Toshiba TOSVERT VF-P7 Instruction Manual page 239

(Continued from the preceding page)
Indication

















(*1)
(Continued on the following page)
Contents
･ Input voltage abnormally varied.
1 Power capacity is 500 kVA or
more.
2 Power-factor improving
capacitor was turned on/off.
Over-voltage 3 Some unit using thyrister is
during fixed connected with the same
speed power supply line.
･ Motor falls into regeneration status
because it is rotated fast
exceeding inverter's output
frequency by power of loaded
side.
･ Rapid acceleration is operated.
･ DC breaking rate is too high.
･ V/f parameter is improperly set.
Inverter ･ Running motor is started during
overloaded momentary power failure status
or so.
･ Load is too heavy.
･ V/f parameter is improperly set.
･ Motor is locked.
Motor
･ Continuous operation in low
overloaded
speed range.
･ Motor is operated with overload.
･ Rapid deceleration is operated.
･ Dynamic braking rate is too high.
Dynamic braking
resistor overload
･ Set over-voltage limit operation
revel parameter  too small.
･ Cooling fan is not actuated.
･ Ambient temperature is too high.
Overheat ･ Vent of cooling fan is shut.
･ Some heat generating matter is
located nearby.
･ Internal thermistor of unit is
disconnected.
Emergency ･ Inverter is stopped by panel operation
stop during automatic or remote operation.
･ Error occurs during writing data.
EEPROM error
Initial read-error ･ Something abnormal in internal data. ･ Make a service call.
Initial read-error ･ Something abnormal in internal data. ･ Make a service call.
Main RAM fault ･ Something abnormal in control RAM. ･ Make a service call.
Main ROM fault ･ Something abnormal in control ROM. ･ Make a service call.
CPU fault ･ Something abnormal in control CPU. ･ Make a service call.
Interruption ･ Something abnormal occurred
communication during communication operation.
fault
Gate array ･ Main gate array is abnormal.
fault
Output current ･ Main output current detector is
detector error abnormal.
･ Something abnormal occurred in
Optional unit some optional unit (including
fault abnormal communication [optional
add-on cassettes]).
Flush memory ･ Something abnormal in flush
fault memory.
･ Output current declined to the
low-current detection level during
low-current
operation.
operation
Expected causes
L-2
Countermeasures
･ Try to insert input reactor.
･ Install dynamic braking resistor.
･ Extend acceleration time #1 .
･ Decrease values of DC injection
braking current  and DC
injection braking time .
･ Check V/f parameter.
･ Use  (Auto-restart) and 
(Regenerative power ride-through control).
･ Raise rating of the inverter.
･ Check V/f parameter.
･ Check loading unit.
･ Reset  properly to motor's
overload reduction start-up
frequency.
･ Extend deceleration time #1 .
･ Increase capacity (wattage) of
dynamic braking resistor and reset
the PBR capacity parameter .
･ Increase the setting value of .
･ After cooling down inverter, reset it
from failure and try to restart it.
･ If cooling fan does not work in
operation, it needs replacement.
･ Secure spaces in the periphery of the
inverter.
･ Don't locate any heat generating thing
near the inverter.
･ Make a service call.
･ Reset the inverter.
･Again turn on the inverter. If it is not
reset, make a service call.
･ Check communication units and their
connections.
･ Make a service call.
･ Make a service call.
･ Check connection of optional
board(s).
･ Refer to instructions of options
concerned.
･ Make a service call.
･ Check to see if low-current detection
level is set properly to the system or
not ().
･ If low-current detection level is
properly set, make a service call.