NOTICE
At any possible failure or warning indicated from the safety option, the LCP shows warning, !Safe Option Failure [W252] at the
least.
8.2.2 Safety Option Reset Message
For some messages, the safety option requires an acknowledgement of an ongoing action or failure on the safety option. The safety
option uses Safe Option RESET as a Restart and Failure Acknowledgement.
Table 33: LCP Reset Messages
LCP message Description
SO Reset required!
!1(1)
0 R PM None 0.00 KW
In the following cases, the safety option requests a restart and failure acknowledgement signal:
• The safety option is in safety function pending-state (remark: Occurs only if reset behavior is
set/configured to Manual).
• After a power cycle with a safety function.
• In PUST (power up self-test), if an external failure occurred before power cycle.
• When an external failure occurred.
• When customization was aborted or completed.
• At the reception of a general reset (required after blank initial state or in the customization
state).
SO in Self-test
!1(1)
0 R PM None 0.00 KW
The safety option indicates that it is PUST State (Power Up Self Test).
• Ensure that no safe function is active after a power cycle.
SO in Self-test
!1(1)
0 R PM None 0.00 KW
A safety function is pending at the start-up, if the drive was powered down while a safety func-
tion was active. It is also pending, when the drive was powered down while the safety option has
detected a failure during an active safety function.
SafeOpt. initialised
!1(1)
0 R PM None 0.00 KW
The safety option requests a Restart and Failure Acknowledge signal, which is always required af-
ter a PUST and when a safety function gets released and is configured to be confirmed that the
motor is able to run.
Warnings and Alarms
Installation Guide | VLT® Safety Option MCB 150/151
AQ279747441421en-000101 / 130R0292
90 | Danfoss A/S © 2018.09
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