Carel pCO Series Troubleshooting guide

Application program for pCO
pCO Stage Controller
Manual version: 3.1 - 09/11/99
Program code: EPSTDEIU0A
Rif.: 96EM

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TABLE OF CONTENTS
DETAILS OF THE PROGRAMME.........................................................................................................................2
USER INTERFACE....................................................................................................................................................2
TERMINAL UNIT: FRONT PANEL VIEW WITH FRONT DOOR CLOSED...............................................................................2
SILICONE RUBBER EXTERNAL BUTTONS ......................................................................................................................2
FRONT VIEW WITH FRONT DOOR OPEN ........................................................................................................................3
USE OF THE BUTTONS .................................................................................................................................................3
DISPLAY .....................................................................................................................................................................4
FUNCTION INDICATOR LEDS.......................................................................................................................................4
LIST OF PARAMETERS...........................................................................................................................................5
ALARM DESCRIPTION ...........................................................................................................................................9
DESCRIPTION OF PARAMETERS......................................................................................................................10
CONNECTIONS .......................................................................................................................................................19
HARDWARE ARCHITECTURE......................................................................................................................................19
MAIN BOARD - LAYOUT ............................................................................................................................................20
MEANING OF THE INPUTS AND OUTPUTS.....................................................................................................22
CONNECTION OF THE INPUTS..........................................................................................................................24
CONNECTION OF THE OUTPUTS......................................................................................................................25
POWER SUPPLY.........................................................................................................................................................25
CONNECTION BETWEEN TERMINAL UNIT AND MAIN BOARD ......................................................................................26
INSTALLATION OF EPROM.......................................................................................................................................26
CONNECTION OF THE OPTIONAL BOARDS..................................................................................................27
SERIAL PRINTER........................................................................................................................................................27
CLOCK BOARD ..........................................................................................................................................................27
USEFUL ADVICE FOR A CORRECT INSTALLATION ...................................................................................28
APPENDIX A: TROUBLESHOOTING .................................................................................................................29
APPENDIX B: CONNECTIONS.............................................................................................................................31
APPENDIX C: EXAMPLES OF APPLIANCES ...................................................................................................32
APPENDIX D: MATERIALS AND CODES..........................................................................................................35

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DETAILS OF THE PROGRAMME
The programme allows full management of a refrigerator plant.
The characteristics of the system are as follows:
- display and control of the measured quantities;
- possible configuration of the number and type of control devices;
- display of alarms actived by the LED display and their audible signals by means of a buzzer;
- programming of the configuration parameters and of some operative parameters with access protected by a
password;
- modification of the basic operation parameters (setpoints, differentials, alarm thresholds, timing);
- LED display of the active functions;
- print of the alarms picked up and, at intervals, the state of the main variables of the machine;
- time band programming makes it possible to operate the devices controlled by the probe 1 from a second
setpoint (secondary) so as to save energy during the programmed hours and days;
- connection with a supervisory/remote controlled maintenance serial line according to the RS422/RS485 standard
and the Carel’s communication system.
USER INTERFACE
Terminal unit: front panel view with front door closed
Figure 1 references
1. External function-indicator LEDS
2. External rubber buttons
3. LED display
4. Front windows
Silicone rubber external buttons
Fig. 2
References Fig. 2
1.
On/off
button: turns on and off the unit. The green LED that lights up in the button shows the state of the
machine:
- if the LED is Off the unit is Off;
- the intermittent LED indicates that the unit has been turned off by a supervisor or a remote control through a
digital input;
- if the LED is on the unit is On.
2.
Alarm
button: it is used to display the alarms, to reset them manually and silence the buzzer.
When the button lights up (red), at least one alarm has been detected.
3. The arrow pointing
upwards
sets the values of the control parameters (it does not light up), or to disable manul
procedure.
4. The arrow pointing
downwards
sets the values of the control parameters (it does not light up), or to disable
manual procedure.
5.
Enter
button: to scan the messages on the display. The button is continuously alight (yellow light) and indicates
that the current is On.
