NetterVibration NCT Series User manual

Operating instructions for
Netter pneumatic vibrators
Series NCT, NCB and NCR
February 2021
No. 1882E
Page 1/9
Version 1
These operating instructions apply to:
Pneumatic turbine vibrators
NCT 1
NCT 2
NCT 3
NCT 4 / 4i
NCT 5
NCT 10 / 10i
NCT 15
NCT 29 / 29i
NCT 55
NCT 108 / 108i
NCT 126
NCT 250 / 250i
Pneumatic ball vibrators
NCB 1
NCB 2
NCB 3
NCB 5
NCB 10
NCB 20
NCB 50
NCB 70
Pneumatic roller vibrators
NCR 3
NCR 10
NCR 22
NCR 57
NCR 120
Use and storage
Before installing the vibrators read these instructions carefully. It is the basis for any action when dealing
with the vibrators, and may be used for training purposes. The instructions should be subsequently
stored at the operation site.
Copyright
This documentation is protected by copyright. Netter Vibration reserves all rights such as translations,
reprinting and reproduction of the instructions, as well as parts thereof.

2
1 General information
The pneumatic vibrators of the series NCT, NCB and NCR are hereafter
referred to as "vibrators".
Please refer to the delivery note for the scope of delivery.
Check the packaging for possible transport damage. In the event of dam-
age to the packaging, check the contents for completeness and possible
damage. Inform the carrier in the case of damage.
The target group for these instructions is technical staff, who have basic
knowledge in pneumatics and mechanics.
Only complying technical staff may work on the vibrators.
The vibrators may only be installed, put into operation, maintained, trou-
bleshot and disassembled by persons authorised by the operator.
All technical information, data and instructions for installation, operation
and maintenance in these instructions are based on the latest information
available at the time of printing and take our past experience to the best of
our knowledge into account.
No claims can be derived from the information, illustrations and descrip-
tions in these operating instructions.
The manufacturer does not assume liability for damages resulting from:
failure to observe the instructions,
improper use,
unauthorised repairs,
technical modifications,
use of non-permissible spare parts.
Translations are made to the best of our knowledge.
Netter Vibration does not assume liability for translation errors, even if the
translation was made by us or on our behalf. Only the original German text
remains binding.
Explanation of additions to names in model designations:
HT:
models for high ambient temperatures
NCT S:
stainless steel models
NCT i:
models with higher centrifugal force
NCR P:
models with plastic cover
The pneumatic vibrators of the series NCT, NCB and NCR comply with the
EC Machinery Directive 2006/42/EC.
In particular, the standard EN ISO 12100 has been observed.
Designation
Scope of
delivery
Target group
Limitation of
liability
Model
designations
Directives /
standards
observed

3
2 Safety The vibrators are designed for installation in machines.
General applications are: loosening, conveying, sorting, compacting, sepa-
rating bulk materials and reducing friction. The vibrators are used for emp-
tying bunkers, as drives for conveyor troughs, as sieves and vibrating ta-
bles.
The vibrators may also be used outdoors, in dusty and humid environ-
ments.
After consultation with Netter Vibration the NCT may also be used in water
or other liquids.
Any other use is considered improper.
Installation, commissioning, maintenance and troubleshooting of the vibra-
tors may only be performed by authorised qualified personnel.
All handling of the vibrators is the responsibility of the operator.
WARNING
Compressed air
A loosened hose which is under pressure can lead to personal injuries.
Screw the hose lines on carefully.
Check the hose lines and connections after one hour of operation and thereafter regu-
larly (generally monthly).
Retighten the hose lines, if necessary.
Ensure that the compressed air is disconnected from the supply lines during all work on
the vibrators.
Prevent the vibrators from being switched back on during all work.
WARNING
Falling parts
The vibrators, construction parts as well as fastening screws can come loose due to vibra-
tion. Falling parts lead to severe personal injuries.
Check the fastening screws after one hour of operation and thereafter at regular inter-
vals (generally monthly).
Retighten the fastening screws, if necessary.
A safety device with a safety cable is mandatory for critical mounting situations.
WARNING
Sound level
Near the vibrators or in the vicinity of the constructions connected with the vibrators, the
sound pressure level may exceed 80 dB(A). The human ear can be permanently damaged
by the high sound level.
When working in the noise area, use ear protection if 80 dB(A) is exceeded.
Intended use
Qualification
of qualified
personnel

