Introduction; Installation And Connections; General Warnings - Installation And Connection Environments - Carel MasterCella compact Manual De Utilización

Introduction

MasterCella is a control for static or ventilated refrigerated units. It manages all devices: compressors, fans,
defrost, alarms and lights. The enclosure is IP65 and cable connection is extremely easy thanks to an easly
removable front cover. MasterCella belongs to a range of controls able to meet customer requests.
Thanks to the chosen case, the MasterCell can be both panel-mounted and wall-mounted.

1. Installation and connections

1.1 General warnings – installation and connection environments
The following conditions represent the correct installation:
1. avoid installing the instrument in environments featuring: wide and rapid fluctuations in ambient temperature,
relative humidity over 80%, exposure to direct jets of pressurised water, high levels of electromagnetic
and/or radio-frequency interference (e.g. transmitting antennae);
2. use cable terminals that are suitable for the terminals being used. Loosen each screw and insert the
cable ends, then tighten the screws. Once this operation has been completed, lightly tug the cables to
check that they are sufficiently tight;
3. separate as much as possible the probe and digital input cables from cables carrying inductive
loads and power cables, to avoid any electromagnetic disturbance. Never lay power cables and probe
cables in the same channels (including those for the electrical cables). Do not install the probe cables in
the immediate vicinity of power devices (contactors, thermal overload switches or the like);
4. reduce the path of the sensor cables as much as possible and avoid laying spiral paths around power
devices. To extend the probe cables, use cables with a minimum cross-section of at least 0.5mm
5. the cables to be connected to the contacts of the controller must be resistant to the maximum operating
temperature, determined by summing the maximum ambient temperature envisaged to the heat produced
by the controller equal to 20°C;
6. a 50mAT, 250Vac slow-blow fuse must be fitted upstream of the power supply to the controller;
7. protect the power supply to the loads connected to the controller (compressor, defrost, fan, etc..) using
suitable devices (thermal-magnetic overload switch/switches), rated according to the corresponding loads
connected.
Advertency. Safety information.
Before any servicing on the card disconnect power supply from the card in order to safeguard the personnel
against injury and the card itself against damages.
Electrical damage on electronic components usually occurs because of electrostatic discharges caused by
the operator.
Therefore, when handling these components, you must
refer to the following:
• before using any electronic component or card, touch a
grounding (it is not sufficient not to touch, because a
10000V discharge, a very easy voltage value to reach
with static electricity, produces an electric arc of about 1cm);
• the components must be kept inside their original package
as long as possible. If necessary, take the main board
from a package and put it into an antistatic package
without touching the back of the board with your hands;
• absolutely avoid non-antistatic plastic bags or sponge
and polystyrene;
• do not hand in the card directly to other among operators
(to avoid any electrostatic induction and discharges).
Retro / Rear
Guarnizione
Gasket
23
2 ;
Frontale / Front
Fig. 1.1.1