Minor Problems: Causes And Solutions; Disposing Of Electric Pumps; Electrical Connections; Single-Phase Electrical Connection - Zenit MAI Manual De Uso

6 . MINOR PROBLEMS: CAUSES AND SOLUTIONS

FAULTS
motor does not run
motor functions normally but no
water is pumped
pump has reduced flow rate
thermal protector has been
triggered

7 . DISPOSING OF ELECTRIC PUMPS

In the event that is not considered economically viable to repair a worn or damaged electric pump, this must be disposed of in full
compliance with local regulations. To dispose of an electric pump, proceed as follows:
- remove any oil in the chamber and dispose of at a specialised collection centre;
- separate the plastic and rubber parts and dispose of at a specialised collection centre;
- arrange for the metal parts to be scrapped.
Do not dispose of any motor pump component in the environment.
8

ELECTRICAL CONNECTIONS

The device must be wired up in compliance with the plant engineering regulations in force in the area in which the operation is
carried out.
In case of direct connection of the pump to the feeding line it is necessary to install upstream of this a magnetothermal – differential
switch. The functionality and the electric security of Zenit pumps are guaranteed for the configuration provided by the factory, so any
modification (i.e. addition of a piece of cable to that provided by Zenit) can cause the loss of the characteristics of the pump.

8.1 SINGLE-PHASE ELECTRICAL CONNECTION

Connect the yellow-green lead to earth and supply the leads on the electric pump as follows: BLACK lead to a line end; BLUE lead
to the other line end and to condenser\circuit breaker; BROWN lead to the other end of the condenser\circuit breaker. SINGLE-
PHASE electrical connection fig.3.

8.2 THREE-PHASE ELECTRICAL CONNECTION

Connect the yellow-green lead to earth and supply the electric pump output leads. If the electric pump has 3 leads, they must be
connected to a three-phase line with voltage and frequency equal to that indicated on the data plate, or to a control panel with
devices to reduce the initial current. If the electric pump has 6 leads, they must be connected to a control panel with a Y/delta
switching device. If the connection is made directly to the delta, the supply voltage is the lower of those indicated on the data plate;
if the connection is made to the Y, the voltage is the higher of those indicated on the data plate. The supply leads are marked as
follows:
- 3 leads U – V – W;
- 6 leads U1 – U2 – V1 – V2 – W1 – W2;
THREE-PHASE electrical connection fig. 3/a.

8.3 THERMAL PROBES

Thermal protection is incorporated in the motors and resets automatically in the single-phase and in the three-phase versions
equipped with thermistors or remote control switches. In the three-phase versions without remote control switches the thermal
protection, where present, is connected to the electric pump outlet leads labelled T. The thermal protection must be connected to
the corresponding terminal on the electric panel.

8.4 CONDUCTIVITY PROBES

Where present, the conductivity probe is inserted in the oil chamber and connected to the electric pump output lead labelled S. The
probe must be connected to the corresponding terminal on the electric panel.
POSSIBLE CAUSE
no voltage
automatic switch tripped
rotor jammed
thermal protection triggered
check valve jammed
blocked pipe
rotor, valve or pipes obstructed
liquid level too low
incorrect supply voltage
wrong rotation direction (three-phase motor)
rotor jammed
liquid temperature too high
check the power supply line
reset the switch and establish the cause
identify the cause of the trouble and remove it
resets automatically (not on -EX versions)
clean the valve and check its operation
identify the obstruction and remove it
identify the obstruction and remove it
turn the pump off immediately
match the voltage to the values indicated on the
data plate
invert phases
identify the cause of the trouble and remove it
contact your nearest ZENIT dealer
18
SOLUTION