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Installation

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ASDA-A3

2

2.9 The use of braking

A brake is usually used for motions in the Z-axis direction because gravity causes the

mechanism to fall. A brake can prevent the mechanism from falling and reduce the motor’s

excessive resistance. The motor lifespan could be reduced due to the excessive heat generated

by continuous resistance. To avoid incorrect operation, the brake can be enabled only when the

servo is switched off. The drive controls the brake with DO. If DO.BRKR is set to off, it means

the brake is not operating and the motor is clamped; if DO.BRKR is set to on, it means the

brake is operating and the motor can run freely. You can use MBT1 (P1.042) and MBT2

(P1.043) to set the delay time.

Timing diagram of brake control:

SON

(DI input)

BRKR

(DO output)

OFF

OFF

ON

ON

MBT1 (P1.042)

OFF

OFF

MBT2 (P1.043)

ZSPD (P1.038)

Motor speed

ZSPD (P1.038)

Motor speed

Output timing of the BRKR signal:

1. When the servo drive is off and the time set for P1.043 is exceeded, but the motor speed is

still higher than the speed set for P1.038, DO.BRKR is off (the motor is clamped).

2. When the servo drive is off and the time set for P1.043 is not yet reached, but the motor

speed is already lower than the speed set for P1.038, DO.BRKR is off (the motor is

clamped).

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