Nordmann Engineering AT4 D SPA Display User manual

SERVICE MANUAL
Steam generator
Nordmann AT4 D
2567909 EN 1
NORDMANN
ENGINEERING

3
Contents
1 Introduction 4
2 Settings in the engineering level 5
2.1 Launching the Engineering level 5
2.2 Setting the intensity levels for the fragrance pumps 5
2.3 Setting the replacement interval time for the steam cylinder 6
2.4 Activating/deactivating the drain cooling 6
2.5 Setting GFCI operation 6
2.6 Setting the heating current monitoring 8
2.7 Setting the On/Off hysteresis 9
2.8 Setting the Stop Mode for bathing operation 9
2.9 Setting-up temperature sensor monitoring function 10
2.10 Resetting the control to factory settings 11
2.10 Setting-up countdown function/resetting countdown 12
3 Malfunctions 14
3.1 Operating malfunctions 14
4 Control matrix Steam bath control /
Principle diagram P-regulation 25
4.1 Control matrix Steam bath control 25
4.2 Principle diagram P-regulation 26
4.3 On/Off hysteresis of the supply and the exhaust fan (2-fan operation) 27
5 Water management 28
5.1 The SC system of the Nordmann AT4 D 28
5.2 The use of softenend water for the operation of the Nordmann AT4 D 29
6 Block diagrams 31
6.1 Block diagram CPU 31
6.2 Block diagram power board 32
6.3 Block diagram steam bath board 33

4
1 Introduction
The present service manual is meant for the Nordmann service technician
and assumes a profound knowledge on the Nordmann AT4 D. It is also as-
sumed that the Service technician has notice of the mounting instructions
as well as of the operating instructions of the Nordmann AT4 D and that he
is familiar with the dangers when working on the unit.
The present service manual includes the following information:
– Description of the settings in the engineering level of the Nordmann AT4
D control.
– Information on operational malfunctions
– Information on the control matrix of the steam bath control
– Information on the water management
– Block diagrams of the control electronics

5
2 Settings in the engineering level
2.1 Launching the Engineering level
Select the engineering settings menu:
Path: Main menu > User > Password entry: 1055 > Engineering
Press the <>and < > keys in order to select the individual settings in the engineering level. Detailed
information on the different settings are found in the following chapters.
2.2 Setting the intensity levels for the fragrance pumps
Select “Fragrance” in the engineering menu, then press the <Set> key. Select the intensity level (levels
1 to 5) whose values you would like to modify, then press the <Set> key.
Set the desired interval time in minutes and the pulse duration in seconds for the selected intensity level.
Setting range interval time: 2...20 minutes
Setting range pulse duration: 2...10 seconds
Factory setting: Level 1 = interval time: 10 minutes, pulse duration: 2 seconds
Level 2 = interval time: 8 minutes, pulse duration: 3 seconds
Level 3 = interval time: 6 minutes, pulse duration: 3 seconds
Level 4 = interval time: 4 minutes, pulse duration: 4 seconds
Level 5 = interval time: 3 minutes, pulse duration: 5 seconds
Note: the fragrance pump is active only, if the main contactor of the steam generator is activated and
the system is in steam bath operation.
Engineering Code
1055
Enter Number
Conrm with Set
Esc Set
FactoryReset:Set
Instab.Temp.:Set
Stop Mode :Switch
Min.Request :25/20%
Engineering
Max.op.hr SC:5000h
Drain Cool :On
GFCI :Set
Fragrance :Set
Overcurrent :Float
Esc Set
Level 1
Impulse :2s
Interval :10min
Esc Set
Level 1
Impulse :2s
Interval :10min
Esc Set
Fragrance
Level 2 :Set
Level 3 :Set
Level 4 :Set
Level 1 :Set
Level 5 :Set
Esc Set
Interval
10 min
10 min
Esc Set
Impulse
2 s
2 s
Esc Set
Engineering
Max.op.hr SC:5000h
Drain Cool :On
GFCI :Set
Fragrance :Set
Overcurrent :Float
Esc Set
Main Menu
Light-2 :O
User :Set
Engineering :Set
Fragrance :Set
Diagnostic :Set
Esc Set
Menu
AT4D 65kg/h 400V3
Steam Bath :Standby
Temperature :34°C
Setpoint :48°C
2011-08-31 12:00:00
Light Start
Count Down :Set