4
NOTICE
Operation of the vibrators with silencers is mandatory.
Silencers reduce the noise level and protect the vibrators from contamination entering.
3 Technical data
Permissible operating conditions
Drive medium
NCT must be operated with clean compressed air or nitrogen according to the
following specification, according ISO 8573-1:
[ 5 :
6 :
2 ]
Filter ≤ 5 µm
Humidity, pressure-
dew point ≤ +10 °C
Total oil content
≤ 0,1 mg/m3
NCB and NCR must be operated with clean compressed air or nitrogen accord-
ing to the following specification, according ISO 8573-1:
[ 5 :
6 :
4 ]
Filter ≤ 5 µm
Humidity, pressure-
dew point ≤ +10 °C
Total oil content
≤ 5 mg/m3
All vibrators can be operated oil-free. A mist lubricator extends the service life of
the NCB and NCR.
Ambient
temperature
Standard: -20 °C to 120 °C
HT-versions: 80 °C to 200 °C (with brass grommet and sintered silencer)
Important: Below the specified ambient temperature (< 80 °C) the performance
of the HT-version is reduced.
Operating pressure
2,0 to 6,0 bar
Max. frequency NCT
The maximum permissible frequency must not be exceeded.
Further technical data can be found in the brochures of the NCT, NCB and NCR on
www. Netter Vibration.com.
Connection data
Type
Thread
Tightening
torque* [Nm]
Connection
thread [inch]
hose/
valve size**
NCT 1, 2, 3, 4, 4i / NCB 1, 2 / NCR 3
M6
10
G 1/8
DN 6
NCT 5, 10, 10i, 15, 29, 29i
NCB 3,5,10,20 / NCR 10, 20
M8
25
G 1/4
DN 9
NCB 50, 70
M10
50
G 3/8
DN 12
NCT 55, 108, 108i / NCR 57
M12
87
G 3/8
DN 12
NCT 126, 250, 250i / NCR 120
M16
210
G 3/8
DN 12
* Screws and nuts of the strength class 8.8 (sliding friction coefficient 0.14) ** DN = Diameter nominal (inner diameter)
Sound level
The sound level is largely determined by the mounting surface (e.g. sheet metal) on which the
vibrator is mounted. Depending on the type, the sound pressure level with a silencer is 75-
85 dB(A) at 6 bar air pressure, at lower air pressure it is below this. Sheet metal which is not
silenced increases the sound level.

5
4 Design and function
1
Housing
2
Air outlet
3
Silencer
4
Hose grommet
5
Air inlet
6
Mounting slots
7
Turbine with unbalances
8
Steel ball
9
Steel roller
Function
The vibrators generate circular vibrations, i.e. the vibrations act in all directions of a plane.
The air inlet (5) and the air outlet (2) are indicated by arrows on the housing (1).
The silencer (3) reduces the sound level and protects the interior of the housing from impurity.
The frequency and therefore also the centrifugal force are determined by the pressure of the
drive medium.
Two mounting slots (6) are provided for fastening.
NCT: A turbine (7) rotates in the housing with eccentrically inserted unbalances. Depending
on the type, a different number of unbalances are pressed into the turbine, so that different
unbalances are possible for each housing size. The turbine is mounted in permanently lubri-
cated rolling bearings. These are fitted in the housing and cover.
NCB: The vibration (circular oscillation) is generated by the centrifugal force of a rotating steel
ball (8) which runs on a hardened steel race. The housing is closed by a pressed-in cover.
NCR: The vibration (circular oscillation) is generated by the centrifugal force of a rotating steel
roller (9) that runs in the housing on an inner ring made of steel.

6
5 Transport and storage
Special conditions of transport are not required.
Storage in a dry and clean environment, protected from UV-exposures,
weather and ozone. Storage temperature: -20 °C to 60 °C.
Close all openings before storage.
6 Installation
Observe the safety instructions in chap. Safety, from page 3 on.
1
Filter regulator
2
2/2-way valve
The vibrators can be operated with 3/2- or 2/2-way valves. The filter regulator can be used to
set the operating pressure desired and thereby the frequency.
1.
Mount the vibrators with two fastening screws and self-locking washers on a clean and
flat surface (flatness of ±0.1 mm). Netter Vibration recommends placing the vibrators on
a reinforcement profile (U-profile or suitable console). Weld the reinforcement profile to
the mounting surface provided by the customer so that the vibration energy is optimally
distributed.
Lubricate the screws with a suitable assembly paste.
Observe the recommended values for screw sizes and tightening torques.
Mounting on U-profile
Mounting on weld-on console
2.
Mount the maintenance unit (filter, regulator), valve and supply line. Observe the mini-
mum cross-sections for valves and hoses.
Transport
conditions
Storage
conditions
Standard
installation

