Troubleshooting - FLOWTECH flowpac compact 1F.BD Operation And Maintenance Manual

Maintenance and hydraulic inspection.
Before proceeding with any kind of inspection or maintenance, make sure that the pump is disconnected
•
from the power fine without any chance of accidental reconnection.
Normally the pump does not need any maintenance. It may happen that impellers get blocked by small
•
rocks, seaweed or fibers.
To clean these or other components unscrew the screen counterclockwise clamping the shroud.
•
• The mechanical seal is oil lubricated with 6 cm of WHITE OIL 300 inside a chamber in the lower
bearing body . After disassembling the pump, it must be carefully filled up again with the same
volume.
• We strongly suggest to replace all seals every time you disassemble the pump. The manufacturer will
supply these seals in one complete Kit.
• If you disconnect the cable-connector, do clean the male connector pins (in the stator) and the
female part (on the cable) before reconnect, preferably using dry compressed air.
• The liquid can be polluted from loss of mechanical seal lubricating liquid.
• If the power supply cable is damaged, must be changed by the manufacturer or by any service.
•
For any requirements, please contact our Service Department.

Troubleshooting

Issue
The pump
starts and
stops.
The pump fails
to deliver, or
the discharge
flow is too
small,
Pump starting
too often.
Cause
Incorrect voltage or
voltage drop.
Open circuit in motor
power cord.
The motor protection
trips out.
Voltage low.
Suction strainer
clogged.
Wrong direction of
rotation (three- phase
motor).
No water in borehole,
or level too low.
Differential on
pressure-sensitive
switch too small.
Float or electrodes
(PMS) incorrectly
placed.
The bladder tank
is too small or
is insufficiently
pressurized.
Remedial action
Check the voltage during starting; if the cable cross-
section is too small, the voltage drop may be such that
the motor cannot function normally.
Measure the resistance between phases. Refit the
pump if necessary and check the cable.
Check the current settings on the thermal relay and
compare it to the indicated value. Important: do not
insist if the relay trips out repeatedly (try to locate the
cause); forced operation of the unit could damage the
motor (by overheating) in a very short time.
Check the supply voltage at the box.
Refit the pump: unclog and clean.
Interchange two phase wires at the box.
Check the level; it must be at least 150 mm above the
pump strainer (with pump running).
Increase the Stop/Start difference.
Adjust the distance between them so that the time
between the stopping and starting of the pump
reasonable.
Check and adjust the pressures (On/Off). Check the
pressure in the tank. Add a tank to increase capacity
or change the tank.
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