6
GFCI
GFCI :Set
GFCI-Mode :On
Esc Set
GFCI-Mode
O
On
Ship
On
Esc Set
Max.op.hr SC
5000
5000
Esc Set
2.3 Setting the replacement interval time for the steam cylinder
Select “Max.op.hr SC” in the engineering menu, then press the <Set> key.
In the upcoming modication dialogue set the desired interval time for the replacement of the steam
cylinder in hours (max. operating hours). The interval time to be set depends on the water quality on site.
Note: First priority for the determination of the maximum operating hours of the steam cylinder has
always the maximum level counts via the level sensor.
Factory setting: 5000 h
Setting range: 100...8000 h
2.4 Activating/deactivating the drain cooling
Select “Drain Cool” in the engineering menu, then press the <Set> key.
In the upcoming modication dialogue activate (On) or deactivate (Off) the drain cooling function. With
activated drain cooling the inlet valve opens during the drain cycle, thus reducing the drain water tem-
perature.
Factory setting: On
Options: On (Inlet valve opens during drain cycle)
Off (Inlet valve remains closed during drain cycle)
2.5 Setting GFCI operation
Select “GFCI” in the engineering menu, then press the <Set> key.
In the upcoming modication dialogue select whether or not the Nordmann AT4 D is connected to a
fault current relay protected mains supply or whether the Nordmann AT4 D is operated on a vessel with
special requirements concerning fault current measurement.
Factory setting: On
Options: On (mains supply with fault current relay protection, main contactor is switched
off during drain cycle)
Off (mains supply without fault current relay protection, main contactor remains
activated during drain cycle)
Ship (mains supply with special requirements concerning fault current measure-
ment, main contactor is switched off during lling and draining cycle)
Engineering
Max.op.hr SC:5000h
Drain Cool :On
GFCI :Set
Fragrance :Set
Overcurrent :Float
Esc Set
Engineering
Max.op.hr SC:5000h
Drain Cool :On
GFCI :Set
Fragrance :Set
Overcurrent :Float
Esc Set
Drain Cool
O
On
On
Esc Set
Engineering
Drain Cool :On
GFCI :Set
Overcurrent :Float
Max.op.hr SC:5000h
Min.Request :25/20%
Esc Set

7
Notes on the function “Ship”
The “Ship” function is used if the Nordmann AT4 D is installed on a vessel. On vessels fault currents are
monitored much more exactly than elsewhere, since these lead to an increased corrosion of the ship trunk.
Due to the fact that small fault currents can ow via the inlet line to earth/mass also during lling, the
main contactor is switched off also during lling cycle with the “Ship” function.
Since no current measurement is possible during lling with deactivated main contactor, the lling time
is controlled via the inlet factor.
Select “Ship” in the GFCI menu, then press the <Set> key.
In the upcoming modication dialogue set the desired inlet factor.
Factory setting: 1(Filling cycle 30 seconds)
Setting range: 0.5 (Filling cycle 10 seconds) up to 2.0 (Filling cycle 60 seconds)
Note: With inlet factor 1 the lling cycle takes 30 seconds then, the inlet valve is closed and the main
contactor is activated, in order to check the current rise. If the desired current value is not yet achieved
(110% of the nominal current), the main contactor is deactivated again, and another lling cycle of
30 seconds starts.
If the current is always too high after a lling cycle of 30 seconds (InletFactor 1), the lling time can be
reduced up to 15 seconds (=> inlet factor 0.5).
Or vice versa if it always takes 2 – 3 lling cycles to reach the desired current value, the lling time can
be increased up to 60 seconds (=> inlet factor 2).
GFCI
GFCI :Set
GFCI-Mode :On
Esc Set
GFCI
InletFactor :1.0
GFCI :Set
GFCI-Mode :On
Esc Set
GFCI-Mode
O
On
Ship
Ship
Esc Set
GFCI
InletFactor :1.0
GFCI-Mode :On
Esc Set
InletFactor
1.0
1.0
Esc Set
Engineering
Drain Cool :On
GFCI :Set
Overcurrent :Float
Max.op.hr SC:5000h
Min.Request :25/20%
Esc Set