COMPRESSORS
FANS
SET 2
SET EXT
NETWORK
Bar Bar
°C°C
°F °F
Fig. 1

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Front view with front door open
Figure 3 references
1. Polycarbonate - coated mechanical
buttons
2. Function indicator LEDs
3. Adhesive polycarbonate (provided
upon request)
4. Silicone rubber buttons.
Use of the buttons
displays the values measured by the probe 1 and 2 and, moreover, displays the conversion of these
values, from pressure values to temperature values
allows access to the values related the hour counters, operated manually to the connected devices and
allows the adjust of the probes
gives access to the group of parameters for the operation of the printer control (as required)
displays the status of inputs and outputs (both digital and analog)
allows the display/programming of the clock (if present) and of the relevant time range with setpoint
variation
allows the display and selection of the setpoint
allows the setting of both of the different operation parameters (protections, thresholds) and the
parameters concerning the configuration of the unit
displays the version of the application programme
The LEDs beside the listed buttons light up when pressed, and remain in this condition until any one of the above-
mentioned buttons is pressed.
COMPRESSORS
FANS
SET 2
SET EXT
NETWORK
Bar Bar
°C°C
°F
°F
Fig. 3

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Display
Features
• number of digits: 6
• colour: green
• height: 13mm
• number of side indicator LEDs: 5
• number of LEDs indicating the displayed function: 3+3
Function indicator LEDs
The 5 LEDs placed beside the display have the following meaning:
1. On LED at least one device, controlled by the probe 1, is active;
Flashing action at least one device, controlled by the probe 1, is in timing phase, that is its has been required,
but it remains off as long as its timing is fulfilled;
Off LED no device, managed by the probe 1, is active;
2. On LED at least one device, managed by the probe 2, is active;
Off LED no LED, managed by the probe 2, is active;
3. On LED night setpoint is active (sepoint 2);
4. On LED indicates that the setpoint variation is coming from an analog input (external setpoint);
5. On LED indicates that the communication with the supervisory network is active;
The 6 LEDs placed in the display indicate the unit of measure of the values detected by the two linked probes
(selections made in the programming-code branch):
bar pressure;
°C temperature;
°F in degrees Fahrenheit
Obviously only one of the 3 indicated LEDs can be on.
COMPRESSORS
FANS
SET 2
SET EXT
NETWORK
Bar Bar
°C°C
°F°F
Fig. 4

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LIST OF PARAMETERS
All the bold-faced parameters are described from page 10 on
On the following tables there are two
Default
columns: on the right one there are the factory set parameters, decided
by the Carel engineerings (see on page 18). On the left one the user may write its own.
Maintenance button
Code Description Default Rating Units of
measure
t1 device 1 operating-hour display (only if device 1 is enabled) 0÷999999 h
t2 device 2 operating-hour display (only if device 2 is enabled) 0÷999999 h
t3 device 3 operating-hour display (only if device 3 is enabled) 0÷999999 h
t4 device 4 operating-hour display (only if device 4 is enabled) 0÷999999 h
t5 devices operating-hour display (only if device 5 is enabled) 0÷999999 h
t6 device 6 operating-hour display (only if device 6 is enabled) 0÷999999 h
t7 device 7 operating-hour display (only if device 6 is enabled) 0÷999999 h
t8 device 8 operating-hour display (only if device 8 is enabled) 0÷999999 h
t9 device 9 operating-hour display (only if device 9 is enabled) 0÷999999 h
t10 device 10 operating-hour display (only if device 10 is enabled) 0÷999999 h
t11 device 11 or fan-inverter operating-hour (only if fan-inverter or
device 11 is enabled) 0÷999999 h
t12 device 1/valve inverter operating-hour display (only if device
1/valve inverter is enabled) 0÷999999 h
PSt access password to the parameters below 0 0÷999
th device operating-hour threshold (only if there is at least one device) 0 0÷999 hx1000
r1 reset of the device 1 operating-hour number 0 0→disable 1→enable
