VICI DBS NM PLUS Series User manual

1
NM PLUS HYDROGEN GENERATOR
USER MANUAL www.vicidbs.com
Version 1.06.0000
TECH SUPPORT
Europe, Asia, Africa, Australia & New Zealand:
[e-mail]
USA, Canada, Central & South America:
[e-mail]
Italy
[e-mail]
VICI AG INTERNATIONAL
Parkstrasse 2
CH-6214 Schenkon
Switzerland
tel: [phone]
fax: [phone]
web: www.vicidbs.com
APPLICABLE MODELS
This manual is applicable to the following models:
• NM Plus 100
• NM Plus 160
• NM Plus 250
• NM Plus 300
• NM Plus 400
• NM Plus 500
• NM Plus 600
• NM Plus 1000
• NM Plus 1350
Version 1.06.0000

2
NM PLUS HYDROGEN GENERATOR
USER MANUAL www.vicidbs.com
Version 1.06.0000
Table of Contents
1. VERSION HISTORY.......................................................................................................................... 3
2. INTRODUCTION.............................................................................................................................. 4
2.1. Symbols Denition.........................................................................................................................4
3. SAFETY............................................................................................................................................ 5
3.1. Notes of FCC Compliance.............................................................................................................5
3.2. Correct Use ...................................................................................................................................5
4. WARNING ....................................................................................................................................... 5
5. SPECIFICATIONS ............................................................................................................................. 6
5.1. Functionality ..................................................................................................................................7
5.2. Most Common Options ................................................................................................................8
5.2.1. Remote Connections (optional)...........................................................................................8
5.2.2. Cascading (optional) ...........................................................................................................9
5.2.3. Auto Rell (optional)..........................................................................................................10
6. INSTALLATION AND INITIAL START UP ....................................................................................... 11
6.1. Receiving the Generator..............................................................................................................11
6.2. Packing List .................................................................................................................................12
6.3. Placing the Generator .................................................................................................................12
6.4. Gas Connections.........................................................................................................................13
6.5. Electrical Connections ................................................................................................................13
6.6. Initial Start-Up .............................................................................................................................14
6.6.1. Filling the Water Tank.........................................................................................................14
6.6.2. Installing the Deionizer Bag ...............................................................................................15
6.6.3. Starting the Generator .......................................................................................................16
7. OPERATION................................................................................................................................... 17
7.1. LCD Display..................................................................................................................................17
7.1.1. Layout of the Display..........................................................................................................17
7.1.2. First Row - Status Information ...................................................................................... 17-18
7.1.3. Second Row - Pressure Information ...................................................................................19
7.1.4. Third Row - Hydrogen Flow ...............................................................................................19
7.1.5. Fourth Row - Water Quality................................................................................................19
7.1.6. Start/Stop - Reset Button ...................................................................................................19
7.1.7. Exit - Menu Button .............................................................................................................19
7.2. Menu Operation..........................................................................................................................20
7.2.1. Congure Parameters ........................................................................................................21
7.2.2. Diagnostic Display..............................................................................................................22
7.2.3. Special Functions ...............................................................................................................22
8. RETURNING THE GENERATOR..................................................................................................... 23
TABLE OF CONTENTS

3
NM PLUS HYDROGEN GENERATOR
USER MANUAL www.vicidbs.com
Version 1.06.0000
9. MAINTENANCE............................................................................................................................. 24
9.1. Routine Maintenance ...................................................................................................................24
9.1.1. Cleaning .............................................................................................................................24
9.1.2. Water Relling ....................................................................................................................24
9.1.3. Deionizer Bag Replacement......................................................................................... 24-25
9.1.4. Installing the New Deionizer Bags .....................................................................................25
9.2. Maintenance Kit ..........................................................................................................................26
10. SCHEMATICS ............................................................................................................................... 26
10.1. Fluidic Schematics ............................................................................................................... 26-27
10.2. Electrical Schematics............................................................................................................27-28
11. SPARE PARTS LIST.................................................................................................................. 29-31
TABLE OF CONTENTS
1. VERSION HISTORY
VERSION DATE COMMENT/CHANGE
1.00.0100 1/10/2017 Layout and initial release, VICI DBS
1.01.0000 Update
1.02.0000 5/25/2018 Added the NM Plus 1350 model, VICI DBS
1.03.0000 12/20/2018 Release new version, VICI DBS
1.04.0000 3/4/2019 New layout, images and graphics, VICI Gig Harbor Group
1.05.0000 6/1/2020 Minor edits, remove 450 model, VICI DBS
New layout, images and graphics, VICI Gig Harbor Group
1.06.0000 02/03/2021 Minor edits, new uidic and electrical schematics, VICI DBS

