Digitro 4000 Series Betriebsanleitung - Seite 2

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HYSTERESIS
(MODELS 4801, 4804)
The hysteresis is factory preset to ±2 counts. It should only be adjusted
by qualified and trained staff, and using a small insulated screwdriver as
indicated in Figure 1.
It should not be carried out while the instrument is powered up.
Hysteresis may be adjusted by ±1 count up to ±10 counts.
PANEL FITTING
The instrument is designed to fit in a panel cut out measuring 92 x 45mm.
The panel should be between 1.5 and 3.5mm thick.
The instrument is fitted by sliding into the aperture and pressing firmly
home into position.
REMOVAL
Before the instrument can be removed from the panel, the connectors
must
be unplugged from the rear of the panel.
1.
Ensure that the power is disconnected.
2.
Remove the front window by gently levering with a small screwdriver
on the slot on the lower edge of the window.
3.
Use a screwdriver to release the clamping arms by slightly bending
back the lugs as shown below, whilst gently pulling the instrument
forward.
REMOVAL OF PCB FROM CASE
Follow instructions for removal. Tap instrument (face down) into the palm
of the hand. If it does not slide out it can be pushed out by gentle
pressure from the rear on the terminal pins. Do
not
use a screwdriver to
prise out the PCB.
WIRING
All connections should be made using the supplied terminal plugs only,
and these slide on to the appropriate terminal pins. Detailed connections
are given on the rear of the instrument and these drawings should be
used in conjunction with the following instructions.
Note:
When refitting the plugs, ensue that this is done correctly.
ALARMS
(MODELS 4801, 4804)
These models have a relay fitted and the alarm point can be adjusted
from the front panel.
SET POINT ADJUSTMENT
Hold in the set point button and adjust the set point potentiometer for the
required number of counts as indicated by the display.
RELAY CONNECTIONS
These instruments have a control relay with a rating of 5A at 250V a.c.,
and 30V d.c. for resistive loads.
Connection is shown on the rear label and should be made using the
supplied terminal block.
These ratings should not be exceeded and an external contactor should
be used for high power or 3 phase requirements.
When relay is not energised:
N.C. = Normally Closed
COM = Common
N.C
COM N.O.
.
N.O. = Normally Open
NB: The rear cover should always be fitted.
PLATINUM RESISTANCE SENSORS
(MODELS 4504, 4804)
The sensor should be connected to the instrument using a four core
copper cable as shown below:
4504/4804
Pt100
A B C D
Standard Pt100 sensor identification colours:
Yellow
A
Red
C
Black
B
Blue
D
USING 3 WIRE SENSORS
These should be connected as per the 2 wire sensors, but with terminal
A+B and C+D linked.
A
B C D
Thermocouple
THERMOCOUPLES
(MODELS 4501, 4801)
Thermocouples should, if possible, be wired directly into the terminal
block taking care to observe the correct polarity.
4501/4801
+ve
-ve
If the thermocouple has to be extended, this should only be carried out by
using extension or compensating cable of a type appropriate to the
thermocouple being used.
NOTE:
The accuracy may be affected by cable lengths. This is also
affected by the type of cable.