Hidrostal A2Q - Page 44

9 | Faults
44 / 49 Hidrostal AG
Error description Cause Remedial action Personnel
Delivery height too high
(exceeds calculation)
Check delivery height, check
gate valve
Instructed persons
(operators)
Impeller or suction line
obstructed
Check pump and suction line for
obstructions
Instructed persons
(operators)
Impeller damaged Check the impeller for damage,
replace it if necessary
Service centre
Motor damaged Check the motor, repair it if
necessary
Qualified electricians
Service centre
Loose anchoring Check the anchoring; correct if
necessary
Trained personnel
Bearings worn out Check the bearing for damage,
replace it if necessary
Trained personnel
Service centre
Impeller out-of-balance Check impeller, replace if
necessary
Trained personnel
Service centre
Impeller brushes
against suction cover
Check the impeller clearance,
readjust it if necessary. See
chapter Check/readjust
impeller clearance [▶32]
Trained personnel
Motor overloaded Pressure line
obstructed/ gate valve
closed
Check pressure line/gate valve Instructed persons
(operators)
Thick matter
concentration higher
than assumed
Check thick matter concentration Instructed persons
(operators)
Speed too high Check all three phases for
failure, check mains frequency,
check phase connections
Qualified electricians
Speed too high in
frequency inverter (FI)
operation
Check the speed selected at the
FI; reduce it if necessary
Instructed persons
(operators)
Specific gravity of
delivery medium higher
than assumed
Check the specific weight of the
conveyed medium
Trained personnel
Motor damaged Check the motor, repair it if
necessary
Qualified electricians
Service centre
Voltage too low Check voltage Qualified electricians
Loss of coolant Check coolant / oil level, top up if
necessary. See chapter
Checking the oil [▶35]
Trained personnel
Wrong impeller installed Check the impeller type Service centre
Impeller brushes
against suction cover
Check the impeller clearance,
readjust it if necessary. See
chapter Check/readjust
impeller clearance [▶32]
Instructed persons
(operators)
Thick sludge and small
impeller clearance
Increase the impeller clearance Instructed persons
(operators)