10.10.7 AI LOW PROTECTION
P3.9.8.1 ANALOGUE INPUT LOW PROTECTION (ID 767)
Use this parameter to select when the AI Low supervision is enabled.
For example, the AI Low supervision can be enabled only when the drive is in run state.
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, torque
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.
VACON · 284
PARAMETER DESCRIPTIONS
10
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