Motor Operating Instructions; Fault Finding Chart - Xylem Lowara LSB Série Instructions De Montage

Installation, Operation and Maintenance Instruction

11. Motor Operating Instructions

The following instructions must be followed
exactly, to guarantee the safety at the
installation, at the operation and at the
maintenance of the motor. All persons should
be directed to the present manual which are
performing these tasks. The neglect of the
instructions can
guarantee.
Electrical connections
Make sure that the rated voltage corresponds to
the supply voltage.
Ground the pump before making any other
connection.
We recommend
differential switch (30 mA) be installed as extra
protection against lethal electric shocks in the
event of faulty grounding.
Connect the pump to the mains using a multiple-pole
switch or other device
disconnection (interruption of all the supply wires)
from the mains, with a contact separation of at least 3
mm.
Remove the terminal board cover by first removing the
screws.
Carry out the connections as indicated on the back of
the terminal board cover, and as shown in fig. 3 - 4.
The single-phase version has a built-in overload
protection; the three-phase version must be equipped
by the user with a magneto-thermal switch or
magnetic starter with overload and undervoltage
protection, a thermal relay and fuses installed
upstream.
The overload relay must be set to the motor current
rating. The thermal relay may be set to a current value
slightly lower than the full load value when the electric
pump is definitely underloaded, but the thermal
overload protection must not be set to current values
higher than the full load values.
Checking the rotation direction of electric pumps
with three-phase motors.
The direction of rotation may be checked before the
pump is filled with the liquid to be pumped, provided
it is run for very short starts only.
The pump must not be run until it is filled with
liquid.
Continuous dry running will damage the
mechanical seal beyond repair.
If the direction of rotation is not anti-clockwise when
facing the pump from the suction side interchange two
supply leads.
LSB 100-english
Artikel Nr. 771076129
cause the loss of
that a high sensitivity
ensuring multiple-pole
page 88

Fault finding chart

PROBLEM
1. The pump doesn't
start
the
2. Overload
protection trips:
– accidentaly
– systematically
Model LSB
PROBABLE CAUSE POSSIBLE
REMEDIES
A) No electrical power A) Supply electrical
B) Blown fuses: power
B1 Because
inadeguate (blowing B1 Replace fuses
current too low) with adequate ones
B2 Because the
motor or the supply B2 Repair the motor
cable are damaged or replace the cable
C) Overload
protection previously C)Reset the
tripped protection (if it trips
again see problem 2)
A) Momentary loss of
a phase
C) Incorrect setting C) Set to rated
of the motor switch current
D) The pump's D) Close the delivery
delivery is higher than valve until the
the rated one capacity returns to
the rated value
E) Dense and viscous E) Determine the
liquid actual power
requirements and
replace the motor
accordingly