8
2.6 Setting the heating current monitoring
Select “Overcurrent” in the engineering menu, then press the <Set> key.
In the upcoming modication dialogue you determine whether the current monitoring shall take place
with a xed (Fixed) or a floating over current threshold (Float).
Factory setting: Float
Setting range: Float (floating over current threshold) or Fixed (fixed over current threshold)
Notes on settings
For the heating current monitoring, there are two over current thresholds:
– The threshold for the excess current is set to 135% of the maximum nominal current (violet, narrow
dashed line in the following diagram). This threshold value is xed and leads always to a draining
of the cylinder and to an emergency shut-down (Error E25) when exceeded.
– The threshold for the over current is set to 125% of the maximum nominal current (W24/E24). If
this threshold value is exceeded the unit tries to reduce the current under 125 % by repetitive drain-
ings. If after 5 repetitive drainings the current value is still above the threshold value of 125 % the
unit goes on error (Error 24).
This threshold is xed based on the maximum nominal current if Fixed is selected (light blue, con-
tinuous line in the following diagram).
With the function Float the over current threshold (red, dash-dotted line in the following diagram)
can be attened. The function Float allows a faster reaction to changes of the control signal.
Overcurrent
Fixed
Float
Float
Esc Set
Engineering
GFCI :Set
Overcurrent :Float
Min.Request :25/20%
Drain Cool :On
Stop Mode :Set
Esc Set
Example:
Nominal current at 100% steam pro-
duction with 400V 10kg/h = 10 A
Actual steam demand 30%
––> Current setpoint value = 3 A
Draining as a result of over current at
4.5 A with setting “oat”
Draining as a result of over current at
12.5 A with setting “Fixed”
20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
0
10
20
30
40
50
60
70
80
90
100
110
120
130
140
Draining characteristics with over current
Nominal current 100%
Current setpoint value
Draining if current value exceeds the set point value by a factor of 1.5 (setting “Float”)
Draining if current value reaches 125 % of the maximum nominal current value (setting “Fixed”)
Forced draining if current value reaches 135 % of maximum nominal current value
Current value in %
Steam production demand in %

9
2.7 Setting the On/Off hysteresis
Select “Min.Request” in the engineering menu, then press the <Set> key.
In the upcoming modication dialogue you determine the minimum demand for switching the unit on
(rst value) and off (second value) (On/Off hysteresis).
Factory setting: 25/20%
Options: 25/20%
17/12%
Notes on settings
To ensure an optimal current measuring/regulation with electrode based steam generators the hysteresis
is set to 25 % (switch on) and 20 % (switch off).
However you can reduce the hysteresis to 17% (switch on) and 12% (switch off).
2.8 Setting the Stop Mode for bathing operation
With this function you can determine whether or not the <Stop> key is suppressed during bathing operation.
Select “Stop Mode” in the engineering menu, then press the <Set> key.
In the upcoming modication dialogue you determine whether the bathing time is automatically controlled
via the set bathing time (setting “Timer”) whilst the <Stop> key is suppressed or whether the bathing
time can be stopped at any time by pressing the <Stop> key (setting “Switch”).
Factory setting: Switch
Options: Switch (bathing time can be stopped at any time with the <Stop> key)
Timer (the bathing time is automatically controlled via the set bathing time, the
<Stop> key is suppressed)
Engineering
Overcurrent :Float
Min.Request :25/20%
Stop Mode :Set
GFCI :Set
Instab.Temp.:Set
Esc Set
Min.Request
25/20%
17/12%
25/20%
Esc Set
Stop Mode
Switch
Timer
Switch
Esc Set
Engineering
Min.Request :25/20%
Stop Mode :Switch
Instab.Temp.:Set
Overcurrent :Float
FactoryReset:Set
Esc Set

