2
Note:
The manufacturer of this equipment has a policy of continual product improvement and
reserves the right to change the specification of the equipment and the contents of this manual with-
out
These mounting and operating instructions are intended to give the knowledge which is necessary to
carry out the mounting and adjustment of NX20servo motor safely and correctly.
Please read these instructions through carefully and pay particular attention to the advice and warn-
ings.
The NX20 servo motor has an output torque of 20Nm/15lb.ft. with an actuating time of 30 seconds
for 90degrees rotation. Two end travel limit microswitches with adjustment cams and a potentiome-
ter directly coupled to the output shaft are enclosed within its housing.
The output drive shaft can execute a rotation angle of 270 degrees maximum.
Two types of servo motors, 115 and 230 Volt AC, are available.
The field of use of this servo motor is predominantly for fuel valve and air damper actuation on
industrial burners.
SAFETY ADVICE
Device Safety
The servo motor must be used only for purposes corresponding to its construction and within the val-
ues specified in the technical data.
If current is applied simultaneously, to the terminals for open and close (Fig 3), uncontrollable move-
ment of the output drive shaft may occur, depending on the load on the shaft. This situation must be
prevented by the user by an electric interlock in the drive controller.
The installer should be satisfied that, as a result of the mounting, the commissioning or as a result of
the test adjustments on the actuator, no potential hazards will be produced for devices/machines/
plant.
Before mounting the servo motor, check the free movement of the valve/device.
After completing the mounting and adjustment, check the correct functioning of the servo motor.
Safety advice for mounting and adjustments
The Installer must be satisfied that, as a result of the commissioning or the test adjustments on the
servo motor, no potential hazards will be produced for personnel or the environment.
After completing adjustments check the correct functioning of the servo motor.
Check the functioning of the end position switches.
Check the correct functioning of any safety devices.
Carry out adjustments only in accordance with the instructions described in this documentation.
When adjustments are being carried out on an opened and switched-on servo motor there is the risk
that live parts can be touched.
Adjustments must therefore be carried out only by an electrician or a person having adequate train-
ing, who is aware of potential hazards.
Содержание NEXUS NX20-1
Страница 7: ...7 FIGURE 4 DIMENSIONS NX20 SERVO MOTOR...
