KEB COMBIVERT F5 Instruction Manual page 177

Error/Message Description
E.ENCC Loss of encoder
Error Encoder channel or
Interface communication
between encoder
and drive for an
absolute encoder.
E.BUS This message
Error HSP5 indicates
Serial Com. that serial
communication
between the
keypad operator
and the drive or
the drive and the
elevator control
has been lost
(See parameter
US.29 Ser.Com
Watchdog Time to
bypass this fault).
E.Br Error current
Error Low check.
Motor Current
Prior to every run
the drive sends
current to each
phase of the
motor to verify
the connection.
Afterward, the
drive applies
magnetizing
current (Induction
Motors) and
monitors whether
the motor is
magnetized or not.
*Additional information at end of section
Diagnostics and Troubleshooting
Cause/Solution/Troubleshoot
This error should be accompanied with further
information describing the nature of the fault. Refer to
2.LF.26 Encoder Status for further details.
Verify keypad operator is seated properly to the
inverter.
Verify connection of the serial comm. to the keypad
operator at port X6C.
Verify there are no bent or missing pins where the
serial comm. cable from the controller plugs into the
keypad operator.
Verify serial comm. between controller and drive.
Verify connection of keypad operator and inverter control
card.
Verify there are no bent or missing pins where the
keypad operator connects to the control card.
Possible causes for low motor current error during
current check:
Motor contactor contacts are burnt or damaged.
Bypass motor contactor (do not simply jumper!)
to test and replace as needed.
One or more motor leads is not connected.
Motor contactor is not closing or not closing in time
Bypass motor contactor or verify switching time.
Motor windings are damaged.
Measure motor resistance.
The phase current check can be bypassed by setting
US.25 = 0
177