YASKAWA VS mini C Series Instruction Manual page 63

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
Inverter output current grounding at inverter
momentarilyexceeds output side
approx. 250% of rated • Excessive loadGD 2
current. * Extremelyrapid accet/
decel time
(constants n20 to n23)
• Specialmotor used
• Starting motor during
oL" coasting
• Motor of a capacity
greater than the inverter
ratinghas beenstarted.
• Magneticcontactor
open/closedat the
inverter OUtpUt s ide
OV (Main circuitover- • Insufficient deceltime
Protective voltage) i(constants n21 and n23)
Operation Main circuit DC voltage • Lowering of minus load
o_ • Output is exceeds the oventoltage (elevator, etc.)
___ shut OFF detection level because _.
and motor of excessiveregenerative
coaststo energy from the motor. • Increase decel time.
• Connect optional
a stop. braking resistor.
UV1 (Maincircuit low - Reductionof input
voltage) power supply voltage
Main circuit DC voltage • Ope_pt'_ase d intout s_
dropsbelow the_ow- • Occurrenceof momen-
voltage detection level tary power loss
while the inverter output • Insufficient accel time
t.J_ , isON.
(constants n20 and n22
_heck the following:
• Powersupplyvoltage
. Main clrceitpower
supply wiring is
connected.
• Terminal screws are
secure.
• Increase accel time.
UV2 (Control power Cycle power.
_'_J2 supplyfault) If the fault remains,
Voltagefaultof control replacethe inverter.
_owersupplyisdetected
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