Wilo -SiFire FIRST Installation And Operating Instructions Manual page 50

en
10.1.2 Operating mode
50
Switchgear of diesel pump
Network frequency
1
Pump room temperature
2
Pressure switches status
3
Operating mode
4
Battery voltage A and B
5
Motor oil pressure
6
Fuel level
7
Motor oil temperature
8
Motor working hours
9
Motor speed
10
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Operating mode selection is obtained by means of the external selection switch.
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When the control unit is not in automatic mode, the red front LED (d) lights up to in-
dicate that it is not ready to start from the pressure switch signal.
Automatic mode:
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In this mode it monitors the status of the pressure switches or the priming tank float
and in the event of a lack of pressure detected it proceeds with attempts to start the
motor.
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The lack of the signal (opening of the contact) of the pressure switches is high-
lighted by the flashing of the backlight of the display (visible from a great distance)
and by the flashing word PRESS on the display screen.
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In case of activation of the priming tank float, "LIV.ADESC." is flashing on the display
screen.
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As per regulations, the automatic starting attempts are alternated between bat-
tery A and battery B. The device always remembers with which battery the last at-
tempt was made and the next one will be on the alternative battery. The currently
selected battery is indicated by the yellow LED.
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As soon as one of the starting relays is energised, it is verified that the feedback sig-
nal of the inserted pinion is at the correct voltage. If this is not the case, the relay is
de-energised and then re-inserted with a new attempt.
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If the motor start is detected (speed higher than the set threshold) the starting relay
is de-energized. The state of the motor running is indicated by the green LED.
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If, on the other hand, the motor does not start, the attempt continues for the set
maximum time (default 6s) and then pauses and attempts with the alternative bat-
tery relay.
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The attempts are alternated up to the set maximum number, after which the alarm
A31 failed motor start is generated.
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When the A31 alarm occurs, the display shows the instructions for manual reset of
the alarm (LED/MAN TEST button). The reset will only be possible after the motor
has started successfully.
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Once the motor has started automatically, it will not stop again until the pressure
switches have not been reset and an operator has not performed the stop by press-
ing the front STOP button.
Manual mode:
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When the device is in manual mode (situation highlighted by the red LED and the
message on the display screen) it does not monitor the status of the pressure
switches or the priming tank float.
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In this mode it is possible to operate the manual keys START A and START B to verify
the correct functioning of the system during the verification and maintenance oper-
ations.
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The above-mentioned keys are operative only in the manual mode or in case of an
internal failure of the switchgear.
Test procedure:
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The periodic verification procedure involves the simulation of pressure loss of the
system with the consequent attempt to start automatically.
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According to the regulations, it must be verified that, by artificially preventing the
motor from starting (fuel shutdown) the system is able to make all the expected
starting attempts and to generate the A31 alarm.
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As a consequence of this situation, the fuel must be restored and it must be verified
that the next starting cycle is successful. This second start cycle is started by press-
ing the MAN TEST key (yellow led activated).
WILO SE 2020-12