10
2.9 Setting-up temperature sensor monitoring function
In order to detect a manipulation on the temperature sensor, the steam bath control features the function
“Instab.Func”. If this function is activated the temperature curve of the temperature sensor is monitored
during steam bath operation. If the temperature decreases by cooling the temperature sensor (e.g. by
the use of a cool rag) within a certain time “Time Range” by more than the set temperature value “Temp
Range”, the steam generator is blocked for a certain time “Lock Time”. If the blocking time has elapsed
the steam generator is enabled again.
Note: temperature monitoring is activate only during steam bath operation and if the door of the steam
bath cabin is closed.
Select “Instab.Temp” in the engineering menu, then press the <Set> key. Select “Instab.Func”, then press
the <Set> key. In the upcoming display activate the monitoring function (On), then press the <Set> key.
Now, determine the desired settings for the temperature sensor monitoring:
• “Temp Range”: Temperature range
Factory setting: 10 °C
Setting range: 1…30 °C
• “Time Range”: Time span for the temperature monitoring
Factory setting: 10 seconds
Setting range: 1…60 seconds
• “Lock Time”: Blocking time for steam production
Factory setting: 120 seconds
Setting range: 1…600 seconds
Instab.Temp.
Instab.Func.:Aus
Esc Set
Instab.Temp.
Temp Range :10°C
Time Range :10s
Lock Time :120s
Instab.Func.:On
Esc Set
Instab.Temp.
Temp Range :10°C
Time Range :10s
Lock Time :120s
Instab.Func.:On
Esc Set
Instab.Temp.
Temp Range :10°C
Time Range :10s
Lock Time :120s
Instab.Func.:On
Esc Set
Instab.Temp.
Temp Range :10°C
Time Range :10s
Lock Time :120s
Instab.Func.:On
Esc Set
Engineering
Stop Mode :Switch
Instab.Temp.:Set
FactoryReset:Set
Min.Request :25/20%
Count Down :Set
Esc Set
Instab.Func.
O
On
On
Esc Set
Temp Range
10 °C
10 °C
Esc Set
Time Range
10 s
10 s
Esc Set
Lock Time
120 s
120 s
Esc Set

11
2.10 Resetting the control to factory settings
Caution! When resetting the control to factory settings, any modied settings in the user level are lost.
Select “FactoryReset” in the engineering menu, then press the <Set> key.
The reset dialogue shows up in the display. Press the <Yes> key to reset the control to factory set-
tings. The control is reset to factory settings and restarted.
Note: By pressing the <No> key the reset procedure can be aborted. The control returns to the engi-
neering menu.
Engineering
Stop Mode :Switch
Instab.Temp.:Set
FactoryReset:Set
Min.Request :20/25%
Count Down :Set
Esc Set
FactoryReset
Are you sure?
No Yes
AT4D
STARTUP:
INIT MODULE
Menu
AT4D 65kg/h 400V3
Steam Bath :Standby
Temperature :34°C
Setpoint :48°C
2011-08-31 12:00:00
Light Start

12
2.10 Setting-up countdown function/resetting countdown
Ex factory the countdown function is disabled. In order to activate the countdown function, you deter-
mine the countdown time (Running time) rst, then you activate the function by entering the unlock code
(Unlock Code). As soon as the countdown function is activated, the set countdown time (Running time)
is decremented, once the steam generator is switched on (standby operation, keep warm operation or
steam operation). If the set running time has elapsed, the unit is blocked and triggers an error (error 15).
The countdown function or error 15 can only be deactivated/reset by entering the unlock code.
Caution! If the unlock code gets lost the CPU board must be replaced or newly programmed.
– Activating the countdown function
Select “Countdown” in the engineering menu, then press the <Set> key.
Now, set the desired countdown time (Running Time), then activate the countdown function by entering
an unlock code (Unlock Code):
• “Running Time”: Operation time in hours (if set time is elapsed the steam generator is
blocked)
Factory setting: 720 h
Setting range: 1…2880 h
• “Unlock Code”: Individual unlock code
Factory setting: void
Setting range: 0…9999
Countdown
Unlock Code :
Running Time:720h
Esc Set
Countdown
Unlock Code :void
Running Time:720h
Esc Set
Countdown
Unlock Code :1239
ProgramReset:Set
Running Time:720h
Esc Set
Unlock Code
1239
1239
Esc Set
Running Time
720 h
720 h
Esc Set
Engineering
Stop Mode :Switch
Instab.Temp.:Set
FactoryReset:Set
Min.Request :20/25%
Count Down :Set
Esc Set

