Power Supply Connection; Pump Connection; Pressure Switch/Limit Switch Connection; Low Water Connection - Wilo Control-FLA Notice De Montage Et De Mise En Service

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7.2.1 Power supply connection

The onsite cable for the supplying network shall
be connected to the terminal strip in accordance
with the circuit diagram. The electrical connec-
tions for fire extinguishing systems must be
implemented in separate electric circuits in the
main distribution board, in accordance with DIN
14462.
In the case of redundant double-pump systems,
each part of the system must have a separate
cable for the mains supply, in accordance with DIN
14462. Select the cable cross-section according
to the maximum back-up fuse (see circuit dia-
gram).

7.2.2 Pump connection

The pump is connected to the terminal strips as
per the circuit diagram. The pumps are operated
up to 4kW in direct starting and from 5.5kW in
star-delta starting.
According to DIN 14462, the pump cable may only
be laid in a single length and only one consumer
may be connected to it.

7.2.3 Pressure switch/limit switch connection

The pressure switch is connected to the WM1
resistance circuit (see circuit diagram). The WM1
resistance circuit is used to implement the wire
break and short-circuit monitoring.
If limit switch loops are used instead of pressure
switches for the fire hose reels, the loops have to
be fitted with resistors (see example in circuit dia-
gram).

7.2.4 Low water connection

Either float switches or level control electrodes
can be connected to the terminal strip for protec-
tion against low water level (dry-running protec-
tion) (see circuit diagram) in order to monitor the
water level in the run-down tank.

7.2.5 "Pump on (not in test run)" connection

A signal can be taken from the terminal strip for
"pump on (not in test run)" via a potential-free
changeover contact in order to signal that the
pump is operating (see circuit diagram). This signal
is not active in test run mode and is used for the
drinking water separation option.
7.2.6 "Operational standby and collective fault"
connection
A potential-free NO contact is available on the
terminal strip for the system standby signal and a
potential-free changeover contact is available on
the terminals for the collective fault signal. These
two signals are switched in series by a converter
bridge. This enables a shared collective fault to a
single control technology (see circuit diagram).
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7.2.7 "Pump on" connection

There is a potential-free NO contact on the termi-
nal strip for the "pump on" standby signal. Unlike
the "pump on (not in test run)" signal, this signal is
also active in test run mode.

7.2.8 Mains voltage supply monitoring connection

There is a potential-free NO contact on the termi-
nal strip for monitoring the supply network. If the
FLA switchgear is switched on and the supply net-
work is free of faults, the contact is closed. If an
error occurs, e.g. phase failure, incorrect phase
sequence, overvoltage or undervoltage, the con-
tact opens.

7.2.9 Emergency spillway monitoring connection

A float switch can be connected to the terminal
strip for monitoring the emergency spillway of the
run-down tank. This signal does not interfere in
the FLA switchgear's control and is not displayed
as a fault on the FLA switchgear. It is available on
the terminal strip as a potential-free contact for
the building management system.

8 Commissioning

WARNING! Risk of fatal injury!
Commissioning by qualified personnel only!
Improper commissioning poses a
risk of fatal injury. Have commissioning perfor-
med by qualified personnel only.
DANGER! Risk of fatal injury!
When working on the open switchgear, there's a
danger of electric shock from touching the live
components.
This work must only be carried out by qualified
personnel!
We recommend that you have the system com-
missioned by Wilo customer service.
Before switching on for the first time, the onsite
wiring must be checked, in particular the earthing.

8.1 Checking the direction of rotation

To check the rotating field, you have to check the
phase monitoring relay. If the switch cabinet is
switched on and there is no network fault, the yel-
low LED on the phase monitoring relay should light
up.
In addition, you can also check the direction of
rotation on the pump motor. To do this, briefly
switch the operating mode selection
switch to the left-hand position (manual
mode). When the pump motor runs out, compare
the direction of rotation of the fan wheel and the
direction specified on the pump housing.

8.2 Setting the excess current device

In the case of direct starting, the thermal overcur-
rent relay must be set to rated current IN for the
pump and, in the case of star-delta starting, it
must be set to 0.58*IN. The rated current IN is
Wilo SE 06/2015