E.OT
Motor over
temperature fault
1. The wiring of the motor temperature
sensor is loose
Check motor temperature sensor
wiring
2. Motor temperature is too high
Increase the carrier frequency or take
other measures to dissipate heat from
the motor
error code
Fault type
Possible cause of failure
Countermeasures
E. UV
Undervoltage fault
Grid voltage is low
Check input power
E.OL3
Buffer supply
overload
The bus voltage fluctuates up and down at
the undervoltage point
seek service
E. StG
Motor to ground
short circuit fault
Motor short circuit to ground
Check the motor and cables
E.CbC
Wave-by-wave
current limiting
fault
1. The load is too large or the motor stalls
Reduce load and check motor condition
2. The selection of the frequency converter
is too small
Choose a frequency converter with a
higher power rating
E.INV
Inverter hardware
overcurrent fault
Refer to overcurrent fault Refer to overcurrent fault
E.LL
load drop fault
The operating current of the inverter is
less than the set value of FE.18
Check if the load is off
Set the detection parameters
reasonably according to the situation
A short circuit of the braking resistor of the inverter may cause damage to the braking unit of the
inverter.
Notice
10.7 Operation exception handling
Table 10.4 Operation exception handling methods
Enter the user password correctly
Phenomenon condition Possible Causes
Countermeasures
The operator
panel is not
responding
Individual keys or
all keys do not
respond, or the
panel prompts
"ErCOC"
The operation panel lock
function takes effect
In the state of stopping or running parameters, first
press and hold the PRG key, and then continue to
press ▼ to unlock
Power off the inverter completely and then power
on again
Check the cable and replug it
Poor connection of operation
panel connection wire
Replace the operation panel or call for service
The function code cannot be
modified
Cannot be
modified in
running state
This function code cannot
be modified in the running
state
Modify while down
Some function
codes cannot be
modified
Function code F7.03 is set to
1 or 2
Change F7.03 to 0
This function code is the
actual detection value
Actual parameters cannot be modified by users
Press MF no
response
The operation panel lock
function is in effect or other
See "Operation Panel Not Responding" Solution
Cannot enter
after pressing
PRG, the function
code display
status shows
0000
With user password
seek service
The function
code cannot
be modified
080
NVF2G-S Series Inverter User's Guide
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