Electrical installation
Principles
24
Stepper motor-driven diaphragm dosing pump NXP-M and NXP-P
Operating instructions
9 Electrical installation
DANGER
Mortal danger from electric shock!
If there is an electrical accident, you must disconnect the dosing pump
from the mains as quickly as possible.
ð
Install an emergency stop switch or integrate the dosing pump into
the plant safety concept.
CAUTION
Danger of automatic start up!
The dosing pump does not have an ON/OFF switch and may start to
pump as soon as it is connected to the mains supply.
ð
Install an emergency stop switch or integrate the dosing pump into
the plant safety concept.
NOTE
Damage due to incorrect mains voltage
The dosing pump can be damaged if you connect it to the wrong
mains voltage.
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Observe the information on the mains supply that is given on the
rating plate.
NOTE
Insufficient electromagnetic compatibility
When you connect the dosing pump to a socket without an attached
protective earth, it is not possible to guarantee the interference
radiation and interference immunity according to EMC regulations.
ð
Only connect the dosing pump to sockets with an attached
protective earth.
9.1 Principles
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The dosing pump has a 110 – 240 V AC 50/60 Hz wide-range power
supply unit.
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The electrical connection comply with local regulations.
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The dosing pump must be plugged into a grounded power outlet.
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To avoid dosing errors at the end of the process, the dosing pump
must be locked electrically.
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The dosing pump must not be operated by switching the mains
voltage on or off.
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Signal cables must not be laid parallel to high-voltage current lines or
mains cables. You must route supply and signal lines in separate
channels. An angle of 90° is required at line crossings.
NOTE
Compromised functions due to open contacts
The dosing pump is supplied with conductive rubber bands installed in
the connection ports 1 (NXP-M) or 1 and 3 (NXP-P). The conductive
rubber bands conduct electricity and ensure that the contacts in the
connection sockets remain closed when no cables are connected. If
the conductive rubber bands in connection sockets are missing or not
correctly installed and there are no cables connected to the sockets, it
is not possible to start the dosing pump.
ð
Insert the conductive rubber bands in connection sockets if you do
not wire up the connection sockets.
ð
Ensure that the conductive rubber bands are installed on the
correct contacts (see instructions in following section).
Fig. 19: Removing the conductive rubber bands