English
Installation and operating instructions: Wilo-SC-Fire Diesel A2P
11
Operating mode
The operating mode of the switchgear is configurable via the 2 key switches, simply select one of the three
positions on the key switches “Auto”, “0” or “Manual”.
Diesel motor start-up in
case of
...
Key switch no. 1 (for the pressure switch no. 1)
AUTO
OFF
MANUAL
Key switch
no. 2
(for the
pressure
switch
no. 2)
AUTO
Activation of pressure
switch no. 1
or
Malfunction of pressure
switch no. 1
or
Activation of pressure
switch no. 2
or
Malfunction of pressure
switch no. 2
or
Detection of a low level of
the start-up tank
Activation of pressure
switch no. 2
or
Malfunction of pressure
switch no. 2
or
Detection of a low level
of the start-up tank
Activation of pressure
switch no. 2
or
Malfunction of pressure
switch no. 2
or
Detection of a low level of
the start-up tank
or
Key switch no. 1 in
“Manual” position
OFF
Activation of pressure
switch no. 1
or
Malfunction of pressure
switch no. 1
or
Detection of a low level of
the start-up tank
-
Key switch no. 1 in
“Manual” position
MANUAL
Activation of pressure
switch no. 1
or
Malfunction of pressure
switch no. 1
or
Key switch no. 2 in
“Manual” position
or
Detection of a low level of
the start-up tank
Key switch no. 2 in
“Manual” position
Key switch no. 1 in
“Manual” position
or
Key switch no. 2 in
“Manual” position
Table 3: Operating modes
Automatic mode
To operate the unit in automatic mode, put the key switches (Fig. 1, pos. 8, 9) in the “Auto” position, the “Auto”
position is thus confirmed by the 2 green LEDs on the HMI (Fig. 2, pos. 30, 31).
The unit starts up automatically once the pressure switch no. 1 activates (drop in pressure, contact opening
width) and the key switch no. 1 is in the “Auto” position or once the pressure switch no. 2 activates and the key
switch no. 2 is in the “Auto” position.
The status of the pressure switches is signalled by a green or yellow LED (Fig. 2, pos. 34, 35).
In the event of a cable cut or connection malfunction of one of the 2 pressure switches, a red LED is activated
(Fig. 2, pos. 36, 37). This malfunction causes the diesel motor to start up automatically.
In automatic mode, the diesel motor also starts up if the level of the start-up tank is less than 2/3 full. The motor
only stops through the intervention of a technician.
