ELTEX KNH18 User manual

Operating Instructions
KNH18 High Voltage Generator
BA-en-3018-2006
F00021

2BA-en-3018-2006_KNH18

BA-en-3018-2006_KNH18 3
List of Contents
1 Outline of Appliance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2 Safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 Identification of risks and hazards . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2 Contact protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.3 Technical advance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.4 Proper use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.5 Work and operational safety. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3 Installation and Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1 Assembly of the high voltage generator . . . . . . . . . . . . . . . . . . . . . 11
3.2 Grounding. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.3 Installation of the high voltage cables. . . . . . . . . . . . . . . . . . . . . . . 12
3.4 Charging bars suitable for connection . . . . . . . . . . . . . . . . . . . . . . 13
3.5 Connecting the high voltage cable to the generator and
to the distribution box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.6 Disconnecting the high voltage cable . . . . . . . . . . . . . . . . . . . . . . . 15
3.7 Connecting the supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.8 Connecting the release signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.1 Start-up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.2 Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.1 High voltage generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.2 Charging bars . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6 Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
8 Technical specifications KNH18 . . . . . . . . . . . . . . . . . . . . . . . . . 20
8.1 Technical specifications KNH18__D . . . . . . . . . . . . . . . . . . . . . . . 20
9 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
10 Spare parts and accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Declaration of Conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

4BA-en-3018-2006_KNH18

BA-en-3018-2006_KNH18 5
Dear customer,
The KNH18 High Voltage Generator is a multi-purpose voltage supply unit
for any high voltage application and for Eltex DC-operated charging bars.
The following bar models are available for connection:
R130A/R131A
R120/R121A (note voltage limitation according to Operating Instructions
R120/R121A) and
R23ATR.
The output voltage of the KNH18 high voltage generator is selected via
the rotary button in the front panel.
High voltage is released via an external 24 V signal.
Please read these instructions carefully before starting the unit. This will
help you prevent personal injuries and damage to property.
Simply give us a call if you have any suggestions, proposals or ideas for
improvements. We greatly appreciate the feedback from the users of our
appliances.

6BA-en-3018-2006_KNH18
1. Outline of Appliance
1 High voltage output 1
2 High voltage output 2
3 Ground terminal
4 Connector, release signal (not with type KNH18/__D)
5 Socket, system input
6 Fuse (see nameplate)
7 Master switch ON/OFF
8 Rotary button for setpoint settings (not with type KNH18/__D)
9 Pilot lamp
Fig. 1:
KNH18
High Voltage
Generator
Z00093y
KNH18
1 2 3 4 5 6 7 8 9

BA-en-3018-2006_KNH18 7
2. Safety
The units have been designed, built and tested using state-of-the-art engi-
neering, and have left the factory in a technically and operationally safe
condition. If used improperly, the units may nevertheless be hazardous to
personnel and may cause injury or damage. Read the operating instruc-
tions carefully and observe the safety instructions.
2.1 Identification of risks and hazards
Possible risks and hazards resulting from the use of the units are referred
to in these operating instructions by the following symbols:
Warning!
This symbol appearing in the operating instructions refers to operations
which, if carried out improperly, may result in serious personal injuries.
Caution!
This symbol appearing in the operating instructions refers to operations
which, if carried out improperly, may result in damage to property.
Ex Warning!
For units with EX approval only.
This symbol denotes the special conditions which must be observed when
operating the system in explosion hazard areas as specified in the EX
approvals.
2.2 Contact protection
The site of installation and/or use of the units is outside the control of
Eltex, contact protection against inadvertent contact of the bars and of live
components by personnel as specified by the employer’s liability insu-
rance association may have to be provided (e.g. DGUV V3 in Germany).
Contact protection devices made of conductive material must be
grounded.
2.3 Technical advance
The manufacturer reserves the right to make changes to the technical
specifications without prior notice in order to adapt the units to state-of-
the-art engineering. Eltex will provide the latest information on any
changes or modifications in the operating instructions on request.
Ex!

