12
water solutions
Zenit Italia s.r.l.
via dell’Industria, 11 I-41018 S.Cesario s.P. (MO)
MADE IN ITALY
EN 60034-1
T
max
=40°C
zenit.com
water solutions
DGO 50/2/G50H A1CM
NC
TCST
E-SICAL 10
230 V
2.90
For electrical connection, refer to the diagram corresponding to the electric
pump version indicated on the plate
TSCD
First installation manual – Translation of original instructions
3.3 Ground connection
•
Make sure that the ground system and differential security breaker are present and in good working order.
•
Check that the ground conductor is about 150 mm longer than the other conductors so that it will be the last to become disconnected from the
panel in the event of accidental tugs.
The predisposition for the connection of the external earth conductor accepts cables with a cross-sectional area of at least 4 mm².
On -Ex pumps, make sure that an external earth conductor (yellow and green, with cross section at least of 4 mm
2
) is connected
to the external earth terminal on the pump using a secure cable clamp. Clean the surface of the externa earth connection and
mount the cable clamp.
3.4 Thermal protection
The equipment is equipped with thermal protectors inside the stator windings to shut down the power supply in case of motor overheating.
The standard thermal protection consists of bimetal thermal protectors with nominal switching temperature NST=150°C; as option, bimetallic
protectors can be replaced by PTC thermistors or PT100 sensors.
The thermal protection cables are marked with a label stating “PROTEZIONE TERMICA - THERMAL PROTECTION” and must be connected to
the corresponding terminals of the control panel.
The connection of the thermal protectors to a control panel is mandatory.
The electric panel must be predisposed to guarantee
the shutdown of the motor when the thermal protection intervenes and to avoid the automatic start-up of the pump which must
only be started manually with the intervention of an operator.
3.5 Leakage detector
The electric pump can be equipped with a single-electrode leakage detector as an accessory to detect and signal the infiltration of water into the
oil chamber of the mechanical seals (the equipment grounding conductor is used as the return path for the conductive level limit detection).
In the case of detection, take out of service the pump and proceed with maintenance.
The signal cable is marked with a label with the letter
S
.
For installations with -Ex certified models, the connection to the electric control panel must be carried out by inserting in safe
area an Intrinsic Safety barrier with galvanic isolation.
Electrical safety data for intrinsically safe circuit:
Leakage detector
Ui: 30V; Ii: 120mA; Pi: 1.3W
Ci: 0.3nF; Li: ~ 0mH
Cable
Cc: 200pF/m; Lc: 1µH/m; Lc/Rc= 30µH/Ω
3.6 Connection diagrams (standard version)
To set up the electrical connection of the electric pump, do the following:
1. Check which type of electrical connection is required on the identification plate (direct starting or Y/D).
2. Firstly, connect the earth wire to the relative terminal in the electrical panel, according to the connection diagram illustrated.
3. Connect the power wires to the relative terminals in the electrical panel, according to the followings connection diagrams (please refer to the specific
documentation supplied with the unit for electrical connections of non-standard sensors and protective devices).
4. Connect the wires of the control devices to the terminals on the relative panel.
EN
