YASKAWA V7

Fault Display
Digital RUN (Green)
Drive
Explanation
Causes and
Operator ALARM (Red)
Status Corrective Actions
FAN (Cooling fan fault) Check the following:
Cooling fan is locked. • Cooling fan
• Cooling fan wiring is not
Blinking connected.
OC (Overcurrent) • Short circuit
Drive output current at drive
momentarily exceeds output side
approx. 250% of rated • Excessive load inertia
current. • Extremely rapid accel/
decel time
(parameters n019 to n022)
• Special motor used
•Starting motor during
coasting
• Motor of a capacity
greater than the drive
rating has been started.
• Magnetic contactor
open/closed at the
drive output side
OV (Main circuit over- • Insufficient decel time
Protective voltage) parameters n020 and n022)
Operation. Main circuit DC voltage • Lowering of minus load
Output is exceeds the overvoltage (elevator, etc.)
shut OFF detection level because
and motor of excessive regenerative

coasts to energy from the motor. • Increase decel time.
a stop. Detection level: • Connect optional dynamic
230V: Stops at main circuit braking resistor.
DC voltage below
approx. 410V
460V: Stops at main circuit
DC voltage
approx. 820V or more
UV1 (Main circuit low • Reduction of input
voltage) power supply voltage
Main circuit DC voltage • Open phase of input supply
drops below the low- • Occurrence of momen-
voltage detection level tary power loss
while the drive output
is ON.

230V: Stops at main circuit Check the following:
DC voltage below • Power supply voltage
approx. 200V • Main circuit power
supply wiring is
460V: Stops at main circuit connected.
DC voltage • Terminal screws are
approx. 400V or more securely tightened.
Table 6-2. Fault Displays and Corrective Actions
6-4