Weidmuller LPD450F Operating Instructions Manual

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Bedienungsanleitung

Eigensichere 4 ½-stellige Digital-Anzeige
für Feldmontage 3

en

Operating instructions

Inherently safe 4 ½-digit digital display for
field installation 10

LPD450F 61001054/00/01.08

en

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LPD450F

• Operation

General

The LPD450F is a field mount, 4+1/2 Digit, LCD Indicator for 4-20 mA
signals.

Loop powered operation

The LPD450F draws its’ power from the 4-20 mA signal current,
resulting in a voltage drop across the unit. The voltage drop
(2.5 V @ 20 mA) is equivalent to an increase in loop load of 125 Ω.

Cleaning

The case can be wiped with a damp cloth. De-energise the unit before
cleaning.

Using the peak and valley hold feature

To see the highest displayed value, hold down the ì key.
To see the lowest displayed value, hold down the Å ke y.
To reset either value, press P while it is on display.
Peak and Valley values are not stored when the instrument is switched

off.

Reviewing the set-up

To review the set-up, press the P key (run select switch must be in the
“normal” position). Press the Å key to scroll through the settings. A ten
second timeout applies.

Symbols

– Documentation must be consulted in all cases where this symbol

is used.

• Installation

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Caution: In order to meet product safety requirements, these units must
only be installed, by qualified staff, in accordance with the information
given in this manual, and all relevant national electrical wiring and
safety rules must be followed.

Industrial signals are frequently floating with respect to local earth,
so take care while connecting the signal wires. The LPD450F is not
intended to be connected to signals floating above 300 Vrms with
respect to local earth.

Location and mounting

Locate the instrument in an area that is free from dust, moisture and
corrosive gases.

The standard mounting method uses four 4 mm screws through

he housing. Mounting hole spacings are 120 x 60 mm. Remove the

t
front cover to gain access to the holes. Note: do not drill holes in the
enclosure as this will compromise the IP67 rating.

The optional pipe mount bracket can be attached to suit fitting to a
50 mm pipe. See below for assembly.

Access to instrument terminals

1. Remove the transparent front cover.

2. Release the thumbscrews from the either side of the LCD display.

3. Lift the electronics from the housing using the thumbscrews.
The connections for the instrument are on the underside of the

electronics and are marked for polarity. Use a suitable crimp lug for
connections.