r2 reset of the device 2 operating-hour number (only if device 2 is enabled) 0 0→disable 1→enable
r3 reset of the device 3 operating-hour number (only if device is enabled) 0 0→disable 1→enable
r4 reset of the device 4 operating-hour number (only if device 4 is enabled) 0 0→disable 1→enable
r5 reset of the device 5 operating-hour no. (only if device 5 is enabled) 0 0→disable 1→enable
r6 reset of the device 6 operating-hour no. (only if device 6 is enabled) 0 0→disable 1→enable
r7 reset of the device 7 operating-hour no. (only if device 7 is enabled) 0 0→disable 1→enable
r8 reset of the device 8 operating-hour no. (only if device 8 is enabled) 0 0→disable 1→enable
r9 reset of the device 9 operating-hour no. (only if device 9 is enabled) 0 0→disable 1→enable
r10 reset of the device 10 operating-hour no.(only if device 10 is enabled) 0 0→disable 1→enable
r11 reset of the device 11 or fan inverter operating-hour no. (only if
device 11 or fan inverter is enabled) 00→disable 1→enable
r12 reset of the device 1/valve inverter operating hour no. (only if
device 1/valve inverter is enabled) 00→disable 1→enable
n1 device 2 manual operation (only if device 1 is enabled) 0 0→disable 1→enable
n2 device 2 manual operation (only if device 2 is enabled) 0 0→disable 1→enable
n3 device 3 manual operation (only if device 3 is enabled) 0 0→disable 1→enable
n4 device 4 manual operation (only if device 4 is enabled) 0 0→disable 1→enable
n5 device 5 manual operation (only if device 5 is enabled) 0 0→disable 1→enable
n6 device 6 manual operation (only if device 6 is enabled) 0 0→disable 1→enable
n7 device 7 manual operation (only if device 7 is enabled) 0 0→disable 1→enable
n8 device 8 manual operation (only if device 8 is enabled) 0 0→disable 1→enable
n9 device 9 manual operation (only if device 9 is enabled) 0 0→disable1→enable
n10 device 10 manual operation (only if device 10 is enabled) 0 0→disable 1→enable
n11 device 11 or fan inverter manual operation (only if device 11 of
fan inverter is enabled) 00→disable 1→enable
n12 device 1/valve inverter manual operation (only if device 1/valve
inverter is enabled) 00→disable 1→enable
CL1 Probe 1 calibration (only if P21>0) 0 -5.0÷5.0 °C/F°/bar
CL2 probe 2 calibration (only if P24>0) 0 -5.0÷5.0 °C/F°/bar
CL3 probe 3 calibration (only if P22=1) 0 -5.0÷5.0 °C/F°

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Printer button
Code Description Default Rating Units of
measure
Pr1 immediate printing request (only if P42=1) 0 0→disable 1→enable
Pr2 selection of the cyclic printing time (only if P42=1) 60 0÷999 min
I/O button
Code Description Default Rating Units of
measure
Ai1 display of the value detected by the probe 1 -99÷99.9 °C/F°/bar
Ai2 display of the value detected by the probe 2 -99÷99.9 °C/F°/bar
Ai3 selection with a potentiometer of the probe 1 setpoint (only if P21=1) or
display of the ambient air temperature (only if P21=0 and if P22=1) -99÷99.9 °C/°F/bar
Ai4 display of the remote on/off state 0→off;1→on
i1 state of the device 1 lock alarm 0→off;1→on
i2 state of the device 2 lock alarm 0→off;1→on
i3 state of the device 3 lock alarm 0→off;1→on
i4 state of the device 4 lock alarm 0→off;1→on
i5 state of the device 5 lock alarm 0→off;1→on
i6 state of the device 6 lock alarm 0→off;1→on
i7 state of the device 7 lock alarm 0→off;1→on
i8 state of the device 8 lock alarm 0→off;1→on
i9 state of the device 9 lock alarm 0→off;1→on
i10 state of the device 10 lock alarm 0→off;1→on
i11 state of the device 11 or fan-inverter lock alarm 0→off;1→on
i12 state of the low pressure/flow regulator alarm 0→off;1→on
Ao1 display of the state of the fan inverter 0÷10.0 volt
Ao2 display of the state of the device 1/valve 0÷10.0 volt
o1 state of the device 1 0→off; 1→on
o2 state of the device 2 0→off;1→on
o3 state of the device 3 0→off;1→on
o4 state of the device 4 0→off;1→on
o5 state of the device 5 0→off;1→on
o6 state of the device 6 0→off;1→on
o7 state of the device 7 0→off;1→on
o8 state of the device 8 0→off;1→on
o9 state of the device 9 0→off;1→on
o10 state of the device 10 0→off;1→on
Clock button
Code Description Default Rating Unit of
measure
C1 hour display (only if P41=1) 0÷23 h
C2 minute display (only if P41=1) 0÷59 min
C3 day display (only if P41=1) 1÷31
C4 month display (only if P41=1) 1÷12
