Installation, Operating and Maintenance Instruction
Model L, LN
LN 100-ger/fr/eng
Page 57
Revision 03
Artikel No. 771073301
Issue
01/2010
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 cause the loss of the
guarantee.
Electrical connections
Make sure that the rated voltage corresponds to
the supply voltage.
Ground the pump before making any other
connection.
We recommend that a high sensitivity
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 ensuring multiple-pole
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.
Fault finding chart
PROBLEM
PROBABLE CAUSE POSSIBLE
REMEDIES
1. The pump doesn’t
start
A) No electrical
power
B) Blown fuses:
B1 Because
inadeguate (blowing
current too low)
B2 Because the
motor or the supply
cable are damaged
C) Overload
protection previously
tripped
A) Supply electrical
power
B1 Replace fuses
with adequate ones
B2 Repair the motor
or replace the cable
C)Reset the
protection (if it trips
again see problem 2)
2. Overload
protection trips:
– accidentaly
A) Momentary loss of
a phase
– systematically
C) Incorrect setting
of the motor switch
D) The pump’s
delivery is higher than
the rated one
E) Dense and viscous
liquid
C) Set to rated
current
D) Close the delivery
valve until the
capacity returns to
the rated value
E) Determine the
actual power
requirements and
replace the motor
accordingly
Summary of Contents for L Series
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