Actual signals and parameters 251
44 PUMP
PROTECTION
Set-up of pump protection.
4401 INLET PROT
CTRL
Enables, and selects the mode of, the primary supervision
of pump/fan inlet pressure.
Note: Inlet protection is active only when the active
reference is PID.
NOT SEL
NOT SEL Primary inlet pressure supervision not used 0
ALARM Detection of low inlet pressure generates an alarm on the
control panel display.
1
PROTECT Detection of low inlet pressure generates an alarm on the
control panel display. The output of the PI controller is
ramped down (according to parameter 4417 PID OUT DEC
TIME) to the forced reference (set by parameter 4408
INLET FORCED REF). The drive reverts to the original
reference if the pressure subsequently exceeds the
supervision level.
The following diagram describes the inlet pressure
supervision function.
2
FAULT Detection of low inlet pressure trips the drive on a fault. 3
4402 AI MEASURE
INLET
Selects the analog input for pump/fan inlet pressure
supervision.
NOT SEL
NOT SEL No analog input selected 0
AI1 Pump/fan inlet pressure monitored through analog input AI1 1
AI2 See selection AI1.2
4403 AI IN LOW
LEVEL
Sets the supervision limit for the primary inlet pressure
measurement. If the value of the selected input falls below
this limit, the action defined by parameter 4401 INLET
PROT CTRL is taken after the delay set by parameter 4407
INLET CTRL DLY expires.
0.00%
0.00…100.00% The range corresponds to 0…10 V or 0…20 mA on the
analog input. With a bipolar input, the absolute input value is
considered.
1 = 0.01%
4404 VERY LOW
CTRL
Enables, and selects the mode of, the secondary inlet
pressure supervision function. The function uses the analog
input selected by parameter 4402 AI MEASURE INLET.
NOT SEL
NOT SEL Secondary inlet pressure supervision not used 0
All parameters
No. Name/Value Description Def/FbEq
Measured inlet
pressure
EXT2 reference
(from PID1OUT)
4403
4405
4407
4408
t
t
4417
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