KSB PumpDrive 2 - Page 194

11 Trouble-shooting
194 of 212
PumpDrive 2
Message
number
Message Description Behaviour
W72 Frequency low Frequency low Self-acknowledging
W73 Power high Power high Self-acknowledging
W74 Power low Power low Self-acknowledging
W75 Limited stop ramp Set stop ramp time exceeded Self-acknowledging
W76 24V overload Internal 24V power supply unit overloaded Self-acknowledging
W77 PumpMeter
communication
Incorrect PumpMeter communication Self-acknowledging
W78 Firmware update for field
bus required
Module incompatible with main module Self-acknowledging
W79 Firmware update for HMI
required
Module incompatible with main module Self-acknowledging
W80 Low flow velocity Lower limit for flow velocity undershot Self-acknowledging
W81 Field bus communication Defective field bus module Self-acknowledging
W99 General settings loaded General settings loaded Self-acknowledging
Table118: Warnings
Warning Possible causes Remedy
Dynamic overload
protection
Incorrect motor data set Match motor data to motor used.
Wrong direction of rotation of the pump Change the direction of rotation of the motor via
the phase sequence.
Hydraulic overload Reduce the hydraulic load.
Pump blocked mechanically/runs sluggishly Check pump.
Motor terminal board wired incorrectly
(delta/star)
Wire motor terminal board correctly.
PumpDrive power < motor power or
Output current < motor current
Wrong device ordered; mount larger PumpDrive
model.
Frequency inverter carrier frequency set too
high
Set carrier frequency to permissible range.
Ambient temperature of PumpDrive > 50 °C Impermissible operating range; mind power
derating.
Fluctuating DC link voltage when pump is
not running
Check mains voltage quality.
Incorrect motor current measurement Measure current using suitable snap-on ammeter
and compare with the information displayed on
the control panel.
NOTE!Approx. 10% tolerance is permissible.
Pump runs in reverse when motor is not
supplied with current
Check swing check valve.
Motor voltage output is too low at nominal
load, < 380V at nominal load
Check line input voltage; enter motor current at
380V mains voltage; fit larger-sized motor.
Broken wire Cable integrity monitoring Replace defective sensor with new one.
Low flow/overload The driven pump is operated under low
flow/overload conditions
Impermissible operating range; operate the
pump within the permissible range.
24V overload 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 .
Short circuit of consumers connected to
24VDC voltage supply
Disconnect defective 24VDC consumers.
Control terminal wiring errors (DigIn, AnIn) Re-wire properly.