7
3.
Fasten the compressed air supply. The air inlet has a smaller opening than the air outlet.
Both are indicated by arrows on the front.
Air resistance increases with hose lengh. The nominal widths given above apply to hose
lengths up to 3 m. Longer lines require larger cross sections.
The escaping air can be discharged via a hose. If the vibrator is to achieve full output,
the exhaust air hose must have a larger nominal diameter than the supply hose. The use
of the supplied silencer is mandatory. The silencer must be mounted at the free end.
Rainwater or any other liquid must not enter the housing when using outdoors. Is there a
risk that e.g. Rainwater runs into the housing through the air outlet, the exhaust air must
be discharged through a hose bent downwards.
4.
For critical installation situations secure the vibrators against falling by means of a safety
cable.
7 Start-up and operation
Observe the safety instructions in chap. Safety, from page 3 on.
Please refer to chap. Technical data, page 4 for permissible operating
conditions.
Set frequency
Set the centrifugal force or frequency required with an upstream pressure regulator. For this
purpose, slowly increase the pressure from approx. 1.5 bar to the required or necessary cen-
trifugal force.
The maximum permissible frequency or maximum permissible operating pressure must not
be exceeded. The frequency can be measured with a Vibro Scanner or sirometer (optionally
available from Netter Vibration).
After 30 minutes operating time: check if the initial frequency is still set. Adjust the frequency if
required.
Frequency / bearing life NCT
NCT 1 and NCT 2: Due to high efficiency they reach very high frequencies. The high fre-
quencies reduce the bearing life and increase the sound level. Therefore, Netter Vibration
recommends operating the NCT 1 and NCT 2 only at 2-3 bar or only in interval operation.
NCT: operation in liquids
The operation of NCT in liquids requires the discharge of the compressed air into the atmos-
phere.
Permissible
operating
conditions

8
8 Maintenance and servicing
Observe the safety instructions in chap. Safety, from page 3 on.
Clean the surface of the vibrators regularly with a moist cloth to remove
dust deposits.
To clean the vibrators with pressurised water, proceed as follows:
1. Unscrew the silencer and close the exhaust air opening.
2. Clean the vibrators externally with pressurised water.
3. Mount the silencer.
4. Activate the vibrators briefly.
Damaged or worn bearings may be replaced by Netter Vibration.
Maintenance plan
Interval
Action
After an hour of operation
after initial start-up
Check fastening screws.*
Check hose screw connections and hose connections and retighten, if necessary.
Monthly
Check fastening screws.*
Check hose screw connections and hose connections and retighten, if necessary.
Check hose supply lines for permeability and kinking. If necessary, clean and re-
move kinks.
Check the function of the silencer. Replace it if necessary. A clogged silencer caus-
es a loss of performance. In extreme cases it can lead to the complete failure of the
vibrators.
Check frequencies and set, if necessary.
Empty filter of maintenance unit, if necessary. Clean (wash out) filter element and
replace, if necessary.
Check the function of the mist lubricator. Refill oil if necessary.
If necessary
Clean vibrators.
* Observe the tightening torques (see chap. Technical data, from page 4 on).
Maintenance intervals
The maintenance intervals depend essentially on the service life and how clean the drive me-
dium is. Unfiltered compressed air leads to high wear, silencer clogging or complete failure of
the vibrators.
Cleaning
Bearings
(NCT)

9
9 Troubleshooting
Observe the safety instructions in chap. Safety, from page 3 on.
Malfunction
Possible cause
Corrective action
Vibrator has too little power
or does not start
Connections switched
Place the air inlet on the connection with the smaller bore
(see arrows).
Dimensioning
Check size of the vibrator. Is the size correct?
Pressure too low
Check pressure in front of Vibrator.
Nominal width of hoses and valves observed?
Lines kinked?
Silencer clogged
Clean or replace silencer.
Power loss
Pressure on vibrator
Set operation pressure.
Caution: Observe max. frequency.
Air line kinked
Connect the compressed air supply line without kinks.
Leakage in air line
Replace the compressed air supply line.
Silencer clogged
Clean or replace silencer.
Wear, pollution
Have vibrator checked by Netter Vibration.
Only NCT:
Significant power loss, loud
noise from bearings
Damage to bearings
Have NCT checked by Netter Vibration.
Unusual rise in sound level
after prolonged operating
time
Loose construction
parts or screws (rat-
tling)
Secure loose parts, tighten screws.
10 Disposal
All parts of the vibrators must be properly disposed of according to the material specifications.
The vibrators can be properly disposed by Netter Vibration. The valid disposal prices are available on
request.
Material specifications
Material
Part
Aluminium
housing / NCT: turbine, bearing cover / NCR: cover
Steel, galvanised
Screws / NCB: steel ball, ball race, pin and cover
NCR: steel roller and inner ring
Tungsten alloy
NCT: unbalances
Plastics
Silencer, hose grommet
NCB: o-ring
Stainless steel (for NCT S)
housing, bearing cover, grommet
Sintered metal (for HT versions)
silencer
Brass (for HT versions)
hose grommet