Minor Problems: Causes And Solutions; Possible Cause; Disposing Of Motor Pumps; Electrical Connection - Zenit MAI Manual De Uso

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

Connect the yellow-green lead to earth and supply the leads on the motor pump fas follows: BLACK lead to a line connector; blue lead to the other
line connector or to capacitor\circuit breaker; BROWN lead to the other capacitor\circuit breaker connector.
SINGLE-PHASE electrical connection fig. 1

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. 2-3-4

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.

8.4 CONDUCTIVITY PROBES

Where present the conductivity probe is inserted in the oil chamber and connected to the motor pump output lead labelled S. The probe 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 (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 any two phases
identify the cause of the trouble and remove it
contact your nearest Zenit dealer
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SOLUTION