JUMO 706581 LOGOSCREEN nt stainless steel front Installation Instructions - Manual (Page 17)

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4 Electrical connection
4.1 Installation notes
A
It is essential to follow the installation notes.
k The instrument is suitable for installation in switch cabinets with at least
a simplified pressurized enclosure. External fuse protection and shut-off
must be provided for the device. The fuse must not exceed 20 A.
An instrument fuse is already built into the device itself (depending on
the device design).
20 — 30V AC/DC, 48 — 63Hz :
fuse 2.5A slow-blow
100 — 240V AC +10/-15%, 48 — 63Hz : fuse 1.25A slow-blow
k The pressure in the switch cabinet must be at least 0.5 mbar higher than
the pressure outside the switch cabinet.
k The choice of cable, the installation and the electrical connection must
conform to the requirements of VDE 0100 “Regulations on the
Installation of Power Circuits with Nominal Voltages below 1000V” or the
appropriate local regulations.
In addition to this, the applicable standards for potentially explosive
atmospheres (gas and dust) must be taken into account.
k Suitable isolation (such as a zener barrier or an Ex transmitter) must be
provided when signal circuits from a potentially explosive atmosphere
are connected to the instrument.
k Work inside the instrument must only be carried out to the extent
described and, like the electrical connection, only by qualified personnel.
k For service and repair work, the device must be disconnected from the
power supply (all poles) and the atmosphere must be free from the risk of
explosion.
k To generate the operating voltage of 20...30 V for Extra Low Voltage
(ELV), the maximum nominal voltage of an external power supply must
not exceed 240 V (line-to-line and line-to-neutral). If the external nominal
voltage is greater than 240 V, an Safety Extra Low Voltage (SELV) power
supply must be used. For line-to-line supply of the external power
supply, the power supply must have all-pole fuse protection. The fuse
must shut off both connections.
k Run input, output and supply cables separately and not parallel to one
another.
k In EMC disturbed environments, all input and output cables without con-
nection to the mains supply must be arranged as twisted and screened
cables. Earth the screen on the instrument side to the earth potential.
k Ground the instrument via the PE terminal of the power supply connec-
tor. The cross-section of this cable must be the same as that of the sup-
ply cable.
k Do not connect any additional loads to the supply terminals of the
instrument.