Vacon 100 flow, Руководство по применению, Страница: 317 / 386

P3.13.9.7 SUPERVISION ALARM LEVEL (ID 1691)
Use this parameter to set the limit for the input pressure alarm.
If the measured input pressure goes below this limit, an input pressure alarm occurs.
P3.13.9.8 SUPERVISION FAULT LEVEL (ID 1692)
Use this parameter to set the limit for the input pressure fault.
If the measured input pressure stays below this level for longer than the set time, an input
pressure fault occurs.
P3.13.9.9 SUPERVISION FAULT DELAY (ID 1693)
Use this parameter to set the maximum duration for the input pressure to stay below the
fault limit before an input pressure fault occurs.
P3.13.9.10 PID SETPOINT REDUCTION (ID 1694)
Use this parameter to set the rate of the reduction of the PID setpoint value when the
measured input pressure is below the alarm limit.
10.14.10 SLEEP FUNCTION WHEN NO DEMAND IS DETECTED
This function makes sure that the pump does not operate at a high speed when there is no
demand in the system.
The function becomes active when the PID feedback signal and the output frequency of the
drive stay in the specified hysteresis areas for longer than set with parameter P3.13.10.4
SNDD Supervision Time.
There are different hysteresis settings for the PID feedback signal and the output frequency.
The hysteresis for the PID feedback (SNDD Error Hysteresis P3.13.10.2) is given in the
selected process units around the PID setpoint value.
When the function is active, a short-time bias value (SNDD Actual Add) is added internally to
the feedback value.
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If there is no demand in the system, the PID output and the output frequency of the drive
decrease to the direction of 0. If the PID feedback value stays in the hysteresis area, the
drive goes to the Sleep mode.
•
If the PID feedback value does not stay in the hysteresis area, the function is deactivated
and the drive continues to operate.
PARAMETER DESCRIPTIONS VACON · 317
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