To Next Page

To Previous Page

en – Translation of the Original Instructions

28 e-SV series – Additional Installation, Operation and Maintenance Instructions

Motor without automatic reset thermal overload protection

1. If the motor is used with full load, then set the value to the nominal current value on the

data plate of the pump unit.

2. If the motor is used with partial load, then set the value of the operating current measured

with a current pincer.

3. For three-phase motors with star-delta starting system, set the thermal relay downstream of

the switching circuit at 58% of the rated or operating current.

4.5.5 Operation with frequency converter

The three-phase motors can be connected to a frequency converter for speed control.

• The converter exposes the insulation of the motor to a greater load, determined by the

length of the connecting cable: observe the requirements of the Manufacturer of the

frequency converter

• For applications requiring silent operation, install an outlet filter between the motor and the

converter; a sinusoidal filter can reduce the noise even further

• The bearings of the motors, from size 315 S/M and up, are exposed to the risk of harmful

currents: use electrically insulated bearings

• The conditions of installation must guarantee protection against voltage peaks between the

terminals and/or dV/dt in the table:

Motor size

Voltage peak, V

dV/dt, V/µs

up to 90R (500 V)

< 650

< 2200

from 90R to 180R

< 1400

< 4600

over 180R

< 1600

< 5200

Otherwise, use a motor with reinforced insulation

and a sinusoidal filter.

Available on request

Xylem LOWARA e-SV Series User Manual

Other manuals for Xylem LOWARA e-SV Series