Weidmuller LPD450F User manual
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Bedienungsanleitung
Eigensichere 4 ½-stellige Digital-Anzeige
für Feldmontage 3
Operating instructions
Inherently safe 4 ½-digit digital display for
field installation 10
LPD450F 61001054/00/01.08
en 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 key.
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
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
the housing. Mounting hole spacings are 120 x 60 mm. Remove the
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.
Connections
Strip wires to 7 mm from the ends. Use a suitable ferrule for
multistranded wires (do not solder).
Use 12-28 AWG Cu Wire rated for temperatures above 70 °C Only,
tighten to 4.5 lb-In.
For effective protection from electromagnetic noise, all signal cables
must be shielded, or located on conductive trays or in conduits.
The gland supplied suits a single sheath cable with diameter in the
range 8 to 10 mm. Other cable sizes will require a different gland.
Pipe mount bracket assembly
Curve suitable for fixed input interval breakpoint linearisation.
11 point
Display Value/Measurement
Input Current mA 20 mA
• Setup
Changing the set-up
1. Move run mode switch to the upper ‘calibrate/set-up’ position.
2.Press the P key.
See table below for details.
Setup Sequence
Setting Display Description Åì P
S/W Version v1.01 S/W Version (Note: this table applies to versions 1.00 to 1.09 only)
Mode SetP
CALb
Select for setup mode
Select for calibrate mode Toggle Accept
Damping factor dF=
2
Introduces the damping factor
Value, e.g., 2
-
Dec
-
Inc
Next
Accept
Transfer
function
FnC=
LInr
Srt
1oo1.5
1oo2.5
CurU
Introduces the transfer function
Linear
Square root
x1.5
x2.5
Breakpoint linearisation
-
Next
Next
Next
Next
Next
-
Accept
Accept
Breakpoint
linearistion
display
setup
nP=
5
Introduces the number of breakpoints
e.g., 5 (breakpoints at 4, 8, 12, 16 and 20 mA)
-
Dec
-
Inc
Next
Accept
dp=
.
Introduces the display decimal point position
(max 3 places or nOdp for none)
-
Shift
Next
Accept
y1=
10.000
Introduces the first breakpoint’s display value
e.g., 10.000
-
Dec
-
Inc
Next
Accept
-Set display values for each breakpoint
Normal display
setup
dP=
.
Introduces the display decimal point position
(max 3 places or nOdp for none)
-
Shift
Next
Accept
dLO=
0.0
Display range lower limit
e.g., 0.0
-
Dec
-
Inc
Next
Accept
dHI=
100.0
Display range Upper limit
e.g., 100.0
-
Dec
-
Inc
Next
Accept
Save values SAVE Instrument is saving the changes to the setup and returning to normal
operation
Breakpoint linearisation
Breakpoint linearisation gives a display of the measurement from non-
linear signals by breaking the curve up into a number of segments.
The breakpoints are spread evenly throughout the input range. So, for
example, if you set up a unit for nine breakpoints you will have to set
display values for 4, 6, 8, 10, 12, 14, 16, 18 and 20 mA.
Switch positions (shown in correct position for installation).
P
Mann Series LPD450F
• Calibration
General
The LPD450F is factory calibrated. You should not have to recalibrate the
unit before installation.
Allow the instrument 15 minutes of powered operation (to reach a
stable temperature) before calibration. During calibration allow a few
seconds for signals to stabilise before accepting the value.
Equipment requirements
•A suitable 4-20 mA current source
Input calibration procedure
When the display shows Action/Description
Connect the current source to the inputs and set to 4.00 mA.
Put the run/calibrate switch in calibrate position, select setup mode.
CALb Press P
CALn Press Å
CALy Press Pthree times
InH= Set the current source to 20.00 mA
Press Pthree times
UPCn Press Å
UPCy Press P
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