13
– Deactivating the countdown function
Select “Countdown” in the engineering menu, then press the <Set> key.
Select “ProgramReset”, then press the <Set> key. Within the reset dialogue press the <Yes> key.
The countdown function is deactivated and the unlock code is reset (void).
Note: the menu item “ProgramReset” shows up only if the countdown function was activated.
Note: the countdown function may also be deactivated via the menu User --> Maintenance -->
ProgramReset. For this purpose the unlock code is needed.
Maintenance
Cyl. Reset :Set
HistoryReset:Set
Esc Set
Countdown
Unlock Code :1239
ProgramReset:Set
Running Time:720h
Esc Set
Countdown
Unlock Code :1239
ProgramReset:Set
Running Time:720h
Esc Set
Countdown
Unlock Code :void
Running Time:720h
Esc Set
Running Time
720 h
720 h
Esc Set
ProgrammReset
Are you sure?
No Yes
ProgramReset Code
1239
Enter Number
Conrm with Set
Esc Set
Maintenance
Cyl. Reset :Set
ProgramReset:Set
HistoryReset:Set
Esc Set
ProgrammReset
Are you sure?
No Yes
Engineering
Stop Mode :Switch
Instab.Temp.:Set
FactoryReset:Set
Min.Request :20/25%
Count Down :Set
Esc Set
User Code
3562
Enter Number
Conrm with Set
Esc Set
User
Settings :Set
Modbus :Set
Maintenance :Set
Esc Set
Main Menu
Light-2 :O
User :Set
Engineering :Set
Fragrance :Set
Diagnostic :Set
Esc Set
Menu
AT4D 65kg/h 400V3
Steam Bath :Standby
Temperature :34°C
Setpoint :48°C
2011-08-31 12:00:00
Light Start

14
3 Malfunctions
3.1 Operating malfunctions
E13 Maximum heating time exceeded
Function: indicates that the maximum heating time has been exceeded.
Procedure: this function limits the max. duration of continuous steam bath
operation in the operating mode “week timer”.
Behaviour on activation:
No Warning Error
Display - E13: Max.Heating
LED display: - Red
Fault-Remote: - Error Relay
Error-History: - E13
System: - Unit blocked
Time delay: - According to parameter Max.Heating
Reset: -Unit Off/On
E14 Steam bath cabin door open too long
Function: indicates that the steam bath cabin is open too long during steam
bath operation.
Procedure: this function monitors the door switch during steam bath opera-
tion. If the door is open too long the steam bath operation interrupted until
the door is closed again.
Behaviour on activation:
No Warning Error
Display -E14: Door Open
LED display: - Red
Fault-Remote: - Error Relay
Error-History: - E14
System: - Unit blocked
Time delay: -According to parameter Max.DoorOpen
Reset: - automatic reset

