Larsen & Toubro C*2000 Series, User Manual

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Chapter 12 Troubleshoot and maintenance
12-6 Cx2000 AC Drive
Electronic thermal
protection
 Motor is overheated.
 The inverter load is greater than the
rated value.
 The electric thermal protection is set
too low.
 The inverter capacity is set
incorrectly.
 Long operation at low speed.
 Reduce the load or running
frequency.
 Increase the inverter capacity.
 The electronic thermal protection
rating is set correctly.
 Set the inverter capacity correctly.

Choose a cool fan with a
separate power supply.
Fault remedy
Protective functions Abnormal causes Countermeasures
Contract A
Fault signal input
 The terminal with the function c
hoice (117
～
121)of multi-function in
put terminal set with 18 is closed.
 The terminal with the function c
hoice (117
～
121)of multi-function in
put terminal set with 19 is opened.
 Remove the abnormity of the loop
connected on the external fault terminal
and check the causes for external faults.
Contract B
Fault signal input
Frequency
command loss
 Inverter terminal V1 and I has
no frequency commands.
 Check the connection wiring of AIN
terminal and command grade.
Brake control
Abnormity
 Operation is not available if
there is no brake open current.
 Check the capacity and wiring of
motor.
EEP: Parameter save error
HWT: Hardware fault
iE7: Communication error between panel and inverter.
COM: Keypad error
NTC: NTC error
 Contact your local LT Branch.