C5 year display (only if P41=1) 0÷99
PSC password that allows the access to the subsequent param. (only
if P41=1) 0 0÷999
C6 hour selection (only if P41=1) 0 0÷23 h
C7 minute selection (only if P41=1) 0 0÷59 min
C8 day selection (only if P41=1) 0 1÷31
C9 month selection (only if P41=1) 0 0÷99
C10 year selection (only if P41=1) 0 0÷99
C11 range-beginning hour with secondary set (only if P41=1) 0 0÷23 h

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C12 range-end hour with secondary set (only if P41=1) 24 0÷24 h
C13 Sunday with secondary set (only if P41=1) 0 0→no; 1→yes
C14 Monday with secondary set (only if P41=1) 0 0→no; 1→yes
C15 Tuesday with secondary set (only if P41=1) 0 0→no; 1→yes
C16 Wednesday with secondary set (only if P41=1) 0 0→no; 1→yes
C17 Thursday with secondary set (only if P41=1) 0 0→no; 1→yes
C18 Friday with secondary set (only if P41=1) 0 0→no; 1→yes
C19 Saturday with secondary set (only if P41=1) 0 0→no; 1→yes
C20 half an hour exclusion (only if P41=1) 0 0÷7
C21 exclusion beginning (only if P41=1) 0 C11÷C12 h
C22 exclusion end (only if P41=1) 0 C21÷C12 h
Setpoint button
Code Description Def
ault Rating Unit of measure
Sd1 display of the probe 1 actual setpoint (enabled code in case of
setpoint control through analog input or if a secondary setpoint
is present or, finally, when the compensation is active)
St3÷St4 °C/°F/bar
St1 selection of probe 1 setpoint (only if P1>0 and P4>0) 2.5 St3÷St4 °C/°F/bar
St2 selection of probe 2 setpoint (only if P24>0 and P27>0) 16.0 St5÷St6 °C/°F/bar
Si1 setpoint selection of the probe 1/valve inverter (only if P20=1
and P14=1) 2.5 St3÷St4 °C/°F/bar
Si2 selection of fan inverter setpoint (only if P35=1) 16.0 St5÷St6 °C/°F/bar
PSS password that allows access to the subsequent parameters 0 0÷999
St3 selection of the probe 1 minimum setpoint (only if P1>0) 0 -99÷99.9 °C/°F/bar
St4 selection of probe 1 maximum setpoint (only if P1>0) 5.0 -99÷99.9 °C/°F/bar
St5 selection of probe 2 minimum setpoint (only if P24>0) 10.0 -99÷99.9 °C/°F/bar
St6 selection of probe 2 maximum setpoint (only if P24>0) 24.0 -99÷99.9 °C/°F/bar
St7 secondary setpoint selection (only if at least a device of the
circuit 1 is present) 3.0 -99÷99.9 °C/°F/bar
d1 probe 1 differential selection (only if P1>0) 0.5 0÷20.0 °C/°F/bar
d2 probe 2 differential selection (only if P24>0) 2.0 0÷20.0 °C/°F/bar
d3 device 1/valve inverter differential (only if P1>0 and P14=1) 1.0 0÷20.0 °C/°F/bar
d4 selection of the fan inverter differential (only if P35=1) 2.0 0÷20.0 °C/°F/bar
Sr1 step of the device 1 inverter (only if P20=1 and P14=0) 0.2 0÷10.0 Volt
Sr2 selec. of the probe 1 inverter deviation (only if P20=1 and
P14=0) 0 0÷20.0 °C/°F/bar
Sr3 minimum aperture of the device 1 inverter (only if P20=1) 0 0÷10.0 Volt
Sr4 minim. aperture of the device 1 inverter always applied (only if
P20=1) 00→disable
1→enable
SH1 threshold of high for the probe 1 (only if P1>0) 5.0 -99÷99.9 °C/°F/bar
SL1 threshold of low for the probe 1 (only if P1>0) 1.0 -99÷99.9 °C/°F/bar
SH2 threshold of high for the probe 2 (only if P24>0) 20.0 -99÷99.9 °C/°F/bar
SL2 threshold of high for the probe 2 (only if P24>0) 0 -99÷99.9 °C/°F/bar
dH1 alarm delay of high for the probe 1 (only if P1>0) 0 0÷999 min
dL1 alarm delay of high for the probe 2 (only if P24>0) 0 0÷999 min
dH2 alarm delay of low for the probe 2 (only if P24>0) 0 0÷999 min
dL2 alarm delay of low for the probe 2 (only if P24>0) 0 0÷999 min
SC compensation setpoint (only if P21=1) 25.0 -99÷99.9 °C/°F/bar
dC compensation differential (only if P21=1) 5.0 -50.0÷50.0 °C/°F/bar
dt delta of compensation (only if P21=1) 2.0 -99÷99.9 °C/°F/bar

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Programming button
Code Description Default Rating Unit of
measure
PSn password that allows access to the programming branch 0 0÷999
P1 probe 1 type 3 0→absent 1→active
2→passive 3→keller
P2 probe 1 lower range (only if P1=3) -0.5 -0.5÷30 bar
P3 probe 1 higher range (only if P1=3) 7 -0.5÷30 bar
P4 probe 1 device number (only if P1>0) 5 0÷11
P5 operating probe 1 devices with active broken-probe alarm (only
if P1>0 and P4>0) 00÷P4
P6 number of voltage variations (see explanation) 0 0÷3
P7 logic of voltage variations (only if P1>0 and P4>0 and P6>0) 0 0→n.excit. 1→n.deen.
