Wilo W-CTRL-CC Série Notice De Montage Et De Mise En Service page 49

The cyclical pump exchange performs an
exchange of the base-load pump after the expiry
of the set time. The operating hours remain
unconsidered during this.
By selecting the impulse exchange mechanism,
the base-load pump is exchanged at every
request (after a stop of all pumps). The operating
hours remain unconsidered here as well.
One pump can be permanently defined as the
base-load pump via the pump pre-selection item.
Independently of the exchange mechanism of the
base-load pump, the peak-load pumps are
exchanged in a way that is service-life optimised.
This means that the pump with the lowest ser-
vice-life is always switched on first at a pump
request, and switched off last when there is a
reduction.
Standby pump
A pump can be defined as standby pump in menu
4.3.4.1. The activation of this operating mode
leads to a pump not being activated in normal
operation. It is only switched on if a pump fails due
to a fault. However, the standby pump is subject
to standstill monitoring and is included in the test
run. Service life optimisation ensures that every
pump becomes a standby pump once.
Pump test run
To avoid longer standstill times, a cyclic test run of
the pumps is provided. For this, the time between
2 test runs and the duration of the test run can be
specified in menu 4.3.4.3.
The test run is deactivated by setting the test run
interval to 0 hours.
A test run only happens when the system is in
standstill (after zero-flow cut-off).
A selection button can be used to choose whether
the test run should also happen if the switchgear
is in "external off" status.
The pump speed for the test run can be set in the
CCe version.
Fault-actuated switchover of multi-pump system
Switchgear with frequency converter –
CC-FC version:
If the base-load pump has a fault, it is switched off
and another pump is switched onto the frequency
converter. A fault of the frequency converter
switches the switchgear into the "auto without
frequency converter" operating mode with the
associated control characteristics.
Installation and operating instructions Wilo-Control CC-Booster
Switchgear without frequency converter –
CC version:
If the base-load pump develops a fault, it is
switched off and one of the peak-load pumps is
managed by the control system as a base-load
pump.
Switchgear in the CCe version:
If the base-load pump develops a fault, it is
switched off and another pump takes over the
control function.
A fault of the peak-load pump always leads to its
switching off and to the switching on of a further
zero-load pump (if necessary, also the reserve
pump).
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 pre-pressure monitor, suction-side
pressure switch or optional level relay. The pumps
are switched off after the expiry of the delay time
set at menu 3.1. If the signal input is closed again
within the delay time, this does not lead to deac-
tivation.
After deactivation due to low water, the system
restarts automatically 10s after the signal input
closes (in suction mode without delay).
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 4.3.2.2.
Exceeding the maximum pressure leads to the
immediate switching off of all pumps. After the
pressure sinks to the switching on level, normal
operation is cleared again after 1 minute. The SSM
is activated if, within 24 hours, 3 deactivations
occur because of over-pressure.
Exceeding the minimum pressure immediately
leads to the activation of the SSM. A deactivation
of the pumps does not occur (pipe burst detec-
tion).
For monitoring maximum and minimum pressure,
a hysteresis can be entered in the above-men-
tioned menu for the duration until triggering of
the fault processing. This should also create the
possibility of hiding pressure peaks or troughs.
External Off
It is possible to deactivate the control device
externally using a normally closed contact. This
function has precedence; all pumps are deacti-
vated.
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