Hitachi SJ300 Series Brake Control Signals, Expansion Card Output Signals

4–58

Using Intelligent Output Terminals

Brake Control Signals

The Brake Control function enables the inverter to control external braking systems with a particular safety characteristic. A complete discussion of the operation of brake control is in “External Brake Control Function” on page 4–39. The block diagram and table that follow describe the configuration of the outputs [BRK] Brake Release and [BER] Brake Error.

Inverter

[BRK] Brake release

Brake System

[BOK] Brake confirmation

[BER] Brake error

Emergency Brake

Operations and Monitoring

Opt.

Symbol

Function Name

Output

Description

Code

State

19

BRK

Brake Release

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

20

BER

Brake Error

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

Valid for

11, 12, 13, 14, 15,

Example: (Requires output configuration—

outputs:

AL0 – AL2

see page 3–53.)

Required

B120, B121, B122, B123,

Inverter output

BRK

settings:

B124, B125, B126

terminal circuit

BER

Notes:

• The brake release logic convention is such that

an open circuit fault (such as loose wire)

14

13

11

causes the external brake to engage.

See I/O specs on

15

CM2

12

page 4–9.

		+
RY	RY	–

Expansion Card Output Signals

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	Description
Code
21	ZS	Zero Speed Detect signal	Signal indicates the encoder pulses of the
			motor have stopped
22	DSE	Speed Deviation Excessive	Velocity error exceeds the error threshold
			defined by parameter P026
23	POK	Positioning Completion	Indicates the load position is at the target