Fault Display and Contents
Fault Display Inverter Causes and
Digital RUN (Green) Status Explanation
Corrective
Actions
Operator ALARM (Red /
q,
OC (Overcurrent} '. Short circuit or
Inverteroutput current grounding atinverter
momentarilyexceeds output side
approx. 250% ofrated • Excessive loadGD2
current. * Extremelyrapid accet/
decel time
(constants n20to n23)
• Specialmotor used
• Starting motor during
oL" coasting
• Motor ofa capacity
greater thanthe inverter
ratinghas beenstarted.
• Magneticcontactor
open/closedatthe
inverter OUtpUtside
OV(Main circuitover- • Insufficient deceltime
Protective voltage) i(constants n21 andn23)
Operation Main circuit DC voltage • Loweringof minus load
o_ • Output is exceeds the oventoltage (elevator, etc.)
___ shut OFF detection level because _.
and motor of excessiveregenerative
coaststo energy fromthe motor. • Increasedecel time.
• Connectoptional
a stop. braking resistor.
UV1 (Maincircuit low - Reductionof input
voltage) powersupply voltage
Main circuit DCvoltage • Ope_pt'_ased intouts_
dropsbelow the_ow- • Occurrenceofmomen-
voltage detection level tary power loss
while the inverter output • Insufficientaccel time
t.J_ , isON.
(constants n20and n22
_heck the following:
• Powersupplyvoltage
. Mainclrceitpower
supplywiring is
connected.
• Terminal screws are
secure.
• Increaseaccel time.
UV2 (Controlpower Cycle power.
_'_J2 supplyfault) If the fault remains,
Voltagefaultofcontrol replacethe inverter.
_owersupplyisdetected
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