15
E15 Program fault
Function: indicates that the steam generator is blocked via the function
“Countdown”.
Procedure: Error E15 may be reset only if the correct unlock code is
entered. If the unlock code gets lost the CPU board must be replaced or
newly programmed.
Behaviour on activation:
No Warning Error
Display -E15: Program Fault
LED display: - Red
Fault-Remote: - Error Relay
Error-History: - E15
System: - Unit blocked
Time delay: - According to parameter Running Time
Reset: - automatic reset
E18 Temperature measuring instable
Function: indicates that the drop in temperature in the steam bath cabin
is too high.
Procedure: In order to detect a manipulation on the temperature sensor
the temperature curve of the temperature sensor is monitored during steam
bath operation.
If the temperature decreases by cooling the temperature sensor (e.g. by
the use of a cool rag) within a certain time “Time Range” by more than the
set temperature value, the steam generator is blocked.
The temperature monitoring is activate only during steam bath operation
and if the door of the steam bath cabin is closed.
Behaviour on activation:
No Warning Error
Display -E18: Temperat.Instab.
LED display: - Red
Fault-Remote: - Error Relay
Error-History: - E18
System: - Unit blocked
Time delay: - -
Reset: -Automatic reset after blocking time has
elapsed

16
W20, E20 Maximum temperature switch has triggered
Function: indicates that the maximum temperature switch has triggered.
Procedure: if the maximum temperature switch has triggered the whole
system is blocked and error E20A is displayed.
Behaviour on activation:
No Warning Error
Display -E20: Temp.Fuse
LED display: - Red
Fault-Remote: - Error Relay
Error-History: - -
System: - Unit blocked
Time delay: - -
Reset: - automatic reset
W21, E21 Max. level and no current
Function: indicates that the maximum level sensor has triggered.
Procedure: if the water level reaches the maximum level sensor the warning
message W21 is triggered. The maximum level sensor features a software
related switch-off delay of 10 seconds.
If during steam production the warning message W21 is active for more
than 30 minutes and simultaneously the current is below 1.5 % the unit
goes on Error E21.
Behaviour on activation:
Warning Error
Display W21A(B): Cyl.Max.Level E21A(B): Cyl.Max & NoCurr
LED display: - Red lights
Fault-Remote: - Error Relay
Error-History: - E21A(B)
System: No relling on the unit Unit blocked
Time delay: - 30 minutes
Reset: automatic reset Unit Off/On

17
W22, E22 Maximum lling time and W23, E23 No electrode current
Function: monitoring of the lling cycle
Procedure: if the lling cycle ist not nished within 20 minutes (maximum
lling level or reference current not reached) a warning is triggered. If the
current is below 1.5 % warning W23 is triggered otherwise warning W22.
The procedure is as follows:
• 20 minutes lling -> W22 or W23 active
• 20 minutes lling
• 60 minutes waiting
• 20 minutes lling
• 20 minutes lling
• 60 minutes waiting
• 20 minutes lling -> E22 or E23 active
At the end of a lling cycle of 20 minutes the warning message can change
from W22 to W23 or vice versa.
If a module with activated warning W22 or W23 goes on standby the warn-
ing message remains existing (advantage: you can see at any time that a
module has problems with the water supply).
In addition to the normal monitoring of the maximum lling time the lling
cycle is interrupted after 300 seconds for 5 seconds (except with the oper-
ating mode Ship).
When the steam production is restarted (main contactor activated) the lling
valve is blocked for 60 seconds (awaiting current rise due to the heating
up of the water).
Behaviour on activation:
Warning Error
Display W22A(B): Max.Fill Time
W23A(B): No Current
E22A(B): Max.Fill Time
E23A(B): No Current
LED display: - Red
Fault-Remote: - Error Relay
Error-History: - E22A(B) bzw. E23A(B)
System: Unit is lling or waiting Unit blocked
Time delay: - 220 minutes (3 hours 40 minutes)
Reset: automatic reset Unit Off/On

18
W24, E24 Electrode current too high
Function: monitoring of the heating current (Phase L1)
Procedure: if a overcurrent is detected the main contactor is switched off
immediately, a draining is carried out and the Warning W24 is triggered.
Subsequently, the main contactor is activated again. If overcurrent occurs
again, the process is repeated. After 15 drainings the error E24 is triggered
if the current could not be reduced.
The overcurrent monitoring serves for the recognition of slow rising over-
currents. The threshold of 125 % refers to the maximum nominal current.
If however the steam demand drops quickly, so called correction drainings
are carried out with this function, in order to achieve the new working point
faster. The overcurrent is analysed only if the current value determined by
the current measurement is valid, i.e. the software related RC element is
loaded. It takes up to 8.25 seconds until the overcurrent monitoring can be
released.
Behaviour on activation:
Warning Error
Display W24A(B): Over Current E24A(B): Over Current
LED display: - Red lights
Fault-Remote: - Error Relay
Error-History: - E24A(B)
System: Unit is draining Unit blocked
Time delay: - 15 drainings
(Time see table)
Reset: automatic reset Unit Off/On
Cylinder type Draining time
5xx/8xxx 4 seconds
15xx 6 seconds
23xx 8 seconds
32xx/45xx/65xx 12 seconds