P8 minimum time between compressor starting and voltage
variations (only if P1>0 and P4>0 and P6>0) 10 0÷999 sec
P9 full/par activation of volt. variations (only if P1>0 and P4>0 and P6>0) 0 0→full 1→partial
P10 turn on minim. time of the probe 1 devices (only if P1>0 and P4>0 ) 60 0÷999 sec
P11 turning off minim. time of the probe 1 devices (only if P1>0 and P4>0) 120 0÷999 sec
P12 min. time between probe 1 device turning on (only if P1>0 and P14=1) 10 0÷999 sec
P13 minimum time between probe 1 same device turning on “Anti-
court cycle” (only if P1>0 and P4>0) 360 0÷999 sec
P14 regulation with neutral zone or lateral band of probe 1 circuit
(only if P1>0 and P4>0) 00→neutral z.
1→lat. band
P15 type of regulat. of the probe 1 circuit (only if P1>0 and P4>0 and P14=1) 0 0→P 1→P+I
P16 integrat. time of the primary circuit (only if P1>0 and P4>0 and P15=1) 600 300÷900 sec
P17 time between turning on requests of the probe 1 devices (only if
P1>0 and P4>0 and P14=0) 20 0÷999 sec
P18 time between turning off requirements of the probe 1 devices
(only if P1>0 and P4>0 and P14=0) 10 0÷999 sec
P19 rotation enabling of the probe 1 devices (only if P1>0 and P4>1) 1 0→disable 1→enable
P20 inverter enabling of the device no. 1/valve (see explanation) 0 0→disable 1→enable
P21 analog input enabling for setpoint variation (only if P1>0 and
P4>0 and P22=0) 00→disable 1→enable
P22 enabling of the air temperature probe (only if P21=0) 0 0→disable 1→enable
P23 enabling of probe 1 compensation (only if P1>0 and P4>0 and
P21=0 and P22=1) 00→disable 1→enable
P24 probe 2 type 3 0→absent 1→active
2→passive 3→keller
P25 probe 2 lower range (only if P24=3) 0 -0.5÷30 bar
P26 probe 2 higher range (only if P24=3) 30 -0.5÷30 bar
P27 probe 2 device number (only if P24>0) 5 0÷11
P28 min. time betw. turning on of the probe 2 devices (if P24>0 and P27>1) 2 0÷999 sec
P29 regulation with neutral zone or lateral band of the probe 2 circuit
(only if P24>0 and P27>0) 10→neutral z.
