35 / 76
operated on frequency inverters (parameter 2-4-1-4). The Options are
Stop all pumps
,
Freeze number of pumps running and speed
or
Run a specific number of pump sets at fixed
speed
(parameter 2-4-1-6).
8.6.3 Discharge pressure monitoring
Discharge pressure
monitoring
The current discharge pressure is monitored continuously. When the pressure falls below
the configured Maximum Discharge Pressure (parameter 2-5-5-1-1) or exceeds the
configured Minimum Discharge Pressure (parameter 2-5-5-2-1), a message is output after a
Delay Time (parameter 2-5-5-1-2 resp. parameter 2-5-5-2-2) or the pump sets are stopped
in addition, depending on the configured Selection of Pump Response (parameter 2-5-5-1-1
resp. parameter 2-5-5-2-3).
8.6.4 Short pressure deviations
Short pressure
deviations
Short deviations of the discharge-side pressure from the setpoint that meet the criterion of
starting up and stopping pumps can be prevented from starting up and stopping pumps by a
Delay Time for Pump Start (parameter 2-4-5-2) and a Delay Time for Pump Stop (parameter
2-4-5-3). In this case, pumps will only be started up or stopped if the pressure deviations
continue after the delay times.
8.6.5 Leakage detection
Leakage detection
If leakage detection is to be used, Leakage Detection has to be set to Enabled (parameter
2-5-2-1). As a detection signal Source
Water detection integrated
or
Leakage detection by
external device
(parameter 2-5-2-2) can be selected.
For signalling by an external device, Leakage detection by external device has to be
assigned a digital input (one of parameters 1-3-3-1 to 1-3-3-18). Leakage detection can
monitor the Leakage of pump system or Overflow of tank, which can be selected via the
Position (parameter 2-5-2-4). The Response to any leakage being detected can be
configured (parameter 2-5-2-5). In the event of leakage at the pump system options are
either Message only or Message and stop all pumps. In the event of a tank overflow, the
options available are Message only, Message and close inlet valve, and Message, close
inlet valve and stop pumps, referring to the rainwater pumps. Settings can also be made for
the Delay Time Leakage Detection (parameter 2-5-2-6) and for the Delay Time Reset
(parameter 2-5-2-7).
8.6.6 Pipe filling function
Pipe filling function
The Pipe Filling Function can be Enabled (parameter 2-5-6-1) and will then check prior to
every start-up of the first pump set of the pressure booster system whether the deviation of
the current discharge pressure from the setpoint is higher than the value programmed as
Deviation from Setpoint (parameter 2-5-6-2). The function will then start with the current
discharge pressure as the new current setpoint and increases the setpoint by the Ramp
Step for Increasing Setpoint (parameter 2-5-6-3) every time the ramp step is reached within
the Maximum Time for Ramp Step (parameter 2-5-6-4). If the ramp step could not be
reached after the Maximum Number of Attempts (parameter 2-5-6-5), the function is
cancelled and a message is output. If the configured setpoint is reached, the function ends.
8.6.7 Membrane rupture detection
Membrane rupture
detection
Membrane Rupture Detection can be activated for accumulators (parameter 1-1-8-1). Two
different Sources can be used to trigger the detection (parameter 1-1-8-3). For signalling by
an external device, Membrane Rupture Detection has to be assigned a digital input (one of
parameters 1-3-3-1 to 1-3-3-18). A delay can be set for the corresponding message (Delay
Time Membrane Rupture Detection) and resetting of that message (Delay Time Reset)
(parameters 1-1-8-4 and 1-1-8-5).
