Minor Problems: Causes And Solutions; Disposing Of Motor Pumps; Electrical Connection; Single Phase Electric Motor Connection - Zenit DRE Manual De Uso Y Mantenimiento

6. MINOR PROBLEMS: CAUSES AND SOLUTIONS

FAULTS
motor does not turn
motor functions normally
but no water is pumped
pump has reduced flow
rate
thermal protector has cut in

7. DISPOSING OF MOTOR PUMPS

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

8. ELECTRICAL CONNECTION

8.1 SINGLE PHASE ELECTRIC MOTOR CONNECTION

Single phase motor pumps equipped with Shuko plugs are connected by inserting the plug into a suitable electrical
socket. For plugless single phase motor pumps connect the yellow-green lead to earth and supply power to the leads
attached to the motor pump.
SINGLE-PHASE electrical connection (fig. 3)

8.2 THREE PHASE ELECTRICAL CONNECTION

Connect the yellow-green lead to earth and supply the motor pump output leads. If the motor 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 motor 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. 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. 4 - 5)

8.3 THERMAL PROBES

Thermal protection is incorporated in the motors and resets automatically in the single phase versions 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 motor pump outlet leads labelled T. The
thermal protection must be connected to the corresponding terminal on the control panel.
POSSIBLE CAUSE
no voltage
automatic switch tripped
impeller jammed
thermal protection cut in
check valve jammed
blocked pipeline
impeller, valve or pipelines obstructed
liquid level too low
incorrect supply voltage
wrong direction of rotation (three phase motor)
impeller jammed
temperature of liquid too high
check the power supply line
reset the switch and establish the cause
establish the cause of the trouble and
remove it
resets automatically
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 any two phases
identify the cause of the trouble and remove
it
contact your nearest zenit dealer
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SOLUTION