Alert Possible causes
Remedy
37)38)
Fluctuating DC link voltage
(1-4-1-1)
when
pump operates at rated values
Check mains voltage quality.
Mains fuse has tripped Fit new mains fuse.
Brief interruption of mains voltage Check the mains voltage.
24 V DC voltage supply overload Reduce current input to 24 V DC, compare the
number of electrical connections with the
maximum permissible current load of the 24 V DC
supply (⇨ Section 4.5 Page 15) .
Over Voltage Line input voltage too high Check the mains voltage.
Fluctuating DC link voltage
(1-4-1-1)
when
pump is not running
Check mains voltage quality.
Fluctuating DC link voltage
(1-4-1-1)
when
pump operates at rated values
Check mains voltage quality.
Mains fuse has tripped Fit new mains fuse.
Braking resistor defective Replace PumpDrive.
External voltage supplied to DigIn/AnIn Wire properly and check wiring.
Ramp times too short Select longer ramp times.
Pump runs in reverse when motor is not
supplied with current
Check swing check valve.
Operation with motor running idle Restore load to motor.
Over Current Mains power supply connected incorrectly Connect mains power supply to L1, L2, L3, PE.
Motor terminal board wired incorrectly
(delta/star)
Wire motor terminal board correctly.
Incorrect motor data set
(3-3-2)
Match motor data settings to motor used.
Parallel operation of motors This mode of operation is not permissible.
Sensor cable shielding connected incorrectly Connect sensor cable shielding to PE on one end
only.
PumpDrive rating < motor rating or
Output current < motor current
Wrong device ordered; mount larger PumpDrive
model.
Motor voltage too low Change V/f characteristic to Linear (⇨ Section
7.2.6.2 Page 93) .
Ramp times too short Select longer ramp times.
Wrong direction of rotation of the pump Change the direction of rotation of the motor via
the phase sequence.
Pump blocked mechanically/runs sluggishly Check pump.
FI carrier frequency
(3-11-1-1)
set too high Set carrier frequency to permissible range
(⇨ Section 4.5 Page 15) .
Incorrect motor current measurement
(1-2-1-5)
Measure current using suitable snap-on ammeter
and compare with
(1-2-1-5)
.
Note: Approx. 10 % tolerance is permissible.
Pump runs in reverse when motor is not
supplied with current
Check swing check valve.
Over Current
Breakover Curre
Braking resistor
Stop ramp time too short Increase ramp time.
Pump runs in reverse when motor is not
supplied with current
Check swing check valve.
Operation with motor running idle Restore load to motor.
Generator operation of pump Impermissible operating range
Int Temp incorr
Internal
temperature
impermissible
Ambient temperature of PumpDrive > 40 °C Impermissible operating range; mind power
derating (⇨ Section 4.5 Page 15) .
Ambient temperature of PumpDrive < 0 °C
Dirt in external fans Clean fans.
Heat sink/cooling fins dirty Clean heat sink/cooling fins.
FI carrier frequency
(3-11-1-1)
set too high Set carrier frequency to permissible range
(⇨ Section 4.5 Page 15) .
PumpDrive rating < motor rating or
Output current < motor current
Wrong device ordered; mount larger PumpDrive
model.
37)
Disconnect PumpDrive from the power supply to rectify faults on current-carrying components. Observe the safety
information!
38)
Restore the PumpDrive default settings.
11 Trouble-shooting
136 of 162
PumpDrive
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