Operation Of The Control Device; Controls (Fig. 1) - Wilo -VR-System Installation And Operating Instructions Manual

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Pump kick
If the system is switched off for 6 hours due to a
zero-flow cut-off, one pump of the unit is switched
on for approx. 10 seconds. Pump cycling is per-
formed in the repeated case, meaning that e.g. for
a 4-pump system, every pump set to "Auto" starts
once every 24 hours.
The pump kick is for avoiding any blocking of
a pump after a long standstill.
Standby pump
Setting the system parameters via DIP switches
allows a pump to be defined as standby pump.
During standby operation, operation of the pump
is disabled. It is only switched on if a pump fails
due to a fault and a corresponding demand exists.
Pump cycling ensures that every pump becomes
a standby pump.
Fault-actuated switchover of multi-pump system
If a pump indicates a fault, it is switched off imme-
diately. This is done by reducing the analogue con-
trol voltage to 0 V.
If a pump fails, the control task is assigned to a
pump previously not in operation. If a pump run-
ning at maximum speed fails, the control increases
the pump output of the control pump according to
requirements and, if necessary, a further pump is
started.
Low water
A low-water signal can be fed to the control system
via a potential-free contact by means of a signal
from a suction-side pressure switch, float switch
or level relay. The pumps are switched off after an
adjustable time T1. Low water below the time T1
does not result in the system being deactivated.
The system is restarted immediately if there is no
low-water signal.
Low water activates the collective fault signal
once T1 has passed and the low water LED lights
up immediately. If the low water is corrected before
the time T1 passes, the LED goes out. If T1 is
exceeded, the LED stays on until acknowledge-
ment is given. The LED flashes during the time
between the correction of the low water and the
acknowledgement.
Turning the rotary knob acknowledges the error
message and the collective fault signal is reset.
Acknowledgement is only possible if the fault no
longer applies.
20
Overpressure
An overpressure threshold can be set to protect
the building installation. If the system pressure
rises above this threshold for a period of three
seconds, the pumps in operation are switched off
without delay and the collective fault signal and
the overpressure LED are activated.
If the system pressure has fallen back below the
overpressure threshold, the fault is indicated by
the flashing overpressure LED. The system is
restarted one second after the system pressure
has fallen below this pressure threshold. After
acknowledging the fault, the overpressure LED
and the collective fault signal are reset.
Emergency operation
In the event of a fault of the microcontroller board
or of the sensor, the operator has the option of
specifying a fixed, analogue voltage (0 ... 10 V) and
thus a fixed speed for the pumps (see Section 8.4).
The voltage can be specified via a potentiometer.
The slide switch can be used to start or stop the
pumps according to requirements.
CAUTION! Risk of damage to property!
During emergency operation, all control and
monitoring functions are disabled. However,
electrical line and motor protection are still
ensured.
It is essential that the system is monitored by
a specialist.

4.2 Operation of the control device

4.2.1 Controls (Fig. 1)

• Main switch (item 1)
On/Off function of the control system and discon-
nection from the electrical power supply
• LC display (item 3)
The setting parameters and system messages are
indicated on the display by symbols and numerical
values.
The display's illumination is switched on perma-
nently.
• Rotary knob (item 2)
The rotary knob is used for the user-specific input
of values or for acknowledging faults.
Briefly pressing the knob takes you from the stand-
ard display to the Operating modes menu (see
4.2.2 Menu structure) of the pumps. Pressing it for
more than 2 seconds opens the System settings
menu (see 4.2.2 Menu structure).
The parameters or settings on the display can be
changed accordingly in the individual menu items
by turning the rotary knob to the left or right and
then pressing the button.
WILO SE 07/2011