4
NM PLUS HYDROGEN GENERATOR
USER MANUAL www.vicidbs.com
Version 1.06.0000
2. INTRODUCTION
This manual provides operation and maintenance instructions for the models NM-100, NM-160, NM-250,
NM-300, NM-400, NM-500, NM-600, NM-1000 and NM-1350 Plus Hydrogen generators.
2.1 Symbol Denitions
SYMBOL DESCRIPTION
General warning. Caution is necessary when operating the device or control
close to where the symbol is placed, or to indicate that the current situation
needs operator awareness or operator action in order to avoid undesirable
consequences.
The manual must be consulted in all cases where this symbol is marked on
the device.
Risk of asphyxia. Caution is necessary when operating the device in a not
sufciently ventilated area.
Oxidant material. Caution is necessary due to the presence of oxidant
material.
WEEE symbol. When discard this product, it must be sent to separate
collection facilities for recovery and recycling.
Fuse. Notify replaceable fuse place.
Earth symbol: This symbol marks the earth connections on the chassis of the
hydrogen generator.
OR
OR
OR

5
NM PLUS HYDROGEN GENERATOR
USER MANUAL www.vicidbs.com
Version 1.06.0000
3. SAFETY
3.1. NOTES OF FCC COMPLIANCE
3.2. CORRECT USE
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant
to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful
interference in a residential installation. This equipment generates, uses and can radiate radio frequency
energy and, if not installed and used in accordance with the instructions, may cause harmful interference
to radio communications. However, there is no guarantee that interference will not occur in a particular
installation.
If this equipment does cause harmful interference to radio or television reception, which can be
determined by turning the equipment off and on, the user is encouraged to try to correct the interference
by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the distance between the equipment and the receiver.
• Connect the equipment to an outlet on a circuit different from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
The hydrogen generator is designed to produce hydrogen for laboratory use. The unit should only
be used for this purpose, according to the specications and instructions provided in this manual. In
particular, the following warnings must be observed at all times:
• Indoor use only.
• Never operate the unit at temperatures below zero degrees C. This will cause irreversible damage to
the electrolysis cell.
• Use only pure water (see “Filling the water tank”).
• Operate the unit in a room with sufcient ventilation (see “Placing the unit”).
• Always unplug the unit from the mains power supply before accessing the internal
components for service or repair work.
4. WARNING
Any changes or modications to this equipment not expressly approved by the
manufacturer may void the user’s authority to operate the equipment.

6
NM PLUS HYDROGEN GENERATOR
USER MANUAL www.vicidbs.com
Version 1.06.0000
5. SPECIFICATIONS
HYDROGEN
FLOW RATE AT STP
STANDARD TEMPERATURE
AND PRESSURE (20°C, 1 BARG)
CELL-TYPE: PROTON- EX-
CHANGE MEMBRANE (PEM)
- 100% TI
CELL PART-NUMBER (PN)
NM Plus 100 0-100 cc/min Cell-pn: DB-Cell-MI
NM Plus 160 0-160 cc/min Cell-pn: DB-Cell-MI
NM Plus 250 0-250 cc/min Cell-pn: DB-Cell-MU1
NM Plus 300 0-300 cc/min Cell-pn: DB-Cell-MU1
NM Plus 400 0-400 cc/min Cell-pn: DB-Cell-MU2
NM Plus 500 0-500 cc/min Cell-pn: DB-Cell-MU2
NM Plus 600 0-600 cc/min Cell-pn: DB-Cell-MU2
NM Plus 1000 0-1000 cc/min Cell-pn: DB-Cell-MU3
NM Plus 1350 0-1350 cc/min Cell-pn: DB-Cell-MU4
MAX OUTLET PRESSURE 11 barg (160 psi)
PURITY 99.99996%+
POWER CONSUMPTION (W)
AND WEIGHT (KG)
NM Plus 100 100 W 14 kg
NM Plus 160 120 W 14 kg
NM Plus 250 165 W 15 kg
NM Plus 300 205 W 15 kg
NM Plus 400 210 W 16 kg
NM Plus 500 220 W 16 kg
NM Plus 600 255W 16 kg
NM Plus 1000 385 W 17 kg
NM Plus 1350 410 W 18 kg
INPUT VOLTAGE 110-120 V / 60 Hz 220-240 V / 50 Hz
FUSE 4A (5 x 20)
PRESSURE ACCURACY 0.1 bar (± 0.5 %)
MICROPROCESSOR
CONTROLLED DISPLAY
Graphic Display- Touch Screen, 128 x 64 pixels
INDEX OF PROTECTION IP2X
OPERATION CONDITIONS:
- TEMPERATURE
- RELATIVE HUMIDITY
15°C to +35°C
0-80%, non condensing
OVER VOLTAGE
CATEGORY
II
POLLUTION DEGREE 2
NOISE LEVEL 46 dB(A)
CASE DIMENSIONS 230w x 370d x 507h mm

