Carel plug-in PJ32C, Руководство пользователя

Страница: 15 / 52

SOXJLQ
Cod. +030221881 rel. 1.0 - 11/02/2000 11
6SHFLDOZDUQLQJV
For the direct connection of the instruments and the layout and checking of the wiring, the following warnings must be carefully
read and the diagrams adhered to; errors in connection can cause danger to the safety of the user and damage the instruments and
connected components. Also remember that the units must be fitted with all the electromechanical safety devices required to ensure
correct operation and the complete safety of the user.
)RUWKH9DFYHUVLRQVLIWKHSRZHUVXSSO\DYDLODEOH
•
LVPDLQVSRZHU, a safety transformer is required (Carel code TRA12VDE01 or TRA12VDE00) to guarantee the double
insulation between the power supply and the low voltage electronics inside. If required, the protective fuse placed in series with
the primary (32 mAT, for code TRA12VDE00) is indispensable. The connection between the transformer and the instrument must
be as short as possible;
•
LVDOUHDG\ORZYROWDJHEXWQRW9DF, a suitably rated adapting transformer must be used: double insulation between
primary and secondary, and suitable surge features on the primary (2000V for applications in industrial environments).
•
LV9DFthe instrument can be powered directly, evaluating the following conditions. The power line must not be connected
to the actuators and must not be near other connections which may cause high intensity disturbance. In case of doubt, and to
guarantee conformity to electromagnetic immunity standards, an insulating transformer, with the characteristics described in the
previous point, is recommended.
If more than one control with a 12Vac power supply is connected to the same transformer, the polarity of the wiring must be
checked, in the sense that each terminal of the transformer must be connected to the same terminal of all the controls. In this case,
conformity to the EMI standards must be evaluated by the manufacturer/installer.
*HQHUDOZDUQLQJV±LQVWDOODWLRQDQGFRQQHFWLRQHQYLURQPHQWV
Avoid mounting the boards in environments with the following characteristics:
•
relative humidity over 90% or presence of condensation;
•
heavy vibrations or knocks;
•
exposure to continuous jets of water;
•
exposure to aggressive and polluting atmospheric agents (e.g.: sulphur and ammonia gases, saline mist, smoke) which may
cause corrosion and/or oxidation;
•
high magnetic and/or radio-frequency interference (thus avoid installation near transmitting antennae);
•
exposure to direct sunlight and atmospheric agents in general;
•
large and rapid fluctuations in ambient temperature;
•
environments where explosives or mixes of inflammable gases are present;
•
exposure to dust (formation of corrosive patina with possible oxidation and reduction of insulation);
These warnings must be
IROORZHG for connection:
•
electrical power supply other than that prescribed may seriously damage the system;
•
use cable ends that are suitable for the terminals. Loosen each screw and insert the cable end, then tighten the screws. On
completing the operation, tug the cables lightly to check they are sufficiently tight;
•
separate the probe signal and digital input cables from inductive loads and power cables as much as possible, to avoid any electromagnetic
disturbance.
1HYHUOD\SRZHUFDEOHVDQGSUREHFDEOHVLQWKHVDPHFDEOHFKDQQHOVLQFOXGLQJWKRVHIRUWKHHOHFWULFDOFDEOHV Do not
install the probe cables in the immediate vicinity of power devices (contactors, thermo-magnetic devices or other);
•
reduce the length of the sensor cables as much as possible, and avoid spirals around power devices. The probes must be
connected using shielded cables (minimum cross-section for each lead: 0.5 mm
2
);
•
the probes can be installed up to a maximum distance of 100m from the control. To extend the distance of the probes, use
cables with a minimum cross-section of 1 mm², shielded where possible. In this case, the shield must be connected to the
common of the probe. Do not earth the other end of the shield (the sensor end);
•
only use IP67 probes as end defrost probes; place the probes with the vertical bulb upwards, so as to assist the drainage of any
condensation. Remember that the thermistor temperature probes (NTC or PTC) have no polarity, so the order of connection of
the ends is not important;
•
avoid direct contact with the internal electronic components.
Wiring diagrams for multiple units, wiring examples for the serial connection of the instruments:
ΠMAIN: mains power supply, 230 or 115Vac;
)LJ