Wilo Control EC-Fire Einbau- Und Betriebsanleitung Seite 54

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Mode 3
If the system pressure falls below the start-up
pressure (menu 1.04) a connected pump is imme-
diately activated (1).
If the volume flow requirement in the system falls,
the pressure increases again, and when the deac-
tivation threshold (3) (menu 1.05) is exceeded,
the pump is deactivated (5) after an adjustable
follow-up time (menu 1.06).
In Mode 3a, pump deactivation occurs via a flow
switch (see Mode 1).
In Mode 3b, pump deactivation occurs via volume
flow sensor (see Mode 2).
Mode 4
If the system pressure falls below the start-up
pressure (setting on the pressure switch), the
pressure switch contact is closed and the switch-
gear activates a connected pump immediately (1).
If the volume flow requirement in the system falls,
the pressure increases again; the pressure switch
contact opens when the deactivation
threshold (3) is exceeded and, after an adjustable
follow-up time (menu 1.06), the pump is
deactivated (5).
Pump operating mode
The operating mode of the pumps (Hand, Off,
Auto) can be selected in menus 3.02 to 3.04. In
manual mode, the pump operates as long as the
operating button is held down.
Standby pump
In devices with more than one pump, a pump is
defined as the standby pump and is not actuated
in normal operation. This pump only becomes
active when a pump fails due to a fault.
The standby pump is, however, subject to stand-
still monitoring and is activated during pump
cycling and pump kick.
This function is preset at the factory and cannot
be changed.
Pump cycling
To prevent irregular running times of the individ-
ual pumps, general pump cycling takes place. This
means that pumps are changed at the next start
only after all pumps have been switched off.
Pump kick
To prevent longer standstill times for the con-
nected pumps, a periodical test run can be per-
formed (pump kick function) (menu 5.40 to "on").
A test run is only performed when all of the pumps
have been brought to a standstill.
If pump kick is activated, the following parameters
must also be set:
• Menu 5.41: definition of whether pump kick
should also take place if pumps are switched off
via "Ext. Off"
44
• Menu 5.42: time interval after which a pump kick
should take place
• Menu 5.43: running time of the pump kick
Dry-running protection
A low water signal can be fed to the switchgear via
a normally closed contact by means of the signal
from a suction-side pressure switch or break tank
float switch.
If the contact is open, the pumps are switched off
after the adjustable delay time set in menu 5.62
has elapsed. If the signal input is closed again
within the delay time, this does not lead to deac-
tivation.
The system restart after a deactivation due to low
water takes place automatically after the signal
input closes (delay time acc. to menu 5.63).
The fault message is reset automatically after the
restart, but can be read out from the history
memory.
Ext. Off
It is possible to deactivate the switchgear exter-
nally using an NC contact. This function takes
precedence; all pumps are switched off.
Behaviour during sensor fault (pressure sensor
or volume flow sensor)
In the event that a sensor fault occurs (e.g. wire
break) in the system, menu 5.45 can be used to
define whether and with how many pumps the
system (uncontrolled) continues to run. This
means that the water supply can be maintained in
the event of a such a fault.
Plausibility monitoring
If the system pressure falls and a pump starts, a
volume flow should build up in the system. A cor-
responding signal must be sent by the flow
switch/flow sensor within 10 s; otherwise, a plau-
sibility alarm (E090) is triggered.
Plausibility is not monitored during a pump kick.
Logic of the collective run signal (SBM)
The desired function of the collective run signal
can be set in menu 5.58:
• "On": switchgear ready for operation
• "Run": at least one pump is running
Logic of the collective fault signal (SSM)
The desired logic of the collective fault signal can
be set in menu 5.59:
• "Fall": negative logic (falling edge)
• "Raise": positive logic (rising edge)
Integrated alarm buzzer
Depending on the application of the switchgear,
the internal alarm buzzer parameters can be set as
follows (menu 5.66):
• "off": deactivated – no warning function
• "Error": the alarm buzzer sounds when a fault
occurs in the system
• "Run": the alarm buzzer sounds if at least one
pump is running
WILO SE 06/2018