Cuppone Giotto GT110, Pre-Installation And Installation Manual

Page: 33 / 42

Ed. 05421 - 70702561 - REV04 - valid from serial number 21052570 - Giotto - Installation
33
E
4
3
2
S R N T
1
S N R T
2
3
1
S N R T
2
3
2 1
1
Fig. 34.
Fig. 35.
LED
Installation
Fig. 34.
To prevent wrong connections of the power cable, a phase
control relay is installed on the panel
E
; in fact, if during the
installation phase, the neutral cable and one of the phases are
reversed, some components, especially the electronic control
boards, would be powered with a voltage of 400V instead of
230V and might be damaged.
The relay
E
controls the phases cyclically; if the control is:
•
positive the relay LED
E
is fixed and the oven is
turned on (the relay enables an exchange contact that in
turn enables a relay slaved to it).
•
negative the relay LED
E
flashes and the oven is NOT
turned on (the exchange contact is not enabled).
If the oven does not turn on, it is necessary to check the cable
connecting the oven to the customer’s socket.
This check can be done:
•
on the socket
C
going to the oven;
•
on the plug
B
connecting to the power point.
Fig. 35.
Checks to be carried out if the oven does not turn on and the
phase control relay LED
E
is flashing:
1 - check that the neutral cable is correctly connected to the
corresponding terminal (4) of the socket or connector;
2 - if the neutral is connected correctly, swap the position of
two phase cables (e.g. T and r) on the terminals of the system
socket or on those of the connector shown on the side (but
not on both)