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MANUAL | VA4J&X | VS4C | VA4C | ATEX certified
MANUAL | VA4J&X | VS4C | VA4C | ATEX certified
Performance regulation
2. Air flow regulation
Air flow regulation is the best way to reduce
the output speed without the loss of torque.
The air flow can be regulated with a throttling
device. By throttling, the starting torque remains
essentially the same but the torque curve is
steeper. This means that under the same load
fluctuation, the speed fluctuation is smaller in
comparison with the pressure regulation. There
is a distinction made between the following
installation positions:
Exhaust air throttling
The exhaust air throttling is the less optimal
way of throttling relating to the durability
and the air consumption. The advantage of
this method is that the rotational speed can
be regulated constantly in the lower rotation
range. In the border area of the rotation range,
a combination of supply- and exhaust air
throttling should be used. The exhaust throttling
should be used for controlling low speed of
rotation.
Supply air throttling
The supply air throttling generates better
results in relation to the durability, the running
smoothness and the air consumption.
With the regulation of the inlet pressure and the flow rate, the performance can be adapted to the
individual application. This is done by pressure or air flow regulation or a combination of both.
The compressibility of the air generates a dampening effect in all ranges. This allows that the motor
also can be started, while it is loaded. With a load reduction, the motor reacts immediately with an
increase in speed.
0
100
120
140
160
180
200
220
240
1
2
3
4
5
6
Rotation speed
Tor
que
0
100
120
140
160
180
200
220
240
1
2
3
4
5
6
Rotation speed
Tor
que
Pressure regulation
Air flow regulation
0
100
120
140
160
180
200
220
240
1
2
3
4
5
6
Rotation speed
Tor
que
0
100
120
140
160
180
200
220
240
1
2
3
4
5
6
Rotation speed
Tor
que
Pressure regulation
Air flow regulation
For optimal power and speed control we advise to use the
combination of pressure and air flow regulation.
Pressure regulation
Air flow regulation
(optional)
Supply air th
rot
tling
Exh
aust air th
rot
tling
1. Pressure regulation
With pressure regulation the output power
can be adjusted. When the supply pressure is
decreased, the torque and power is reduced
proportionally and the torque curve becomes
flatter. The forces inside the motor are also
reduced, which increases its durability.
Maintenance
WARNING - Injury hazard
Wear eye protection: Air stream from product may contain solid or liquid materials that
can result in eye or skin damage.
Failure to follow these instructions can result in serious injury or property damage.
Flush this product in a well ventilated area.
Do not use kerosene or other combustible solvents to flush this product.
Correct maintenance is your responsibility!
Make sure you have the proper maintenance
conditions.
Disconnect air supply and vent all air lines.
»
Please ensure that maintenance is carried out
by certified staff. You can order your service
kit at [email protected].
»
Check intake filter and silencer after the first
100 hours of operation.
»
Clean filters and lubricators and determine
how frequently filters and lubricators should
be checked during future operation. This will
help the motor performances and it’ service
life.
»
Do not open when explosive atmosphere is
present. Sparks induced by tools may cause
an explosion.
»
When performing maintenance on the air mo-
tor please use the rebuild instructions which
are also enclosed in this manual. Please make
sure the motor runs smooth after maintenance
and check the clearances in the motor to pre-
vent problems when operating the motor.
VA4J&X
VS4C
VA4C
2.000 Running hours
6.700 Running hours
6.000 Running hours
»
To comply according to ATEX please change the bearings of the motor according to the table
below:
