BEKA BA377NE, Руководство пользователя

Страница: 13 / 47

13
Fig 8 Installation procedure
4.3 Timer or Clock earthing
The BA377NE has an M4 earth stud on the rear
panel which should be electrically connected to the
panel enclosure in which the Timer or Clock is
mounted, or to the plant equipotential conductor.
4.4 EMC
The BA377NE complies with the requirements of the
European EMC Directive 2014/30/EU. For specified
immunity all wiring should be in screened twisted
pairs, with the screens earthed in the safe area.
Fig 9 Rear terminals without accessories
4.5 Scale card
The BA377NE's units of measurement are shown on
a printed scale card in a window at the right hand
side of the display. The scale card is mounted on a
flexible strip that is inserted into a slot at the rear of
the instrument as shown in Fig 10. Thus the scale
card can easily be changed without removing the
BA377NE from the panel or opening the instrument
enclosure.
New instruments are supplied with a printed scale
card showing the requested units of measurement, if
this information is not supplied when the instrument
is ordered a blank card will be fitted.
A pack of self-adhesive scale cards printed with
common units of flow measurement is available as
an accessory from BEKA associates.
Custom
printed scale cards can also be supplied - see 5.3
To change a scale card, unclip the tapered end of
the flexible strip at the rear of the instrument by
gently pushing it upwards and pulling it out of the
enclosure.
Peel the existing scale card from the
flexible strip and replace it with a new printed card,
which should be aligned as shown below. Do not fit
a new scale card on top of an existing card.
Install the new scale card by gently pushing the
flexible strip into the slot at the rear of the
instrument, when it reaches the internal end-stop
secure it by pushing the end of the flexible strip
downwards so that the tapered section is held by the
rear panel.
Align the self-adhesive printed scale
card onto the flexible strip and insert
the strip into the instrument as shown
below.
Fig 10 Inserting the flexible strip carrying the scale
card into slot at the rear of the instrument.