Hidrostal A2Q - Fault table

9 | Faults
42 / 49 Hidrostal AG
9.2 Fault table
Error description Cause Remedial action Personnel
No delivery Pump not vented Vent pump Instructed persons
(operators)
Speed too low Check all three phases for
failure, check mains frequency,
check phase connections
Qualified electricians
Speed too low in
frequency inverter (FI)
operation
Check the speed selected at the
FI
Instructed persons
(operators)
Air penetrates at
suction side
Check suction line and/or fluid
level
Instructed persons
(operators)
Pressure line
obstructed/ gate valve
closed
Check pressure line/gate valve Instructed persons
(operators)
Air or gas in conveyed
medium
Check the conveyed medium for
air or gas
Instructed persons
(operators)
Air or gas at the rear
side of the impeller
Check the conveyed medium for
air or gas
Instructed persons
(operators)
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)
Insufficient flow rate Air penetrates at
suction side
Check suction line and/or fluid
level
Trained personnel
Air or gas in conveyed
medium
Check the conveyed medium for
air or gas
Instructed persons
(operators)
Wrong rotational
direction
Increased vibrations
Check the rotational direction,
correct if necessary. See chapter
Checking the rotational
direction [▶38]
Qualified electricians
Delivery height too high
(exceeds calculation)
Check the delivery height Instructed persons
(operators)
Speed too low Check all three phases for
failure, check mains frequency,
check phase connections
Qualified electricians
Thick matter
concentration higher
than assumed
Check thick matter concentration Instructed persons
(operators)
Impeller or suction line
obstructed
Check pump and suction line for
obstructions
Instructed persons
(operators)
Excessive impeller
clearance
Check the impeller clearance Instructed persons
(operators)
Impeller damaged Check the impeller for damage,
replace it if necessary
Service centre
Voltage too low Check the voltage. With star-
delta starting: Check the
switchover function
Qualified electricians