Sensing and Internet of Things
5
MICRO SWITCH VPX Series
ISSUE F
32312068
used in combination unless permitted by the associated appa-
ratus certification. Control equipment must not use or generate
more than 250 V rms or dc with respect to earth. Where mul-
tiple circuits extend from the same piece of intrinsically safe
equipment to the associated apparatus, they must be installed
in separate cables or in one cable having suitable insulation.
Installation must be done in accordance with all local codes.
,
ATTENTION
The following additional previous editions of Standards noted
under the “Standards” section of this Certificate where ap-
plied to integral Components as itemized below. There are
no significant safety related changes between these previous
editions and the editions noted under the “Standards” sec-
tion.
Inductive Proximity Sensor, Part No. NCB2-V3-N0 manufac-
tured by Fuchs GmbH
IEC 60079-0:2004, IEC 60079-11:2006
INSTALLATION INSTRUCTIONS
1.
DO NOT OPEN
the VPX when energized or in a flammable
atmosphere.
2. Mount VPX using (4) M6 x 1 screws or (4) M8 x 1.25 screws
into the tapped holes at the base of the product. Mount-
ing dimension drawings for the hole locations are shown
in Figure 17. Fasten M6 screws to 18 Nm ±2 Nm [13.3 ft-lb
±1.5 ft-lb]. Fasten M8 screws to 6 Nm ±1 Nm [53 in-lb ±9
in-lb]. Accessory brackets are available that mate directly
to the base of the VPX. Proper alignment of the shaft of the
VPX to the mating valve actuator or coupling is essential in
order to ensure smooth rotary motion of the VPX shaft as
well as to avoid premature wear.
3. After mounting the VPX, remove the (4) socket head cap
screws that fasten the cover to the base using a 6 mm hex
wrench.
4. Remove the cover and refer to circuit diagram on the inside
of the cover, or refer to document 32325422. The diagram
depicts the available connections of each switch inside the
VPX. A terminal strip is labeled for each switch connection.
Figure 4. Circuit Diagram Location
Figure 5. Terminal Strip Location
Terminal strip
connections
5. For installations utilizing the UL or cUL certifications, use
Class I, Division 1, Class II, Division 1, and Class III wiring
methods in accordance with the National Electrical Code
(NEC), Canadian Electrical Code (CEC), or other code(s)
where applicable. For installations utilizing the ATEX/IEC
Ex certifications, use applicable requirements from EN/IEC
60079-14, EN/IEC 60079-17, and EN/IEC 60079-19 as
required by local codes and regulations.
Figure 6. Conduit Size ID Locations
Conduit thread identification locations
6. Insert the wires through the conduit openings so that they
are accessible inside the VPX. Ensure enough wire is avail-
able to reach each terminal strip location.
7. Wire should be stripped back to 4 mm ±1 mm [0.16 in
±0.04 in]. Wire sizes should be chosen to comply with local
codes and practices and capable of carrying the rated load.
The terminal strip will accept 0,1 mm
2
to 4 mm
2
[26-12 AWG] wire. Insert the stripped ends of the wire to
each connection and tighten the screws to 0,4 Nm ±0,1 Nm
[3.5 in-lb ±1 in-lb].
8. Ground screws are located both inside and outside the
enclosure, suitable for wire sizes up to 4 mm
2
[12 AWG].
Fasten all M4 grounding screws to 1,6 Nm ±0,3 Nm
[14 in-lb ±2.7 in-lb]. The internal grounding terminal must
be used for the equipment grounding connection and the
external terminal is for supplementary bonding connec-
tion where local codes or authorities permit or require such
connections. See Figure 7.