8BA-en-3018-2006_KNH18
2.4 Proper Use
The KNH18 high voltage generator has been approved as operating volt-
age generator for the appropriate Eltex charging bars. It must be operated
only with the appropriate Eltex bars (see chapter Installation and Assem-
bly for bar models).
If the unit is used in any other high voltage application, the manufacturer´s
warranty covers the safe use in terms of technical safety.
The manufacturers will not assume any liability and warranty if the units
are used improperly or used outside the intended purpose.
Modifications or changes made to the devices are not permitted.
Use only original Eltex spare parts and equipment.
2.5 Work and operational safety
Warning!
Carefully observe the following notes and the complete chapter 2 "Safety”,
page 7!
Always observe the rules and regulations applying in your country with
reference to opening and repairing electrical appliances.
• Before carrying out repairs, cleaning or maintenance work and before
resetting the unit after malfunctions, switch off the high voltage genera-
tor and disconnect the mains power supply (see chapter 5 "Mainte-
nance”, page 18, chapter 7 "Troubleshooting”, page 19).
• Any work involving the units must be carried out by qualified electri-
cians (see chapter 5 "Maintenance”, page 18, chapter 7 "Troubleshoot-
ing”, page 19).
• Before carrying out any work involving the units, the machine which has
the units fitted must not be in operation (see chapter 3.3 "Installation of
the high voltage cables”, page 12, chapter 3.6 "Disconnecting the high
voltage cable”, page 15, chapter 5 "Maintenance”, page 18, chapter 7
"Troubleshooting”, page 19).
• Before putting the high voltage generator into operation make sure that
the appliance is permantly grounded via the ground terminal (3, Fig. 1).
The ground cable should have a minimum cross section of 1.5 mm2
and be connected to ground along the shortest possible routing via a
conductive cable. A cross section of 2.5 mm2is required for cable
lengths exceeding 0.5 meters (see chapter 3.2 "Grounding”, page 11).
• If the housing cover is removed and the supply voltage is switched on
at the same time, contact protection is no longer effective. Always dis-
connect the power before opening the units.

BA-en-3018-2006_KNH18 9
• The IP 40 protection class applies only if the lid of the enclosure is
closed and the cable entries are covered, and this only in areas where
IP 40 protection class is sufficient.
• The site of installation must be dry and free of dust, if possible. Air cir-
culation above the cooling ribs must not be obstructed (see chapter 3.1
"Assembly of the high voltage generator”, page 11).
• When routing the high voltage cable observe all notes in chapter 3.3
"Installation of the high voltage cables”, page 12.
• The high voltage cable must be pushed up to the stop (90 mm) into the
cable inlet! The connecting area of the high voltage cable must be kept
clean (see chapter 3.5 "Connecting the high voltage cable to the gener-
ator and to the distribution box”, page 14).
• Disconnect and/or connect the mains cable on the socket only when
off-load (see chapter 3.7 "Connecting the supply voltage”, page 15).
• Connect or remove the bars only after the supply voltage to the high
voltage generator has been disconnected.
• Before activating the unit, the user must make sure that the unit has
been correctly installed and that the connections are properly made.
The supply voltage can then be switched on (see chapter 4 "Opera-
tion”, page 17).
• Select the desired output voltage via the rotary button. High voltage
may also be present if the rotary button is turned fully anti-clockwise to
the stop (see chapter 4.2 "Use”, page 17).
• The generator must be checked regularly to ensure its proper function-
ing. The connections of the high voltage cables must be free of dirt and
other foreign matter (see chapter 5.1 "High voltage generator”,
page 18).
• When cleaning do not soak the bars and the high voltage cable in sol-
vent and do not damage the emission tips; allow the solvent to evapo-
rate completely before restarting the unit (see chapter 5.2 "Charging
bars”, page 18).
• Check the units, the electrical wiring and the hight voltage cable at
regular intervals and before startup for any damage. Any damaged
components must be repaired profesionally or replaced before conti-
nuing to operate the units, or the bar or cable must be disabled.
• Make sure that the bars are clean at all times. Dirt results in malfunc-
tions and in premature wear of the units.
• The operation of the bars can generate ozone. The ozone concentra-
tion levels developing near the bars depend on many different factors
such as site of installation, bar current and voltage, air circulation, etc.,
and can therefore not be specified in general terms.
If the maximum allowable concentration of ozone must be observed at
the site of installation of the , the concentration must be measured on
site.

10 BA-en-3018-2006_KNH18
The AGW value (maximum admissible concentration) serves to assess
the ozone concentration at the workplace. The user must make sure
that the appropriate national AGW value is at no times exceeded, e.g.
in Germany the ozone concentration occurring during the operation of
the system must not exceed the recommended value based on interna-
tional limits of 0.06 ml/m³ (0.12 mg/m³).
•Static on personnel
Static charges on personnel are unlikely if the bars are installed prop-
erly. Personnel must wear conductive footwear.
Please note all national regulations regarding electrostatic charge (e.g.
TRGS 727 in Germany).

