Troubleshooting; Introducing The Analogue Pressure Switch Pla - Smeg GW0160 Technical Manual

6 TROUBLESHOOTING

6.1

INTRODUCING THE ANALOGUE PRESSURE SWITCH PLA

PLA:
analogue level sensor, also known as the analogue pressure switch.
The analogue pressure switch is a sensor connected to the air trap inside the device, used to monitor the water level in the chamber. Since
it is an analogue sensor, it allows continuous control of the water level present, unlike a conventional pressure switch, which is only able to
identify 1 or 2 different levels.
The analogue pressure switch emits a frequency signal of 630/625Hz with the device empty, with no water in the chamber. The device
establishes the actual value of its "zero" reading each time it resets.
As the water level increases, the PLA signal in Hz decreases.
In this manual, we will refer to relative values (L0, L1, etc.) in relation to zero rather than absolute values, since the absolute zero value is
set each time the device resets.
Possible states Description of state
of the PLA
pressure switch
L0 – Zero
Chamber empty
L1 - "Empty" – pressure
levels
switch reset
Chamber full L2 - "Full"
level
L3 - Safety level with
washing pump active
ML=ON Limit threshold level
L4 - Water in Chamber (in
stby).
Limit threshold
Standby status by limit
levels
threshold level.
L5 - Safety level with
washing pump off ML=OFF.
static condition limit
threshold level.
For versions prior to 5.0 fw apply the following levels
Possible states of the
PLA pressure switch
Chamber empty levels
Chamber full level
Limit threshold levels
NOTE the amount of water entering the machine is measured by the water flowmeters (FLMT_F, FLMT_D in the diagrams).
The pressure switch PLA is used to intercept any abnormal situation.
Description of state
L0 – Zero
L1 - "Empty" – pressure switch reset
L2 - "Full"
L3 - Safety level with washing pump active
ML=ON Limit threshold level
L4 - Water in Chamber (in stby).
Standby status by limit threshold level.
L5 - Safety level with washing pump off
ML=OFF. static condition limit threshold level.
Signal in Hz with T in chamber < 40 °
[guideline values]
GW/WD2145
Zero
25
31
60
60
65
Signal in Hz with T in
chamber < 40 °
[guideline values]
6
Signal in Hz with T in
chamber > 40 °
[guideline values]
OTHERS GW/WD2145
Zero Zero
25 18
31 24
57 60
60 60
63 65
Signal in Hz with T in
chamber > 40 °
[guideline values]
Zero
25
31
57
60
66
OTHERS
Zero
18
24
57
60
63
Zero
18
24
57
60
66