7
NM PLUS HYDROGEN GENERATOR
USER MANUAL www.vicidbs.com
Version 1.06.0000
5.1. FUNCTIONALITY
The hydrogen generator produces pure hydrogen (and Oxygen as a by-product) by the electrolysis of
water. The key element of the generator is an electrochemical cell assembly which contains a solid polymer
electrolyte. No free acids or alkaline are used. Deionized or pure distilled water is the only liquid which will
come into contact with the cell. As this is consumed it must be relled from time to time as required.
The hydrogen is passing the hydrogen/water separator and the permeation drying tube. The pressure is
controlled by current. The hydrogen then passes through the outlet port at the rear.

8
NM PLUS HYDROGEN GENERATOR
USER MANUAL www.vicidbs.com
Version 1.06.0000
5.2. THE MOST COMMON OPTIONS
5.2.1. Remote Connections (optional)
The hydrogen generators are tted with an optional remote control feature (USB-RS232), which allows
the user to check the status of the generator from a remote position, and to start/stop the production of
hydrogen.
The contacts used in the remote control are potentially free relay contacts. The contacts can be congured
via software as normally-open or normally-closed (see the Conguration section). The maximum voltage
and current ratings for the contacts are 1A / 48V. The pin conguration of the remote connector is shown
in the table below.
Remote connector pin conguration
Pin Description
1 + 2 Start (12-30 VDC polarity not important)
3 + 4 Standby
5 + 6 Reaching external pressure
8 + 15 Rell water with a 24Vdc – 1A max valve. Needs gravity. Select “Yes” in the
rell menu
9 + 10 Low water level
11 + 12 Bad water
13 + 14 Change water
For part-numbers for the remote connector option please consult the list on page 11.

9
NM PLUS HYDROGEN GENERATOR
USER MANUAL www.vicidbs.com
Version 1.06.0000
5.2.2. Cascading (optional)
The RS-485 interface allows up to 10 generators to be operated in parallel mode.
The generators are connected with an external no-return valve to a gas line. The pressure must be
controlled with an external pressure regulator. The outlet pressure is xed to 10.3 bars. This mode allows
up to 10 generators in a cascading group.
How does cascading work?
The communication between the generators is done via the RS-485 Interface. For a correct communication
each generator needs a unique ID-number. Each generator must know how many generators are
connected in the cascading group. As soon as the generators are powered up, one generator becomes
the master, and controls the others (slaves). If there is a problem with the master, one of the slave
generators will become the master.
Every generator can be forced to be the master, by opening the menu you will see the function “Force to
Master”, just select this function and acknowledge.
When a generator is the master, you can see the letter “M” in the menu button, while the slaves show the
letter “S”.
The cascading function will only work properly if the gas outlets of all the generators
are connected to the same gas line.
GAS LINE
PRESSURE CONTROLLER
NON RETURN VALVE NON RETURN VALVES
H2OUT
GENERATOR 1
H2OUT
GENERATOR 2
H2OUT
GENERATOR 3
CONFIGURATION
Cascading Mode: YES
N. Gen H2 in Cascading: 3
ID Number: 1
RS-485 Port 1 RS-485 Port 2
CONFIGURATION
Cascading Mode: YES
N. Gen H2 in Cascading: 3
ID Number: 2
RS-485 Port 1 RS-485 Port 2
CONFIGURATION
Cascading Mode: YES
N. Gen H2 in Cascading: 3
ID Number: 3
RS-485 Port 1 RS-485 Port 2

