Wilo SC-Booster SC Notice De Montage Et De Mise En Service page 51

English
Low water
A low-water signal can be fed to the control sys-
tem via a normally closed contact by means of the
signal from a suction-side pressure switch or pre-
liminary tank float switch. The pumps are
switched off after a delay time that can be set in
menu 1.2.5.4 has expired. If the signal input is
closed again within the delay time, this does not
lead to deactivation.
The system restart after a deactivation due to low
water is performed automatically after the signal
input closes (delay time acc. to menu 1.2.5.5).
The fault signal is reset automatically after the
restart, but can be read out from the history mem-
ory.
Monitoring of maximum and minimum pressure
The limit values for safe system operation can be
set in menu 5.4.0.0.
Exceeding the maximum pressure (menu 5.4.1.0)
leads to delayed (menu 5.4.4.0) deactivation of all
pumps. The collective fault signal is activated.
Normal mode is enabled again after the pressure
has dropped below the activation threshold.
In menu 5.4.2.0, it is possible to set the pressure
threshold of the minimum pressure monitoring,
and in menu 5.4.5.0, the delay time. The behaviour
of the switchgear when this pressure threshold is
undershot can be selected in menu 5.4.3.0 (deac-
tivation of all pumps or continued operation). The
collective fault signal is activated in all cases.
External off
It is possible to deactivate the control device
externally using a normally closed contact. This
function takes priority; all pumps running in auto-
matic mode are switched off.
Operation in the event of a sensor fault
In the event of a sensor fault (e.g. wire break), the
behaviour of the switchgear can be defined in
menu 5.2.3.0. The system is either switched off or
continues to run with a pump. In the SCe and SC-
FC versions, the speed of this pump can be set in
menu 5.2.4.0.
"Slow" mode
SCe 1 pump runs at a speed acc. to menu 5.8.4.0
SC-FC 1 pump runs at a speed acc. to menu 5.8.4.0
SC 1 pump runs at fixed speed
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Operating mode of the pumps
The operating mode of the pumps can be selected
in menus 3.2.1.1, 3.2.2.1, 3.2.3.1 and 3.2.4.1
(manual, off, auto). In the SCe version, the speed
can be set in "manual" operating mode (menus
3.2.1.2, 3.2.2.2, 3.2.3.2 and 3.2.4.2).
Setpoint changeover
The control system can work with 2 different set-
points. They are set in menus 1.2.1.1 and 1.2.1.2.
Setpoint 1 is the reference setpoint. A changeover
to setpoint 2 is performed by closing the external
digital input (acc. to wiring diagram).
Remote setpoint adjustment
Remote adjustment of the setpoint is possible
using an analogue current signal (4-20 mA) by
means of the corresponding terminals (acc. to
wiring diagram). This function can be activated
in menu 5.3.1.0.
The input signal is always referred to the sensor
measuring range (e.g. 16 bar sensor: 20 mA corre-
sponds to 16 bar).
Logic reversal of the collective fault signal (SSM)
The required logic of the SSM can be set in menu
5.5.2.0. In this case, it is possible to select
between negative logic (falling edge in case of a
fault = "fall") or positive logic (rising edge in case
of a fault = "rise").
Function of the collective run signal (SBM)
The required function of the SBM can be set in
menu 5.5.1.0. In this case, it is possible to select
between "Ready" (switchgear is ready for opera-
tion) and "Run" (at least one pump is running).
Pipe fill
The pipe fill function can be activated (menu
5.8.1.0) in order to avoid pressure peaks when fill-
ing empty pipes or pipes under low pressure, or in
order to fill pipes as quickly as possible. In this
case, it is possible to differentiate between "slow"
and "fast" modes (menu 5.8.2.0).
If the pipe fill function is activated, operation
takes place according to the table below following
a system restart (activation of mains voltage;
external on; drives on) for a time that can be set in
menu 5.8.3.0:
"Fast" mode
All pumps run at a speed acc. to menu 5.8.4.0
Base-load pump runs at a speed acc. to menu 5.8.4.0
All peak-load pumps run at fixed speed
All pumps run at fixed speed
WILO SE 01/2013