFF
Servo ready completion
signal (SA)
0
500 1000 1500
Time (ms)
Command input enable
Cancel
ON
Motor brake control
output (MBR)
Dynamic brake
Cancel
ON
Ready completion
Motor brake control sequences when an emergency stop is canceled
(2) Control during the servo OFF command
When a servo OFF command is input by an NC sequence input, the motor brake turns ON
simultaneously when the motor ON is shut off. Note that the vertical axis drop prevention control is
not validated, so a drop due to the brake operation lag occurs. When the servo OFF is canceled, a
drop due to an uncontrolled state does not occur.
SERVO ON
SERVO OFF
Servo OFF command
OFF
ON
Motor brake control output
CN20 connector (MBR)
Dynamic brake
OFF
ON
Motor ON (GATE)
ON
OFF
Motor brake control sequences when a servo OFF command is output
200ms
CAUTION
1. The vertical axis drop prevention control only is performed during an
emergency stop (including alarms and power failures). It is not performed
when a servo OFF command is input.
2. A servo OFF command is required at both axes in order to perform a motor
brake control output (MBR) at 2-axis drive unit.
2. Wiring and Connection
2 - 40
(3) Operation sequences when an emergency stop occurs
The motor brake control output operation when an emergency stop occurs differs according to the
motor deceleration stop method. Refer to section "4-5 Setting for emergency stop" for details on the
operation sequences for each stop method.
(4) Motor brake control connector (CN20) output circuit
As shown in the illustration below, an external power supply circuit is controlled by the CN20
connector output. Dynamic brake unit is controlled simultaneously for large-capacity drive unit
(MDS-C1-V1-110/150). Refer to "2-6-2 Dynamic brake unit wiring" for details.
（Unit internal relay specification: 5A 30Vdc/8A 250Vac）
CAUTION
1. Always install a surge absorber near the motor's brake terminal to eliminate
noise and protect the contacts.
2. The brakes cannot be released just by connecting the CN20 and motor brake
terminal. 24VDC must be supplied.
POINT
To ensure safety in an emergency, make sure that the magnetic brakes are
applied in sequence with the emergency stop switch.
A
lways install a surge
absorber
Brake
MDS-C1-V1/V2
3 MBR2
2
DBR
1 MBR1
CN20
24VDC
Surge
absorber
Emergenc
y
stop switch
2. Wiring and Connection
2 - 41
2-6-2 Dynamic brake unit wiring
The 11kW and larger servo drive unit does not have built-in dynamic brakes. Always install a dynamic
brake unit.
The 9kW and smaller servo drive unit has built-in dynamic brakes.
CAUTION
Correct wire the dynamic brake unit to the servo drive unit.
Do not use for applications other than emergencies (normal braking, etc.). The
internal resistor could heat up, and lead to fires or faults.
POINT
When you use a servomotor with a brake, please wire (between 1pin and 3pin)
of CN20 connector.
Control terminal
block
（M3）
U V W
CNU20S(AWG14)
a b
Name
NC
a
2
1
Pin
3
b 4
5
6
13
14
External
power supply
24VDC GND
Dynamic brake unit
(MDS-B-DBU-150)
Drive terminal
block
（M3）
Name
V
W
2
1
Pin
3
U
1
2
3
Motor with a brake
Twist wire
Brake connector
（CN20）
Name
24VDC
DBU
MBR
2
1
Pin
3
Servomotor
MDS-C1-V1-110/150