21
Heez +050002745 rel. 1.2 - 16.11.2021
ENG
3.7 Electrical
connections
For installation proceed as described below, with reference to the general connection diagram (see the following
paragraph). Each terminal on Heez can be connected to different models of connectors, with retaining catches
integrated into the plastic cover. The complete list of connectors is available in the chapter “Technical specifications”.
Caution:
•
separate as much as possible the probe and digital input cables from cables to inductive loads and power cables,
so as to avoid possible electromagnetic disturbance. Never run power cables (including the electrical panel cables)
and probe signal cables in the same conduits;
•
the cables must be sized as described in table of Technical specifications;
•
do not install the cables connected to the controller terminal block in the immediate vicinity of power devices
(contactors, circuit breakers, etc.). Reduce the path of cables as much as possible, and avoid spiral paths that
enclose power devices.
•
the power supply earth must be connected directly to the controller, without branches to other devices; the cross-
section of the earth wire must be greater than or equal to the cross-section of the phase wires; earth impedance
must be compliant with national and local regulations.
Power suppl
y
Use cables rated for temperatures up to 105°C. Use suitable terminals for the connectors and cables used. Insert the
connectors into the housings provided and fix them in place using the retaining catches. Then lightly tug the cables
to check correct tightness.
50002730_015_R01
U
V
W
L
N
J
2
J
1
U
V
W
PE
PE L N
bottle cooler
Fig. 3.n
The controller must be earthed: the spade terminal provided can be used for this purpose. To minimise EMC problems
it is recommended to use a power cable that includes an earth wire, connected to the terminal
. The power supply
earth must be connected directly to the earth bar in the electrical panel, without branches to other devices; the cross-
