Use the AI Low Protection to find failures in the analogue input signals. This function gives
protection only to the analogue inputs that are used as frequency reference or in the PID/
ExtPID controllers.
You can have the protection on when the drive is in the RUN status, or in the RUN and STOP
statuses.
Selection
number
Selection name Description
1 Protection disabled
2
Protection enabled in RUN sta-
tus
The protection is enabled only when the drive is in the RUN
status.
3
Protection enabled in RUN and
STOP status
The protection is enabled in the 2 statuses, RUN and STOP.
P3.9.8.2 ANALOGUE INPUT LOW FAULT (ID 700)
Use this parameter to select the response of the drive to an 'AI Low' fault.
If the analogue input signal becomes less than 50% of the minimum signal for 500ms, an AI
Low fault occurs.
If AI Low Protection is enabled with parameter P3.9.8.1, this parameter gives a response for
the fault code 50 (Fault ID 1050).
The AI low protection function monitors the signal level of the analogue inputs 1-6. If the
analogue input signal becomes less than 50% of the minimum signal for 500 ms, an AI Low
fault or alarm shows.
NOTE!
You can use the value Alarm + Previous Freq only when you use analogue input 1 or
analogue input 2 as frequency reference.
Selection
number
Selection name Description
0 No Action AI Low Protection is not used.
1 Alarm
2 Alarm, preset frequency
The frequency reference is set as in P3.9.1.13 Preset Alarm
Frequency.
3 Alarm, previous frequency The last valid frequency is kept as frequency reference.
4 Fault The drive stops as is set in P3.2.5 Stop Mode.
5 Fault, coasting The drive stops by coasting.
PARAMETER DESCRIPTIONS VACON · 295
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