18
•
“reduced op” (reduced operation)
When the PFU 2000 input 4 contact is closed, the pumps
which have not been set to reduced operation will be switched
off, i.e. the system performance is reduced to the number of
pumps set to reduced operation.
Examples of application: Reduced power supply with an emer-
gency power set. Reduced permissible water consumption in
case of limited source capacity.
For further information, see section
3.1.12 Reduced operation.
•
“setpoint max1”
When the PFU 2000 input 4 contact is closed, “setpoint max1”
will be activated.
•
“fire fight”
This function is only available with control parameters
“pressure” and “pressure with pre-pressure measuring”.
When the PFU 2000 input 4 contact is opened, “setpoint
max1” will be activated. At least one pump is started. The
water shortage monitoring function is suppressed.
•
“flowswitch”
This function is only available with control parameters
“pressure” and “pressure with pre-pressure measuring”.
The pumps will be stopped when the PFU 2000 input 4 contact
is opened and the actual pressure is higher than the setpoint
set.
Operation with PFU 2000 EPROM settings:
The default setting is “remote on/off”.
3.2.16 Ramp time
Operation with PFU 2000 RAM / PMU 2000 settings:
The ramp time is the time needed to change the setpoint factor
from 0 to 1 and vice versa.
If the PFU 2000 input 4 has been set to “ramp 2 pt” or
“ramp 3 pt” (display 222), the ramp time must be set (display
223).
The setting range is 1 to 99 minutes.
The default setting is 10 minutes.
Fig. 21
Setp. act.
Ramp time
Time
Max
Ramp time
TM
00
50
06
48
94
3.2.15 PFU 2000 input 4 configuration
The PFU 2000 digital input 4 can be used for external control of
the zone. Only one function per zone can be selected.
Operation with PFU 2000 RAM / PMU 2000 settings:
The default setting is “off”.
The following functions are possible (display 222):
•
“off”
Input 4 has no function.
•
“remote on/off”
When the PFU 2000 input 4 contact is opened, all pumps are
switched off.
•
“ramp 2 pt” (two-point control of setpoint)
When the PFU 2000 input 4 contact is closed, the setpoint will
drop linearly in accordance with the set “ramp time” (display
223).
When the contact is opened, the setpoint will rise linearly in
accordance with the set “ramp time” (display 223).
The default setting is “setpoint act.”.
Fig. 19
•
“ramp 3 pt” (three-point control of setpoint)
The PFU 2000 input 2 is used for this function together with in-
put 4. The function “ramp 3 pt” is not possible with control pa-
rameters using the PFU 2000 input 2.
When the PFU 2000 input 4 contact is closed, the setpoint will
drop linearly in accordance with the set “ramp time” (display
223).
When the PFU 2000 input 2 contact is closed, the setpoint will
rise linearly in accordance with the set “ramp time” (display
223).
When the PFU 2000 input 2 and PFU 2000 input 4 contacts
are opened, the setpoint will be kept constant.
When both contacts are closed, the setpoint will drop linearly
by a factor of 1 to 0 in accordance with the set “ramp time”.
The default setting is “setpoint act.”.
Fig. 20
Setp. act.
Ramp time
Time
100%
Two-point control of setpoint
TM
00
50
04
48
94
Setp. act.
Ramp time
Time
100%
Three-point control of setpoint
TM00
50
05
48
9
4
