Table of Contents
Advertisement
3.1 General installation instructions
3.1.1
Installation procedure
Environmental conditions
Avoid assembling the pRack PR300T and the terminal in environments with
the following characteristics:
•
temperature and humidity that do not conform to the rated operating
data of the product;
•
strong vibrations or knocks;
•
exposure to aggressive and polluting atmospheres(e.g.: sulphur and
ammonia fumes, saline mist, smoke) so as to avoid corrosion and/or
oxidation;
•
strong magnetic and/or radio frequency interference (therefore avoid
installing the units near transmitting antennae);
•
exposure of the pRack PR300T to direct sunlight and to the elements
in general;
•
large and rapid fl uctuations in the room temperature;
•
environments containing explosives or mixes of fl ammable gases;
•
exposure to dust (formation of corrosive patina with possible oxidation
and reduction of insulation).
Positioning the instrument inside the panel
The position of the instrument in the electrical cabinet must be chosen
so as to guarantee correct physical separation of the instrument from
the power components (solenoids, contactors, actuators, inverters, ...)
and the connected cables. Proximity to such devices/cables may create
random malfunctions that are not immediately evident.
The structure of the panel must allow the correct fl ow of cooling air.
3.1.2
Wiring procedure
When laying the wiring, "physically " separate the power part from the
control part. The proximity of these two sets of wires will, in most cases,
cause problems of induced disturbance or, over time, malfunctions or
damage to the components. The ideal solution is to house these two
circuits in two separate cabinets. Sometimes this is not possible, and
therefore the power part and the control part must be installed inside the
same panel. For the control Signals, it is recommended to use shielded
cables with twisted wires.
If the control cables have to cross over the power cables, the intersections
must be as near as possible to 90 degrees, always avoiding running the
control cables parallel to the power cables.
•
Use cable ends suitable for the corresponding terminals. Loosen
each screw and insert the cable ends, then tighten the screws. When
the operation is completed, slightly tug the cables to check they are
suffi ciently tight;
•
separate as much as possible the sensor Signal, digital input and serial
line cables from the cables carrying inductive loads and power cables
to avoid possible electromagnetic disturbance. Never insert power
cables (including the electrical cables) and probe Signal cables in
the same conduits. Do not install the sensor cables in the immediate
vicinity of power devices (contactors, circuit breakers or similar);
•
reduce the path of the sensor cables as much as possible, and avoid
spiral paths that enclose power devices;
•
avoid touching or nearly touching the electronic components fi tted
on the boards to avoid electrostatic discharges (extremely damaging)
from the operator to the components;
•
if the power transformer secondary is earthed, check that the earth
wire corresponds to the wire that runs to the controller and enters
terminal G0; this applies to all the devices connected to the pRack
PR300T;
•
do not secure the cables to the terminals by pressing the screwdriver
with excessive force, to avoid damaging the pRack PR300T;
•
for applications subject to considerable vibrations (1.5 mm pk-pk
10/55 Hz), secure the cables connected to the pRack PR300 around 3
cm from the connectors using clamps;
•
if the product is installed in industrial environments (application of the
EN 61000-6-2 standard) the length of the connections must be less
than 30 m;
Copyright HPL March 2021
INSTALLATION
3.
•
all the very low voltage connections (analogue and 24 Vac/Vdc digital
inputs, analogue outputs, serial bus connections, power supplies)
must have reinforced or double insulation from the mains network;
•
in residential environments, the connection cable between the pRack
PR300T and the terminal must be shielded;
•
there is no limit to the number of cables that can be connected to an
individual terminal. The only limitation concerns the maximum current
crossing each terminal: this must not exceed 8 A;
•
the maximum cross-section of the cable that connected to a terminal
is 2.5 mm
•
the maximum value of the twisting torque to tighten the screw on the
terminal (torque tightening) is 0.6 Nm;
Important:
•
Installation must be performed according to the standards and
legislation in force in the country where the device is used;
•
for safety reasons the equipment must be housed inside an electrical
panel, so that the only accessible part is the display and the keypad;
•
in the event of malfunctions, do not attempt to repair the device, but
rather contact the CAREL service centre;
•
the connector kit also contains the stick-on labels.
3.1.3
The pRack PR300T is installed on a DIN rail. To fasten the unit to the
DIN rail, press it lightly against the rail. The rear tabs will click into place,
locking the unit to the rail. Removing the unit is just as Simple, using a
screwdriver through the release slot to lever and lift the tabs. The tabs are
kept in the locked position by springs.
3.2 Power supply
Power supply to
the pRack PR300T
S, M, D, L (controller
with terminal
connected)
Important:
•
power supplies other than those specifi ed seriously damage the
system;
•
a Class II safety transformer, must be used in the installation to supply
just one pRack PR300T controller, rating 30 VA for pRack Compact and
50 VA for pRack S, M, L;
•
the power supply to the pRack PR300T controller and terminal (or
pRack PR300T controllers and terminals) should be separated from
the power supply to the other electrical devices (contactors and other
electromechanical components) inside the electrical panel;
•
if the power transformer secondary is earthed, check that the earth
wire corresponds to the wire that runs to the controller and enters
terminal G0. This applies to all the devices connected to the pRack
PR300T;
•
a yellow LED indicates that power is connected to the pRack PR300T.
3.3 Connecting the analogue inputs
The analogue inputs on the pRack PR300T can be confi gured for the
most common sensors on the market: 0 to 1 V, 0...10 V, 0...20 mA, 4...20
mA. The diff erent types of sensors for each input can be selected by setting
a parameter on the user terminal.
21
2
(12 AWG);
Anchoring the pRack PR300T
28...36 Vdc +10/-20% or24 Vac +10/-15% 50...60 Hz;
Maximum current P= 15 W (power supply Vdc)
P=40 VA (Vac)
pRack PR300T +0300018EN rel. 1.5 - 02.05.2017
ENG
Page 70 of 169
Tab. 3.a
P4367 Rev 01
Advertisement
Chapters
Table of Contents
