Positioning unit SERVO.M_E-P
Data: 01/12/20 file: Servo.M_EP_CS_1.7_ing.doc pg 4/7
Power supply
a) Before connecting the unit, check that the power supply tension is within the permitted limits and that it
corresponds to the one indicated on the tag.
b) Carry out the electrical connections with the instrument disconnected.
c) For the power line to instruments and sensors, a power supply line separate from that of the power is
required : it is necessary to use an isolating transformer.
d) The power line should provide a device that separates the set fuses of the instruments and should not be
used to regulate relays, contactors, etc.
e) If the network tension is very disordered (ex. from the change-over of the power units, motors, inverters,
welders, etc.), use the appropriate filters of the network.
f) If an earth connection is needed, ensure that the plant has a good earth system: tension between neutral
and earth <1V and the resistance <6 Ohm.
Gear motor assembly:
To assemble the unit correctly adhere to the following instructions:
Two M4 screws can be used moreover, that can be screwed in the two brass inserts M4x12 : this is in case
the servo motor has to make many manoeuvres or is used continuously.
The unit is therefore inserted through the hollow shaft of diameter Ø20 millimetre (50mm deep) on the
driving shaft of the machine.
Ensure that the hollow shaft is perpendicular to the support base.
Block the hollow shaft on the machine shaft using the bolt screw M4 on the clamping metal ring.
N.B. = The gear motor does not have parts that need maintenance or oiling.
If necessary, protect the unit from: dust, water, collisions, extreme temperatures.
Manually turn the shaft of the reducer using the clamping ring (tightened on the hollow shaft)
only if necessary.
Do not exceed permitted torque.
Do not dismantle or open the unit, particularly the part of the reducer.
Do not pierce/modify the container or the hollow shaft.
POTENTIOMETRIC VERSION Before assembling the SERVO, it is fundamental to place the shaft of the
machine and the shaft of the SERVO in the correct position, for example half way or towards the end, in a
way that there is correlation between the position of the SERVO and that of the machine. To do that, the
motion of the hollow shaft of the SERVO should be serially commanded by the control unit (PLC, PC, etc):
do not rotate the shaft by hand.
The calculation of the number of turns that the hollow shaft has to finish to develop the total motion of the
machine is determined by multiplying the reduction ratio of the reducer of the potentiometer by the number
of turns of the potentiometer itself (total reduction ratio = R).
In case that the maximum number of allowed rotations by the shaft is exceeded, a mechanical friction
intervenes to safeguard the potentiometer transducer.
NB: the SERVO is provided with the hollow shaft and the potentiometer positioned half way.
ELECTRICAL CONNECTION
Disconnect from power supply before connecting/disconnecting the equipment/machinery.
The connecting cables must be kept separate from the power lines or from electromagnetic
interference sources.
Pay careful attention to the electrical connections: any failure caused by a faulty connection
will render the guarantee null and void.
The power supply must be in the permitted range, a higher range could damage the
equipment.
Remove the 3 closing screws of the cover to access the terminal box.
Slide the cables in the cables press and carry out the connections according to the following figure:
