English (GB)
54
8.7.53 Pumps outside duty range (4.4.7)
Fig. 103
Pumps outside duty range
Description
The function gives a warning if the duty point of the pumps moves
outside the defined range. For instance, if the inlet pressure
becomes lower than a minimum permissible value, thus causing a
risk of cavitation for some pump types.
The warning is given with a set time delay. It is possible to set
whether the warning is to be reset automatically or manually
when the duty point comes within the defined duty range. You can
also set a relay output to be activated when the warning is given,
and to be deactivated when the warning is reset.
This function requires that the discharge pressure and the inlet
pressure (either measured or configured) or the differential
pressure of the pumps is monitored, and that CU 352 contains
valid pump data from either a GSC file or from manual input.
See section
8.7.39 Pump curve data (4.3.19)
.
Setting range
• Setting of manual or automatic resetting.
• Setting of warning delay.
Setting via control panel
• Settings > Monitoring functions > Pumps outside duty range >
Manual / Auto > Set warning delay.
Factory setting
The function is disabled.
8.7.54 Pressure relief (4.4.8)
Fig. 104
Pressure relief
Description
The purpose of the function is to reduce the pressure in the
pipework by opening a solenoid valve if it exceeds a set limit.
If the pressure is not reduced within a given time, the solenoid
valve will be closed, and a warning can be given.
Fig. 105
Pressure relief
Setting range
• Setting of digital output.
• Setting of pressure to be monitored.
• Setting of valve opening pressure.
• Setting of band for valve opening pressure.
• Setting of warning or alarm.
Setting via control panel
• Settings > Monitoring functions > Pressure relief > Go to
setting of digital output.
1. Select digital output.
2. Select: Pressure relief.
3.
x 2.
4. Select:
• Pressure to be monitored
• Discharge pressure, System pressure / External pressure.
5.
.
6. Select and set:
• Valve opening pressure
• Band, valve opening pressure.
7. Select: Warning> Disabled
/ Enabled.
8. Set: Delay.
(Only to be set if warning has been enabled.)
9. Select: Enabled.
Factory setting
The function is disabled.
TM
03 920
6 360
7
4
Band
Warning
delay
Valve opening
pressure
Valve opening pressure
minus band
P [bar]
Time [sec]
1: Solenoid valve opens.
2: Solenoid valve closes.
3: Solenoid valve opens.
4: Warning is activated.
5: Solenoid valve closes,
and warning is reset.
5
3
2
1
