Delta ASD-A2-0121 Series User Manual page 157

Ac servo drive for network communication applications

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Chapter 3 Wiring

STO function description:

See the table below. Four logic conditions (Logic A, B, C, and D) are available to standardize the

FDBK status when different STO alarms occur. You can select the corresponding logic according

to the needs of the application. In this table, "Open" means FDBK+ and FDBK- of CN8 are an open

circuit. Take Logic C as an example. When AL500 occurs, FDBK+ and FDBK- of CN8 are short-

Servo drive status

Parameter P2-93

FDBK behavior

No STO alarm

Open = open circuit; Close = short circuit

Please refer to Chapter 10 Troubleshooting for more details.

FDBK behavior (Latch / No Latch):

If FDBK is latched when the STO alarm occurs, the status of FDBK does not change even when

the alarm is cleared. Please note that when more than one alarm occurs, the drive panel only

shows AL500.

Example of Latching:

If Logic C P2-93 = XX22 is set, the FDBK status is closed when safety signal is lost and AL005

Since FDBK is selected as Latch, even when the safety signal is back to normal, the FDBK

status remains closed. To reset FDBK:

(1) Reconnect the power supply: FDBK status returns to "open".

(2) Do not reconnect the power supply. Instead, set P2-93 to XX12 to make the FDBK status

return to "open". Then set P2-93 to XX22 again. This step sets the FDBK behavior to Latch.

After the FDBK status is restored, you can clear the alarms by the normal corrective actions.

In this case, you can clear AL500 by DI.Alm Reset.

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Troubleshooting