10
NM PLUS HYDROGEN GENERATOR
USER MANUAL www.vicidbs.com
Version 1.06.0000
5.2.3. Auto Rell (optional)
The auto rell option will give you the possibility to rell the water tank of the generator automatically
from an external water source. You can either use a deionized water line or a reservoir with deionized
water.
The kit includes a pump and a valve - they assure a constant ow of water.
The system automatically recognizes when to start and when to stop the relling process.
Installation
1. Connect the water tubes and the electric wires as shown in the diagram below.
2. Congure the generator as follows:
- Set the generator to “Standby”
- Set the auto rell function to “On”
For part-numbers for the auto rell option please consult the list below

11
NM PLUS HYDROGEN GENERATOR
USER MANUAL www.vicidbs.com
Version 1.06.0000
6. INSTALLATION AND INITIAL START UP
6.1. RECEIVING THE GENERATOR
All units have been carefully inspected before transport. Visual checks for damage and functional tests
should be performed upon receipt. Any damage must immediately be noted and reported. The generator
must only be returned according to the shipping instructions provided.
ATTENTION: Conserve the ORIGINAL packaging is case of a return.
Ordering Information for Options Part Number
Boards and Interfaces
I/O Board pn: DB-10154
Remote Control RS232 (Software + Cable) pn: DB-PH200-107
Remote Control USB (Software + Cable) pn: DB-PH200-108
Cascading
Cascading Hardware Kit pn: DB-CASC-001
On/Off and non-return Valve pn: DB-CASC-002
Buffer Reservoir 0.75 liters pn: DB-CASC-003
Cable for cascading, requires I/O Board pn: DB-10157
PR with Pressure Gauge pn: DB-CASC-004
Auto-Rell
Auto-Rell Plus, requires I/O Board pn: DB-PH200-109
Auto-Rell Tubing Kit, Set A + B for 2 units pn: DB-10159
Auto-Rell Tubing Kit, Set C to add 1 more unit pn: DB-10160

12
NM PLUS HYDROGEN GENERATOR
USER MANUAL www.vicidbs.com
Version 1.06.0000
6.2. PACKING LIST
6.3. PLACING THE GENERATOR
List of items included in the shipment:
Quantity Description
1Hydrogen generator
1Instruction USB key
1D e i o n i z e r t r i a n g l e b a g
1Water drain with exible tubing
1Power cable
1USB cable
The hydrogen generator must be placed on a at, level, vibration- and shock-free surface. Do not place
the generator near a heat source, as this may cause the generator to overheat. The unit should not be in
contact with any other objects on any side, and the Air inlet must not be blocked. Leave at least 30 cm
of free space at the rear for ventilation. Do not operate the generator in a sealed or unventilated room,
near open ames or other sources of ignition. Do not operate the generator at temperatures below zero
degrees C. Operation is guaranteed at temperatures between +15 and +35°C.
Normal precautions as for any hydrogen supply should be taken when using the
generator. DO NOT use in sealed or unventilated rooms. DO NOT use near open
ames or other sources of ignition.

13
NM PLUS HYDROGEN GENERATOR
USER MANUAL www.vicidbs.com
Version 1.06.0000
6.4. GAS CONNECTIONS
6.5. ELECTRICAL CONNECTIONS
Pure dry hydrogen at regulated pressure is available at the hydrogen outlet port at the rear of the
generator. This port must be connected to 1/8” tubing using a stainless-steel or copper Swagelok
connector. Teon connectors are not suitable. The pressure at this port is adjusted and shown on the
display. The hydrogen relief port and the hydrogen vent at the rear of the unit can be connected to an
exhaust hood or another venting system. Remove the cap from the H2 vent.
IMPORTANT
Remove the plugs from the
hydrogen vents before operating
the unit.
Keep these plugs for transporting
the unit.
Check the setting of the voltage selector at the rear of the unit. The set voltage is indicated in the white
square on the inlet power lter. To change the voltage, proceed as follows:
• Using a small screwdriver, remove the voltage selector insert.
• Move the voltage selector insert so that the white arrow points to the correct volt age.
The line from the relief port should never be connected in such a way that back
pressure can develop.