1→lat. band
P30 type of regulat. of the probe 2 circuit (only if P24>0 and P27>0 and P30=1) 0 0→P 1→P+I
P31 integration time of the sec. circuit (only if P24>0 and P27>0 and P31=1) 600 300÷900 sec
P32 time between turning on request of the probe 2 devices (only if
P24>0 and P27>1 and P30=0) 20 0÷999 sec
P33 time between turning off requests of the probe 2 (only if P24>0
and P27>1 and P30=0) 10 0÷999 sec
P34 rotation enabling of the probe 2 devices (only if P24>0 and P27>1) 1 0→disable 1→enable
P35 enabling of fan inveter 0 0→disable 1→enable
P36 alarm delay of low pressure/flow regulator (only if P4>0 and/or P27>0) 40 0÷999 sec
P37 enabling of self-starting procedure 1 0→disable 1→enable
P38 type of cooling gas (refrigerant) 1 0→not sel. 1→R22
2→R134a 3→NH3
4→R404a
P39 °C or °F display 0 0→°C;→°F
P40 remote on/off selection 0 0→disable 1→enable
P41 clock enabling 0 0→disable 1→enable
P42 printer enabling 0 0→disable 1→enable

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P43 identification number 1 0÷999
P44 automatic or manual reset alarms 0 0→autom. 1→manual
P45 time delay at the intervention of alarm relay 0 0÷999 min
P46 enabling OFF key 0 0→disable 1→enable
P47 serial communication baud-rate 0 0→1200 1→2400
2→4800 3→9600
4→19200
P61 circuit 1 devices switch off mode 0 0→full 1→partial
P62 cold/warm 0 0→cold 1→warm
Info button
Code Description Def
ault Rating Unit of measure
If1 programme version
ALARM DESCRIPTION
How to manage the
Alarms
, you have to refer to the parameter P44 at page 16
Alarm button
Code Description Effect Verify
AL 1 Exceeded threshold of the device 1 operation hours Only signalling Threshold and hour number
AL 2 Exceeded threshold of the device 2 operation hours Only signalling Threshold and hour number
AL 3 Exceeded threshold of the device 3 operation hours Only signalling Threshold and hour number
AL 4 Exceeded threshold of the device 4 operation hours Only signalling Threshold and hour number
AL 5 Exceeded threshold of the device 5 operation hours Only signalling Threshold and hour number
AL 6 Exceeded threshold of the device 6 operation hours Only signalling Threshold and hour number
AL 7 Exceeded threshold of the device 7 operation hours Only signalling Threshold and hour number
AL 8 Exceeded threshold of the device 8 operation hours Only signalling Threshold and hour number
AL 9 Exceeded threshold of the device 9 operation hours Only signalling Threshold and hour number
AL 10 Exceeded threshold of the device 10 operation hours Only signalling Threshold and hour number
AL 11 Exceeded threshold of the device 11 or fan
inveter operation Only signalling Threshold and hour number
AL 12 Exceed. hour threshold of the device 1/valve inverter Only signalling Threshold and hour number
AL 13 Not operating Eeprom Only signalling
Reset manufacture values and turn the
pCO off.
If when turning on again AL13
remains, replace the
board
AL 14 Probe 1 is not connected or does not operate See page 15 Connections of probe 1
AL 15 Probe 2 is not connected or does not operate See page 15 Connections of probe 2
AL 16 Detection of high-pressure switch/antifreeze Device complete stop Wiring of the digital inputs 1÷10
AL 17 Detection of low-pressure/switch/flow regulator Device complete stop Wiring of the digital input 12
AL 18 Stop of the device 1 Device 1 Stop and
inverter of the device 1 Wiring of the digital input 1
AL 19 Stop of the device 2 Stop of the device 2 Wiring of the digital input 2
AL 20 Stop of the device 3 Stop of the device 3 Wiring of the digital input 3
AL 21 Stop of the device 4 Stop of the device 4 Wiring of the digital input 4
AL 22 Stop of the device 5 Stop of the device 5 Wiring of the digital input 5
AL 23 Stop of the device 6 Stop of the device 6 Wiring of the device 6
AL 24 Stop of the device 7 Stop of the device 7 Wiring of the device 7
AL 25 Stop of the device 8 Stop of the device 8 Wiring of the device 8
AL 26 Stop of the device 9 Stop of the device 9 Wiring of the device 9
AL 27 Stop of the device 10 Stop of the device 10 Wiring of device 10
AL 28 Stop of the device 11 or stop of the fan inverter Stop ofthedevice 11 Wiring of the device 11
AL 29 Probe 1 threshold of high is exceeded Only signalling Wiring of the probe 1 and verification
of the threshold of high
AL 30 Probe 1 threshold of low is exceeded Only signalling Wiring of the probe 1 and verification
of the threshold of low
AL 31 Probe 2 threshold of high is exceeded Only signalling Wiring of the probe 2 and verification
of the threshold of high