Troubleshooting
26 300758785_002_C1 - 06/2019 - © Leybold
Malfunction Error
message
Error
code
(MODBUS)
Brief Des-
cription
Likely cause Remedy
Pump does not
start.
–
– No mains voltage present Check mains power supply.
Set the mains switch on the pump
to 1.
Mains cable defective or not
correctly inserted
Check the pump’s power supply.
If operating using the start-stop
switch: the plug supplied is not
connected to the X1 control
interface, or pins 8 and 9 are
not bridged.
Connect the plug supplied, with a
bridge between pins 8 and 9, to
the X1 control interface.
If operating using the X1 con-
trol interface: start-stop button
is not set to “start”.
Set start-stop switch to “start”.
Drive defective Contact Leybold Service.
Pump does not
start.
LuS
14 DC Under-
voltage or
Controller
Under-
voltage“
Input voltage too low Compare the voltage range on the
pump’s nameplate with the availa-
ble mains voltage, and connect
the pump to a power supply at the
correct voltage.
Pump does not
start or switches
off.
LuS
14 Controller
Under-
voltage
Voltage too low for controlling
the frequency converter
Disconnect the pump from the
mains for at least 10 seconds and
restart.
Pump does not
start or switches
off.
LuS
14 DC Charge
Circuit Fault
Charging circuit for DC bus is
defective.
Disconnect the pump from the
mains for at least 10 seconds and
restart.
Pump does not
start or switches
off.
oud
oun
8
9
DC Over-
voltage
DC bus voltage was too high.
The rundown time is too short.
Unstable motor controller
Input voltage is too high.
Compare the voltage range on the
pump’s nameplate with the availa-
ble mains voltage, and connect
the pump to a power supply at the
correct voltage.
Pump does not
reach nominal
speed 210 Hz
–
– Inlet pressure > 50 mbar Close the pump inlet and check
the rotational speed on the display.
Outlet blocked
Unacceptably high back pres-
sure in outlet
Ensure the pump outlet is clear.
Ensure that outlet pressure does
not exceed 1200 mbar.
Others Contact Leybold Service.
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