Grundfos SMART Digital DDA, Инструкция по установке и эксплуатации

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6.8 Pressure monitoring
FC/FCM control variant.
A pressure sensor monitors the pressure in the
dosing head. If the pressure during the discharge
phase falls below 2 bar, a warning is generated
(pump continues running). If in the
’Setup > Pressure
monitoring’ menu the function ’Min. pressure alarm’
is activated, an alarm is generated and the pump is
stopped.
If the pressure exceeds the cut-off pressure set in
the
’Setup > Pressure monitoring’ menu, the pump is
shut down, enters the standby state and indicates an
alarm.
6.8.1 Pressure setting ranges
6.8.2 Calibration of pressure sensor
The pressure sensor is calibrated in the factory. As a
rule, it does not need to be re-calibrated. If specific
circumstances (e. g. pressure sensor exchange,
extreme air pressure values at the location of the
pump) necessitate a calibration, the sensor can be
calibrated as follows:
1. Set pump to ’Stop’ operational state.
2. Make system pressureless and flush.
3. Dismantle suction line and suction valve.
4. Proceed as described below to calibrate:
If a calibration is not successfully possible, check
plug connections, cable and sensor and replace
defective parts where necessary.
Caution
The pump restarts automatically once
the backpressure falls below the cut-off
pressure!
Type
Fixed min.
pressure (bar)
Settable max.
pressure [bar]
DDA 7.5 - 16 < 2 3 ... 17
DDA 12-10 < 2 3 ... 11
DDA 17-7 < 2 3 ... 8
DDA 30-4 < 2 3 ... 5
Caution
The pressure measured in the dosing
head is slightly higher than the actual
system pressure.
Therefore the cut-off pressure should
be set min. 0.5 bar higher than the
system pressure.
Warning
Install a pressure-relief valve in the
pressure line to provide protection
against impermissibly high pressure!
Caution
Calibrating when the suction valve is
installed produces incorrect calibration
and can cause personal injuries and
damage to property!
Only carry out a calibration if this is
technically required!
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Plug in pressure sensor plug or select
’Setup > FlowControl active’ menu
Prompt:
’Activate FlowContr.?’
FlowControl not
activated
FlowControl active,
Sensor not calibrated.
Prompt:
’Sensor calibration?’
Prompt:
’Suction valve removed?’
Sensor not calibrated.
OK
Calibration error
Message:
’Sensor calib. OK
Current pressure: X bar’
Message:
’Sensor calib. failed!
’Repeat?’
Sensor not calibrated.