10
4.2 Description of function
Control takes place via the functions described below.
Automatic operation
If the pressure switch detects a pressure drop in the fire pump
pipes, engine starting will be activated after a delay of about 2.5
seconds. The starter will be activated for a start attempt duration
of about seven seconds. If the engine does not start, up to five
additional start attempts of seven seconds each will take place at
intervals of three seconds. Prior to each new start attempt, a
changeover between starting units takes place.
After six failed start attempts, the controller is locked and the
indication H12 "Error start" is shown. To reset the indication and
return to automatic operation, press the button S4 "Start error/
release". If the start command is still active via the pressure
switches, the start program will be carried out again.
After a successful start, the engine monitoring (H4) will be
switched on after a delay of about seven seconds. Faults, such
as H17 "Oil pressure low", H18 "Overtemperature" and H20
"Electric generator dropped out", result only in alarms, not in
stopping the engine.
The engine can only be stopped manually by means of the button
S3 "Fire pump off".
If the automatic start command still exists while the engine is
being stopped, the indication H2 "Fire pump stopped" will be
shown. This indication will only disappear when the start
command of the pressure switch is not active any more.
Manual operation
Via the buttons S1 "Fire pump on, starting unit 1" or S2 "Fire
pump on, starting unit 2" the pump is started by means of starting
unit 1 or 2.
No automatic program run takes place in manual operation.
When the two on-buttons are pressed, the starter relays will be
cut in directly and the solenoid switch of the starter will be cut in
with a time delay, i.e. when the engine has started, the on-button
must be released.
The engine is stopped with the button S3 "Fire pump off", and the
controller returns to automatic operation.
Monitoring of voltage supply
The supply voltage is monitored to detect phase failures. In case
of mains failure, the control voltage will be obtained from the
starter batteries.
Monitoring of pressure switches
The pressure switches are monitored by monitoring the quiescent
current (quiescent current resistance 470 Ohm, load current
resistance 470 Ohm) to detect wire breakage and short-circuit.
The start command lines are redundantly designed. Each
pressure switch is connected to a monitoring and start command
trigger line. Existing start commands are shown by the indications
H7 "Pressure switch 1 triggered" or H9 "Pressure switch 2
triggered".
Fault conditions, such as voltage failure of monitoring, wire
breakage or short-circuit, are shown for the pressure switch in
question (yellow indicator light H8 "Pressure switch 1 fault", H10
"Pressure switch 2 fault").
Monitoring of fuel system
The position of the fuel tap and the fuel filling quantity are
monitored in the same way as the pressure switches.
Fuel shortage is only indicated if the shortage exists for more
than five seconds (H23 "Fuel shortage").
Monitoring of oil pressure
If the oil pressure is reduced, a warning will be given (H17 "Oil
pressure low"). The oil pressure is monitored via a pressure
sensor on the engine when the engine has been started and the
engine monitoring has been cut in. The fault is indicated when it
has existed for more than five seconds.
Monitoring of temperature
A warning is given if the permissible engine temperature is
exceeded (H18 "Overtemperature"). The temperature is
monitored via a temperature sensor on the engine when the
engine has started and the engine monitoring is switched on. The
fault is indicated when it has existed for more than five seconds.
Monitoring of electric generator
A warning is given if the electric generator fails (H20 "Electric
generator dropped out"). The electric generator is monitored
when the engine has started and the engine monitoring (H4) is
switched on. The controller monitors whether the electric
generator produces 24 V when the engine has started.
Locking of automatic starting after several failed attempts
After the sixth failed start attempt, a warning is given (H12 "Error
start"), and automatic starting is locked (H13 "Diesel auto-start
locked"). The lock can be cancelled with the button S4 "Start
error/release".
While the automatic starting is locked, the engine can still be
started manually.
Monitoring of batteries
If the battery voltage falls below the specified value or no battery
is connected, a warning will be given (H14 "Battery set 1 fault",
H15 "Battery set 2 fault"). Both battery sets are monitored.
Monitoring of engine operation
All faults are indicated acoustically by a horn. The indication is
reset with button S6 "Horn off/reset".
All faults are also indicated by an indicator light.
The fault is indicated by a flashing indicator light. The indicator
light changes to permanently on when the button S6 "Horn off/
reset" is pressed.
Every new fault is indicated by a flashing indicator light and must
be reset with the button S6 "Horn off/reset".
When the faults have been cleared, the button S6 "Horn off/reset"
must be pressed to reset the fault indications.
Interruption of the fuel supply
Via a solenoid valve the controller automatically interrupts the
fuel supply when the pump unit is switched off.
Blinds control
To ensure a sufficient supply of fresh air to the engine and a
targeted heat removal, it may be necessary to install blinds. The
blinds can be controlled via the control cabinet. The starter
batteries power the motors of the blinds, which are opened with
the indication H1 "Fire pump operation" or closed when the
engine is switched off.
Cooling water heater
Some pump units are equipped with a cooling water heater for the
engine. For this purpose, the control cabinet contains a 10 A
circuit breaker. The heater adjusts itself via an external cooling
water thermostat.
Control buttons and meters
Button
Colour
mark
Me
ters
Description
Dis.
Display
S1
Green
Fire pump on, starting unit 1
S2
Green
Fire pump on, starting unit 2
S3
Red
Fire pump off
S4
Yellow
Start error/release
S5
-
Indicator light test
S6
-
Horn off/reset
S7
-
Menu scrolling
H0
Horn (acoustic)
P1
Tachometer [min
-1
x 1000]
P2
Oil pressure [bar]
P3
Cooling water temperature
P4
Amperemeter, battery set 1
P5
Voltmeter, battery set 1
P6
Amperemeter, battery set 2
P7
Voltmeter, battery set 2
P8
Hour counter