14
NM PLUS HYDROGEN GENERATOR
USER MANUAL www.vicidbs.com
Version 1.06.0000
6.6. INITIAL START-UP
6.6.1. Filling the Water Tank
To ll the water tank, remove the cap underneath the slider of the water tank. Carefully ll the tank with
distilled or deionized water.
The conductivity of the water used in the generator must not exceed 2μS/cm.
Fill the tank to the maximum level indicator. Close the slider cap.
Do not ll the water tank higher than up to the maximum mark.
To prevent contamination of the cell assembly, it is important to use only deionized
or distilled water in the generator. Water containing metallic impurities will
contaminate or damage the cell and will void the warranty.

15
NM PLUS HYDROGEN GENERATOR
USER MANUAL www.vicidbs.com
Version 1.06.0000
6.6.2. Installing the Deionizer Bag
The deionizer bags have been designed for high water purifying capacity. Use the rst set of 2 bags in the
new hydrogen generator for about 2 months of operation.
After this time, you can use the deionizer bags for up to 6 months or less depending on the water
conductivity.
After having lled the tank with distilled or deionized water, the 2 deionizer bags (supplied) must be
placed in the tank. Inspect the bags thoroughly for holes or tears, indicated by loose deionizer beads on
the outer surface. If the bags are damaged, discard and replace them with new ones. Use only original
parts as listed in the Spare Parts List. Wash the deionizer bags in deionized water before proceeding.
Insert the free end of the “T” fastener through the hole in the center of the holder, until it is securely
fastened. The bags should not block the outlet at the bottom of the tank. Once in place, the bags should
not be allowed to dry out.

16
NM PLUS HYDROGEN GENERATOR
USER MANUAL www.vicidbs.com
Version 1.06.0000
6.6.3. Starting the Generator
1. Once the previous operations have been performed, the generator is ready for operation.
2. Check that the tank is lled with deionized water.
3. Check that the hydrogen outlet connector is tightly tted.
4. Turn the Power switch to the “ON” position.
5. Enter the desired set pressure, using the menu buttons and selecting “Pressure Adjust”.
6. Press the “Start” button to start the unit (if the unit has been congured for “Auto Start” - see
Conguration - it will start automatically).
7. The unit will immediately begin to build up pressure. The LCD display will show the message
“Reaching Normal Pressure”, and the H2 ow bar will indicate maximum ow (fully illuminated).
8. Wait until the “Act Pressure” reaches the set value. These values are shown on the LCD display. It may
take a few minutes to reach the set operating pressure.
1. Once the pressure reaches the set value, the LCD display will show the message “Normal
Pressure” and the H2 ow bar will indicate no ow (no segments illuminated). This indicates
that there are no gas leaks with in the generator itself.
2. Open the shutoff valve. The outlet pressure will fall initially. The pressure drop and the duration
are depending on the volume consumed by the external equipment connected to the generator.
3. After the initial pressure drop, the outlet pressure should stabilize at the set pressure. A continuous
pressure drop indicates a gas leak in the external equipment, or a too high hydrogen consumption.
Check the external equipment for leaks or excessive hydrogen consumption.
4. The generator is now in normal operating mode.
If the generator does not build up pressure as required, the unit will shut down.
Refer to the troubleshooting table.

17
NM PLUS HYDROGEN GENERATOR
USER MANUAL www.vicidbs.com
Version 1.06.0000
7. OPERATION
7.1. LCD DISPLAY
7.1.1. Layout of the Display
7.1.2. First Row - Status Information
All the important information is shown on the display.
The LCD display provides the following information:
Shows current status of the generator. The information can be divided into 3 groups:
Information: Displays normal operating status.
Pre-Alarm: Indicates that a maintenance intervention will soon be required; accompanied by an
audible signal.
Alarms: Indicates that a maintenance intervention is required and that the generator has been shut
down; accompanied by an audible signal.
Example of an alarm message