BA-en-3018-2006_KNH18 11
3. Installation and Assembly
3.1 Assembly of the high voltage generator
The unit is designed either for wall assembly or table mounting. Attach the
unit using the assembly/mounting brackets supplied with the unit (see fig-
ure). The bulging of the holes in the support plate must point in the direc-
tion of the generator. When mounting the unit make sure that the
operating elements and the connector terminals remain accessible and
that control of the unit is not impaired.
The site of installation must be dry and free of dust, if possible. Air circula-
tion above the cooling ribs must not be obstructed.
3.2 Grounding
Before putting the high voltage generator into operation make sure that
the appliance is permantly grounded via the ground terminal (3, Fig. 1).
The ground cable should have a minimum cross section of 1.5 mm2and
be connected to ground along the shortest possible routing via a conduc-
tive cable. A cross section of 2.5 mm2is required for cable lengths
exceeding 0.5 meters
Fig. 2:
Installation of the
high voltage
generator with
supporting plate
Z00181y
330
>100
212
128
170
M8
M8
M6
M6
386
2,5
410
27

12 BA-en-3018-2006_KNH18
3.3 Installation of the high voltage cables
In case of fixed installations a minimum bending radius of 5 times the
external diameter must be maintained and in case of dynamic installa-
tions a minimum bending radius of 10 times the external diameter must be
maintained when routing the high voltage cable.
• Do not route the cable over sharp edges (bending radius <5 mm).
• Keep a minimum spacing of 50 mm between low voltage and high
voltage cables; if this cannot be done, shield the low voltage cable.
• If the high voltage cables are led through bores in conductive, grounded
materials, the minimum bore diameter D is calculated as follows from
the wall thickness of the material:
D = 60 mm²/wall thickness.
Allow the biggest possible radius for the edges of the bore hole. Use an
insulating grommet to centre the cable.
• If ungrounded and conductive objects are placed near (2m) the high
voltage cable, influenced charges and sparking must be expected.
Proper ground connection is therefore important.
In applications using movable bars (e.g. film draw strips), attach the high
voltage cables such that there is no cable movement near the connection
point to the generator/power supply.

BA-en-3018-2006_KNH18 13
3.4 Charging bars suitable for connection
The following charging bars are suitable for connecting to the KNH18 high
voltage generator:
• Point charging bars R23ATR,
• Charging bars R130A/R131A,
• Charging bars R120/R121A (note voltage limitation according to Ope-
rating Instructions R120/R121A).
The KNHV3 distributor box, available as an optional extra, allows the user
to increase the number of bars connected. When using this option make
sure that the sum of the bar currents does not exceed 1.3 mA.
Example:
current per meter of active bar length: 1 mA
Sum of active bar lengths: 1.3 m
=> maximum total current: 1.3 mA
Fig. 3:
Installing the
generator, the
distributor box and
the charging bars
1 = KNH18
2 = Distributor box
3 = High voltage cable
4 = Charging bars
Z00177y
KNH34
3
12
4

14 BA-en-3018-2006_KNH18
3.5 Connecting the high voltage cable to the generator and to the
distribution box
Warning!
Electric shock hazard!
Work may be carried out only if:
• the supply voltage to the generator has been disconnected,
• the machine is at a standstill because the bars pick up charges if the
material web is running.
Method:
Connect the bars via the prefabricated high voltage cable. Push the high
voltage cables up to the stop into the socket connection. Finally, secure
the adapter inside the socket with the clip provided.
Cables without adapters have a color-coded marking on the flexible
tubing. This marking must lie flush with the outside edge of the coupling.
Note: The clip must be fully inserted.
correct incorrect
Caution!
The high voltage cable must be pushed up to the stop (90 mm) into the
cable inlet! The connecting area of the high voltage cable must be kept
clean!
Fig. 4:
Connecting the
high voltage cable
Z00178y
Fig. 5:
Inserting the clip
Z00018y

BA-en-3018-2006_KNH18 15
3.6 Disconnecting the high voltage cable
Warning!
Electric shock hazard!
Work may be carried out only if:
• the supply voltage to the generator has been disconnected,
• the machine is at a standstill because the bars pick up charges if the
material web is running.
Take off the clip at the generator and/or the R131 bar, using a 3 mm screw
driver. Then pull out the cable.
A conversion kit comprising terminal adapter, tubular rivet, split-pin plug
and washer is available as accessory from Eltex.
3.7 Connecting the supply voltage
Supply voltage connection to the high voltage generator is made directly
via the mains plug using the enclosed mains cable.
Warning!
Disconnect and/or connect the mains cable on the socket only when off-
load.
When using external protection fusing for generators, the following circuit-
breaker must be used:
6 A; tripping characteristic D in compliance with DIN VDE 0641, part 11;
EN 60898-1.

