Table 27: Fault types of the Advanced safety option board
Fault type
of the op-
tion board
Response of the option
board
Internal broken hardware, incorrect
configuration, temporary malfunc-
tion detected by the diagnostics.
Attempt to fix the issue. Reboot
of the AC drive.
The STO function becomes
active, all outputs are inac-
tive.
External broken hardware, incorrect
configuration, temporary malfunc-
tion detected by the diagnostics.
Attempt to fix the issue. Cleared
with the reset signal. See 6.1.6
Reset of a Safety Function.
The STO+SBC function be-
comes active, see 6.2.2.3
The STO Function Used
with the SBC Function.
Violation of a monitoring limit in an
active safety function.
Cleared with the reset signal. See
chapters 6.1.4 Violation of a Safe-
ty Function and 6.1.6 Reset of a
Safety Function.
Safe monitoring functions:
the SQS function.
Safe stopping functions:
the STO+SBC function.
An event that does not affect the
operation, but is shown for infor-
mation.
Does not require clearing. /
Cleared with the reset signal.
Failures that are detected by the internal diagnostics of the option board trigger a fault. The faults can be resettable or critical.
Resettable faults are informed to the control board of the AC drive and reported on the fault log of the AC drive. They can be cleared
by a reset signal. See 6.1.6 Reset of a Safety Function.
Critical faults of the option board cause the option board to deactivate its outputs and communication to other systems. This means
that both the channels of the two-channel outputs are in the deactivated state. The safe fieldbus communication is also stopped. To
other systems, the situation looks as if the option board is not turned on or the cabling is faulty. Take this into account when design-
ing and implementing other systems.
If the fault that causes the critical fault does not have an effect on the communication between the option board and the control
board of the AC drive, this communication stays active. The fault data can be read from the fault log of the AC drive. If the fault is
related to the communication or otherwise prevents the option board from communicating with the control board, the communi-
cation stops. In this case, the fault data cannot be read from the fault log.
N O T I C E
If the option board starts after a reboot of the AC drive, it may be possible to read the fault data in the activity log of the Ad-
vanced safety option board. See 5.6.2 Activity Log.
AQ319736045637en-000101 / DPD0179850 | Danfoss A/S © 2021.06
Overview of the System
VACON® NXP Advanced Safety Options
Operating Guide
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