Hitachi SJ7002 Series Instruction Manual page 216

4–54
Using Intelligent Output Terminals
Brake Control
Signals
19=[BRK]
Opt. Code
and
20=[BER]
Symbol
[11 to [15],
Valid for
[ALx]
Outputs
B120, B121,
Required B122, B123,
B124, B125,
Settings
B126
Default
Requires
config.
terminals
Expansion Card
Output Signals
21=[ZS]
Opt. Code
22=[DSE]
and
Symbol
23=[POK]
[11 to [15],
Valid for
[ALx]
Outputs
Required
C061
Settings
Default
Requires
terminals config.
The Brake Control function enables the inverter to control external braking systems with a
particular safety characteristic. The brake release logic convention is such that an open circuit
fault (such as loose wire) causes the external brake to engage. A complete discussion of the
operation of brake control is in
below shows the signals that are important to the External Brake Control function.
Inverter
Symbol Function Name
BRK Brake Release
BER Brake Error
Other outputs listed below require expansion card SJ-FB Encoder Feedback board. Please see
the SJ-FB manual for more information.
Opt.
Symbol Function Name
Code
21 ZS Zero Speed Detect signal
22 DSE Speed Deviation Excessive
23 POK Positioning Completion
"External Brake Control Function" on page
[BRK] Brake release
[BOK] Brake confirmation
[BER] Brake error
Input
State
ON when the inverter signals the external brake
system to release (open) its brake
OFF when the inverter is not driving the motor, and
needs the external brake engaged
ON when the output current is less than the set
releasing current
OFF when the brake function is not in use, or when
the output current to the motor is correct and
it is safe to release the brake
Signal indicates the encoder pulses of the
motor have stopped
Velocity error exceeds the error threshold
defined by parameter P026
Indicates the load position is at the target
4–32. The diagram
Brake System
Emergency Brake
Description
Description