Espa Multi VX Series, Instruction Manual, Page: 18 / 72

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7.3 Motor/Pump Coupling 7.3 Motor/Pump Coupling 7.3 Motor/Pump Coupling 7.3 Motor/Pump Coupling
The pump may be supplied without the electric motor. In this case the calibrated fork-shaped shim is already inserted between the adapter and the
transmission coupling in order to keep the impeller stack in the correct axial position. To prevent damage during transportation, the pump shaft is held in
position by Styrofoam and two plastic straps. The bolts and nuts needed to fasten the motor to the adaptor are not included.
Use dynamically balanced motors (IEC 60034-14) and with normal vibration rate (N).
Refer to the diagrams in sections 11.18 to 11.20 to couple the pump to the motor.
7.4 Replacing the Motor
7.4 Replacing the Motor 7.4 Replacing the Motor 7.4 Replacing the Motor
Refer to the diagrams in sections 11.18 to 11.21.
If the calibrated fork-shaped shim is not available, use a 1
±
0.1 mm shim.
7.5 Mechanical Seals
7.5 Mechanical Seals 7.5 Mechanical Seals
7.5 Mechanical Seals
Pumps
Pumps Pumps
Pumps Basic characteristics of the mechanical seals
Basic characteristics of the mechanical seals Basic characteristics of the mechanical seals
Basic characteristics of the mechanical seals
Multi VX 1, 3, 5 Nominal diameter 16 mm, unbalanced, right-hand rotation, K version (EN 12756)
Multi VX 10, 15, 20 Nominal diameter 20 mm, balanced, right-hand rotation, K version (EN 12756)
Refer to the diagrams in section 11.22.
7.6 Service
7.6 Service 7.6 Service
7.6 Service
Please contact our Sales and Service Department for any requests or information.
7.7 Spare Parts
7.7 Spare Parts 7.7 Spare Parts 7.7 Spare Parts
Always specify the exact pump/electric pump type and identification code when requesting technical information or spare parts from our Sales and
Service department.
Use only original spare parts to replace any worn or faulty components. The use of unsuitable spare parts may cause malfunctions, damage and
injuries.
Refer to the diagrams in section 11.24.
8. Troubleshooting
8. Troubleshooting 8. Troubleshooting
8. Troubleshooting
Information for users and maintenance personnel Information for users and maintenance personnel Information for users and maintenance personnel Information for users and maintenance personnel
PROBLEM
PROBLEM PROBLEM
PROBLEM PROBABLE CAUSE
PROBABLE CAUSE PROBABLE CAUSE
PROBABLE CAUSE POSSIBLE SOLUTION
POSSIBLE SOLUTION POSSIBLE SOLUTION
POSSIBLE SOLUTION
The electric pump does not start. No power supply Restore the power supply
The main switch is on Triggering of thermal protector incorporated in
the pump (if any) Wait for the pump motor to cool down
Triggering of thermal relay or motor protector
found in the electric control panel Reset the thermal protector
Pump or auxiliary circuits protection fuses
blown Replace fuses
Triggering of protection device against dry
running Check the water level in the tank or the water
system pressure. If everything is in order,
check the protection device and its connection
cables
The electric pump starts up but the thermal
protector is immediately triggered or the fuses
blow Power supply cable is damaged Check the components and replace as
necessary
Electric motor short circuit
Thermal protector or fuses not suited to the
motor current
Motor overload
Check the operating conditions of the electric
pump and reset the protection
The electric pump starts up but, after a short
time, the thermal protector is triggered or the
fuses blow A phase in the power supply is missing Check the power supply
Power supply voltage not within the motor’s
working limits Check the operating conditions of the electric
pump
The electric panel is situated in an excessively
heated area or is exposed to direct sunlight Protect the panel from heat sources and from
the sun
The electric pump starts up but, after a varying
period of time, the thermal protector is
triggered There are foreign bodies inside the pump, the
impellers are jammed Disassemble and clean the pump
The pump’s delivery rate is higher than the
limit specified on the rating plate Partially close the on-off valve located
downstream until the delivery rate returns to
within the specified limits
The pump is overloaded because it is sucking
dense and viscous liquid Check the actual power requirements based
characteristics of the pumped liquid, and
replace the motor accordingly
Worn motor bearings Replace the bearings or the motor