16 BA-en-3018-2006_KNH18
3.8 Connecting the release signal
High voltage is enabled / disabled via an external 24 V signal.
Connect the lead of the release signal via the 5-pin connector (4, Fig. 1).
The pin assignment is shown in Fig. 6.
Cables prefabricated at one end are available for connection to this plug
(see accessories).
Note!
We recommend enabling / disabling the 24 V release signal via a machine
contact so that the high voltage is disabled when the machine is not run-
ning. This configuration will ensure that high voltage is not applied at the
bars with the machine stopped.
Fig. 6:
Pin assignment for
the 24 V release
signal
PIN 1: 24 V DC
PIN 2: -
PIN 3: -
PIN 4: -
PIN 5: 0 V
Z00185y
12
3
4
5
Fig. 7:
Connecting cable
KS/C for the
release signal
Wire colors:
1 = white
2 = brown
3 = green
4 = yellow
5 = grey
Z000010y
1
2
3
4
5
KS/C Schirm/shield/ecran

BA-en-3018-2006_KNH18 17
4. Operation
4.1 Start-up
Warning!
Before activating the unit, the user must make sure that the unit has been
correctly installed and that the connections are properly made.
The supply voltage can then be switched on.
The high voltage generator is switched on via the master switch.
The generator is operational immediately after the supply voltage is
switched on. High voltage applies at the outlet sockets as soon as the
24 V release signal is transmitted.
The pilot lamp ligths up when the high voltage is switched on.
4.2 Use
Select the desired output voltage via the rotary button.
Warning!
High voltage may also be present if the rotary button is turned fully anti-
clockwise to the stop.
Anti-clockwise turn: Reducing the output voltage.
Z00182y
Clockwise turn: Increasing the output voltage.
Z00183y
40 50
60
70
80
90
100
30
20
10
0
40 50
60
70
80
90
100
30
20
10
0

18 BA-en-3018-2006_KNH18
5. Maintenance
Warning!
Electric shock hazard!
• Do not carry out any maintenance or repair work without first switching
off the high voltage generator and disconnecting the supply voltage.
• The machine which has the units fitted must not be in operation.
• Repairs and maintenance work must be carried out by qualified person-
nel only.
5.1 High voltage generator
The generator must be checked regularly to ensure its proper functioning.
The cooling fins must be kept clean and the connections of the high volt-
age cables must be free of dirt and other foreign matter. The intervals for
the check depend on the application and must hence be defined by the
user according to the operating conditions. The generator itself does not
require any maintenance.
5.2 Charging bars
To ensure the proper function of the charging bars, clean weekly with
compressed air free of oil and water (max. 6 bar) and a brush with soft
plastic bristles.
Remove encrusted dirt (e.g. grease, adhesive, ink, etc.) from the charging
bars with cleaning gasoline or a similar solvent. Do not immerse bars and
the high voltage cable in solvent!
Warning!
Risk of deflagration!
Wait until the solvent has evaporated before restarting the generator.
Caution!
Do not damage the emission tips of the charging bars.

BA-en-3018-2006_KNH18 19
6. Warranty
The units are warranted for a period of 12 months provided that the opera-
ting conditions have been maintained, that the units have not been tam-
pered with and that the units show no mechanical damage.
The warranty applies only if the operating and assembly instructions spe-
cified by Eltex have been observed. The warranty period begins on the
date of delivery.
In the event of defects occurring during the warranty period, the units or
defective components will be repaired at Eltex. Defective components will
be replaced and installed free of charge.
If repairs are required at the customer's premises, the costs for sending a
technician (travel, travel time, expenses) will be charged to the customer.
7. Troubleshooting
Warning!
Electric shock hazard!
• Do not carry out any maintenance or repair work without first switching
off the high voltage generator and disconnecting the supply voltage.
• The machine which has the units fitted must not be in operation.
• Repairs and maintenance work must be carried out by qualified person-
nel only.
Defect/Error Defect/Cause Remedy
Generator cannot be
switched on.
• Defective fuse.
Device overloaded.
• Supply voltage not
connected.
• Replace fuse, (fuse
type see nameplate).
Check the number of
consumers.
• Connect or activate
supply voltage.
Generator fails to
supply high voltage.
Device defective. • Notify Eltex Service.

20 BA-en-3018-2006_KNH18
8. Technical specifications KNH18
8.1 Technical specifications KNH18/__D
Type KNH18/__D is a non-adjustable generator version without enabling
contact with a fixed output voltage of 15 kV and Imax of 200µ.
Output voltage 0…+25 kV DC ±10 % (KNH18P__)
0…–25 kV DC ±10 % (KNH18N__)
Adjustable by rotary button
AC component of the
output voltage 25 % at Umax and Imax
Output current max. 1.3 mA
Supply voltage 230 VAC ±10 %, 50 Hz (KNH18_2_)
115 VAC ±10 %, 60 Hz (KNH18_1_)
Fuse Fuse type see nameplate
Power input max. 75 VA
Enclosure Sheet metal steel, 1.5 mm, painted,
aluminium anodised
Protection class IP40
Operating ambient
temperature 0…+60°C (+32…+140°F)
Storage temperature –20…+70°C (–4…+158°F)
Ambient humidity max. 80 % rel. humidity, no dewing
Dimensions with
supporting plate 410 x 212 x 162 mm (H x W x D)
Weight 10.5 kg