operate under “reduced op” is set in this display. The selec-
tion range is from 0 pumps to one pump less than the total
number of pumps on the BoosterpaQ. The default value is
0, resulting in all pumps stopping when a switch is closed
across PFU 2000 Terminals 14 and Y.
225 - Set-point Max.1
This display appears only if “reduced op.” is selected under
Input 4, Display 222. The value required for “set-point max.
1” is set in this display. The selection range is from STOP to
“set-point max.” set in Display 200.
226 - Stand-by Pumps
The number of stand-by pumps is set in this display. The
range is from 0 pumps to one pump less than the total num-
ber of pumps on the BoosterpaQ. The default value is 0.
Example:
One stand-by pump in a 3-pump system has been selected.
All three pumps will start/stop in full alternation depend-
ing on the performance required, but only two pumps can
run simultaneously. This provides even run time for all
pumps, but reserves one pump capacity.
227 - Pump Priority
The operating priority of the pumps is set in this display.
The priority is from 1 (highest priority) to 8 (lowest prior-
ity).
When used: If you have a three pump system and one
pump has a leaky seal or noisy motor bearing, you can set
that individual pump to priority 2. The controller will not
turn on this pump unless the other two pumps cannot keep
up with demand or one of them has faulted.
228 - Max. Limit (High system pressure)
This display sets the maximum discharge pressure limit as
measured by the discharge pressure sensor. If the pressure
sensor is located downstream, the BoosterpaQ can produce
the “max. limit,” plus the friction loss drop between the
discharge and the pressure sensor before it will trip. This
function is designed to help prevent damage due to over
pressure, such as pipe breakage or damage to end use
devices.
If “max. limit” is exceeded for more than 0.5 seconds, all
pumps are switched off and a fault indication is produced.
If the pressure drops below the “max. limit” for more than
five seconds, the pumps will be switched on automati-
cally. The fault reason will remain in the Fault Indication
Menu until cleared or erased if 10 faults occur after it is
recorded.
The range is from 0 to max. value of the discharge pressure
sensor range.
229 - Min. Limit (Low system pressure)
This display sets the minimum discharge pressure limit as
measured by the discharge pressure sensor. If the pressure
sensor is located downstream, the BoosterpaQ must pro-
duce the friction drop head, plus the “min. limit” to avoid
a trip.
PMU 2000 LCD display notes (continued)
220 - Suction Pressure Sensor Measuring Range, Input 2
(AI 2)
The suction pressure sensor signal output is recorded here.
If a suction pressure sensor is not installed, a pressure
switch or level switch is wired across different terminals
than the pressure sensor and PFU 2000 DIP Switch 1,
Contact 4 is set to “On.” A pressure sensor, set to pre-pres-
sure measurement is the factory default. The following
output signal selections are available:
• 0-10 V
• 0-20 mA
• 4-20 mA (default, installed at the factory)
221 - Input 3, External Set-point Influence Signal Input
(AI 3):
The external set-point influence signal type is recorded
here.
• 0-10 V
• 0-20 mA
• 4-20 mA (default, installed at the factory)
222 - Input 4, Activate/Deactivate External Digital Signal
When a switch is closed across Terminals 16 and “—” on
the PFU 2000 board, the Input 4 function selection is acti-
vated. The functions are:
[off] Closing the contacts causes no action. This is the fac-
tory default unless otherwise requested.
[remote] Remote control on/off. CLOSED contacts start
the system.
[reduced op] When PFU 2000 Input 4 contact is CLOSED,
the pumps which have NOT been set to reduced operation
will be switched off. The effective set-point will be “set-
point max. 1,” set in Display 225.
[fire fight] Note that “fire fight” does NOT imply that
BoosterpaQ systems are certified as a fire pump system,
as it is not. “Fire fight” is used to emphasize the necessity
of overriding the water shortage monitoring function per
operator discretion. When the PFU 2000 contact is CLOSED,
“set-point max. 1” will be activated. At least one pump is
started. Pre-pressure measuring is deactivated and this
function is not influenced by any external signal nor by the
clock program (multiple set-points, Display 201). The value
required for “set-point max. 1” is set in Display 225.
[flowswitch] When low flow occurs, the flow switch con-
tacts must open. As actual pressure exceeds the set-point,
the system will shut down.
223 - Minimum Speed
Available when service code is entered. Consult factory.
224 - Number of Pumps on Reduced Operation
This display appears only if “reduced op” is selected under
Input 4, Display 222. The number of pumps required to
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