18
NM PLUS HYDROGEN GENERATOR
USER MANUAL www.vicidbs.com
Version 1.06.0000
MESSAGE DESCRIPTION TYPE ACTION
Standby Device ready for H2 production Information Press Start
Reaching Internal
Pressure
Device producing H2 and increasing
pressure to the internal set pressure.
hydrogen valve is closed
Information
Ready Device is at internal pressure point and
holds the pressure. Some hydrogen is
used to regenerate the dryer system
Information
Reaching external
Pressure
Device producing H2 and increasing
pressure to the internal set pressure.
hydrogen valve is open.
Information
Normal ow Device producing hydrogen and has
reached the set pressure value, with
hydrogen owing
Information
Rell Water Water level approaching alarm threshold Pre-Alarm Fill the tank with water
Change Water The conductivity of the water has ex-
ceeded 10µS/cm
Pre-Alarm Drain and then rell the tank.
Change the deionizer bags
Check auto rell Internal water tank cannot be lled with-
in the autorell timeout.
Pre-Alarm Check and rell external tank
Increase the autorell timeout
Clock Failure The clock is not set. If the generator is
disconnected for more than 2-4 week,
the time setting may be lost.
Pre-Alarm Set clock
Low Int. Pressure The internal pressure cannot be reached Alarm Check for internal leaks
Low Out Pressure The external pressure cannot be reached Alarm Check for external leaks Check
max. H2 consumption
Low Ext. Pressure The external pressure cannot be hold Alarm Check for external leaks Check
max. H2 consumption
Low Water Level There is not enough water in the tank Alarm Rell the tank
Bad Water The conductivity of the water has ex-
ceeded 15µS/cm
Alarm Drain and then rell the tank.
Change the deionizer bags
High Cell Voltage High cell voltage Alarm Notify service agent, cell must
be replaced
Water ow error Too less water ows through the cell and
ow meter
Alarm Check water is in the tank. Call
service to check if the cell or
owmeter is blocked
PS temp high Temperature on the main board reaches
70°C
Alarm Check if all fans are working. Air
stream is not blocked
Dryer Failure Communication failure between dryer
module and main board
Alarm Check cable.
Shock/Fall The G-force sensor is activated due too
high force example earthquake
Alarm Check connections, tubing etc
before restart generator.

19
NM PLUS HYDROGEN GENERATOR
USER MANUAL www.vicidbs.com
Version 1.06.0000
7.1.5. Fourth Row - Water Quality
This graph shows the quality of the water. With more than 3 points illuminated, water quality is good.
If only 3 or less points are illuminated, the conductivity of the water is around 10µs (pre-alarm level).
If only 1 or no point is illuminated, the conductivity of the water is equal to or greater than 15µs (alarm).
The generator will be shut down.
7.1.6. Start/Stop - Reset Button
The “Start/Stop” button places the generator in normal operating mode from “Standby” and vice-versa.
It is also used to re-start the unit following an alarm. When the problem leading to the alarm has been
resolved, the generator must be reset using the “Reset” button, and then can be started again by pressing
the “Start/Stop” button.
Silences the audible alarm. When the problem leading to the alarm has been resolved, the “Reset” button
must be pressed before the generator can be restarted (also see “Special Functions”).
The “Reset” button is also used to access the menu.
7.1.7. Exit - Menu Button
“Exit” returns to previous display
“Exit” conrms a selected parameter, e.g. YES/NO
Only the last point on the ow graph will ash. This indicates that the generator is
producing at maximum capacity. During normal operation, this should not be the
case, as it indicates that the consumption is near the maximum limit and the unit may
shut-down if consumption increases further. Maximum ow is normal when the unit is
building up pressure.
7.1.3. Second Row - Pressure Information
“Act” is the actual pressure of the hydrogen, whilst “Set” is the set pressure. The pressure can be
increased using the up arrow button, or decreased using the down arrow button.
7.1.4. Third Row - Hydrogen Flow
This row displays the current quantity of hydrogen being produced. Each point represents about 10 % of
maximum capacity. This graph also indicates approximately how much hydrogen is being consumed by
the connected equipment.

20
NM PLUS HYDROGEN GENERATOR
USER MANUAL www.vicidbs.com
Version 1.06.0000
7.2. MENU OPERATION
The status of the generator is shown on the main screen of the graphic display.
The main screen has three options at the bottom, corresponding to the three buttons on the unit and the
touch screen, which are used to run the various functions and access the conguration and diagnostics of
the generator, following the tree structure shown in the gure below.