184 H7 ASD Operation Manual
OCA 1,
2, or 3
U, V, or W Phase
Short Circuit
This fault occurs in the
event of a short circuit at the
U (1), V (2), or W (3)
output leads of the ASD.
• Output resistance of the U,
V, or W leads of the ASD
are not within the
acceptable range.
• Ensure that the ASD
output and the motor are
connected correctly.
• Disconnect the motor
from the ASD and retry.
• Replace the applicable
IGBT (U, V, or W).
• Contact your Toshiba
distributor for repair
information.
OCL Motor
Overcurrent
(Startup)
This fault occurs when a
short circuit is detected at
the output of the ASD.
• Output resistance of the U,
V, or W leads of the ASD
are not within the
acceptable range.
• Ensure that the output of
the ASD is correctly
connected to the motor.
• Decrease the output short
circuit detection pulse on-
time settings of F614.
OCR Dynamic Braking
Resistor
Overcurrent
This fault is caused by the
inability of the system to
adequately discharge the
bus voltage during
regeneration.
• No dynamic braking resistor
(DBR) installed.
• Deceleration time is too
short.
• Improper DBR setup
information.
• Defective IGBT7 (or
IGBT7 ckt.).
• Excessive input voltage.
• Install a DBR.
• Extend the deceleration
time.
• Ensure that the DBR
setup information is
correct (program
⇒
protection parameters
⇒
dynamic braking).
• Increase the value of the
DBR installed.
• Replace IGBT7.
• Ensure that the 3-phase
input voltage is within
established parameters.
OFF ST-to-CC
Opened
This fault is caused by the
ST-to-CC connection being
open.
• ST-to-CC connection is
open.
• (If applicable) MS1 AUX is
defective, inoperative, or
there is an open circuit in
the MS1 AUX circuit (see
Installation Notes on pg. 6).
•Close the ST-to-CC
connection.
• Confirm that the MS1
AUX circuit is
functioning properly.
• Remove the ST-to-CC
requirement via Program
⇒
Terminal Selection
Parameters
⇒
Input
Special Functions
⇒
ST
Signal Selection
⇒
ST-
CC Not Required.
EOI
Display
Function Description Possible Causes Corrective Action
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