LiteOn EVO 6800 Series - Fault Detection

211
Keypad
Display
Fault Name
Cause
Possible Solution
while attempting to
perform a fault restart or
after a momentary power
loss
3. Check the motor capacity
· Make sure the motor capacity is
right for the drive rating.
4. During a momentary power
loss or an attempt to reset a fault,
the alarm is displayed. However,
there is no need to take any
action because the fault display
will disappear shortly
8.2 Fault Detection
Table 8.2 Fault Displays, Causes, and Possible Solution
Keypad
Display
Fault Name
Cause
Possible Solution
GF
Ground Fault
Output power cable is
damaged
Check and replace output power
cable
oVA,
oVd,
oVC
Overvoltage
(Acceleration,
Deceleration and
Constant Speed)
The main circuit DC
voltage exceeded the
overvoltage detection
level
200V class: 410V
400 V class: 820 V
1. Regenerative energy is
flowing from the motor into
the drive because the
deceleration time is too
short
2. The motor overshoot the
speed reference because
the acceleration time is too
short
3. Excessive braking load
4. Surge voltage entering
from the drive input power
5. Motor short-circuited
Ground fault current
charges the drive main
circuit capacitor.
6. Improper parameter
settings for Speed Search
(including Speed Search
after a fault restart and after
a momentary power loss)
7. Drive input voltage is too
high
1. Increase the deceleration time
settings (C1-01, C1-03, C1-05,
C1-07)
»Install a braking unit or a
dynamic braking resistor
»Set P3-03 (Stall Prevention during
Deceleration) to 1
(Enabled)(default is 1)
2. Confirm if overvoltage alarm
oVA or oVC was triggered during
sudden drive acceleration.
»Increase the acceleration time
»Use S-curve deceleration and
acceleration times and increase
the value set to C2-01 ( S-curve
at acceleration end )
3. Install a braking unit or a
braking resistor
4. Install a DC reactor
»Thyristor convertor and phase
advancing capacitor using the
same input power supply might
cause a voltage surge