19
W25, E25 Maximum admissible electrode current exceeded
Function: monitoring of the heating current (Phase L1)
Procedure: if a overcurrent is detected the main contactor is switched off
immediately, a draining is carried out and the Warning W25 is triggered.
Subsequently, the main contactor is activated again. If overcurrent occurs
again, the process is repeated. After 3 drainings the error E25 is triggered
if the current could not be reduced.
The excess current monitoring serves for the recognition of fast rising over-
currents. The threshold of 135 % refers always to the nominal current of the
steam generator and therefore it does not depend on the steam demand.
The current value is analysed even if the software related RC element is not
yet loaded. Thus it can be ensured that a fast rising current can be switched
off, before the fuse is triggered.
Behaviour on activation:
Warning Error
Display W25A(B): Excess Current E25A(B): Excess Current
LED display: - Red lights
Fault-Remote: - Error Relay
Error-History: - E25A(B)
System: Unit is draining Unit blocked
Time delay: - 3 drainings
(Time see table)
Reset: automatic reset Unit Off/On
Cylinder type Draining time
5xx/8xxx 30 seconds
15xx 40 seconds
23xx 40 seconds
32xx/45xx/65xx 60 seconds
E26 Current without demand
Function: current monitoring while the contactor is switched off.
Procedure: if during operation with deactivated main contactor a current
higher than 1.5 % is registered the error E26 is triggered and the unit is
blocked. Error E26 is triggered and the system is blocked too, if during the
calibration of the unit (after switching the unit on) a certain current value is
exceeded.
Behaviour on activation:
No Warning Error
Display -E26A(B): Req. Off Current
LED display: - Red
Fault-Remote: - Error Relay
Error-History: - E26A(B)
System: - Unit blocked and cylinder is draining
Time delay: - 30 seconds
Reset: -Unit Off/On

20
W27, E27 Foam detection
Function: monitoring of foam formation in the steam cylinder.
Procedure: to detect the formation of foam the current value when the water
gets in contact with maximum level sensor (lling end) and the current value
when the water looses the contact with the maximum level sensor are set
in relation to each other.
This relation is called CurrentDrop:
CurrentDrop = ISensor-Off / ISensor-On
If the CurrentDrop value is less than 0.8, a counter is increased by 1. If the
counter has counted up from 0 to 1, a waiting period of 30 minutes starts.
During the waiting time the CurrentDrop is not analysed. If the counter counts
up to 2, the warning W27 is triggered. If the counter has reached the value
of 6 the cylinder is drained and the counter is reset to 0. If within 24 hours
4 drainings occurred the error E27 is triggered.
– CurrentDrop < 0.8:
––> Counter + 1
– CurrentDrop ≥ 0.8 or lling end with 110% current:
––> Counter - 1 (not < 0)
– Counter ≥ 2:
––> W27A(B)
– Counter = 6
––> cylinder draining
– 4 drainings within 24h
––> E27A(B)
Reset of Warning W27
If after a draining the CurrentDrop is ≥ 0.8, the warning is reset automatically.
The warning message is reset too, if the counter has counted back to 0.
Behaviour on activation:
Warning Error
Display W27A(B): Foam E27A(B): Foam
LED display: - Red lights
Fault-Remote: - Error Relay
Error-History: W27A(B) E27A(B)
System: Unit is draining Unit blocked and cylinder draining
Time delay: 30 minutes 24 hours
Reset: automatic reset Unit Off/On