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6 Protective Function
6-1 List of protective functions
When the protective function is activated, drive output is instantly cut off (while the motor coasts until it is
stopped), and an alarm is issued, and the details of the alarm are displayed on the keypad panel.
Table 6-1-1 List of Protective Functions
Alarm Name
Keypad
panel dis-
play
Contents of operation
OC1
During acceleration
OC2
During deceleration
Overcurrent
OC3
While running at
constant speed
If the drive output current momentarily exceeds the over-
current detection level because of an overcurrent in the
motor or the short-circuit in the output circuit, the output is
shut down, an alarm is issued, and the drive is tripped.
OU1
During acceleration
OU2
During deceleration
Overvoltage
OU3
While running at
constant speed
If the DC voltage of the main circuit exceeds the overvolt-
age detection level because of an increase in the regenerat-
ing current from the motor, etc., output is shut down, an
alarm is issued, and the drive is tripped. However, protec-
tion against inadvertent overvoltage loading (e.g., high-
voltage line) might not be provided.
Undervoltage LU If the DC voltage of the main circuit falls below the undervoltage detection level
because of a lowered power supply, output is shut down to protect the drive. If the
restart function after momentary power failure is not activated, an alarm is issued
and the drive is tripped.
If the restart function is activated, the drive restarts automatically with no alarm.
For further details of the protective function, refer to the descriptions of Function
F14.
Overheating of
heat sink
OH1 If the temperature of the heat sink used for cooling the rectifier diodes and IGBTs
rises because of cooling fan failure, etc., protective function is activated to stop
operation, an alarm is issued, and the drive is tripped.
External Alarm
OH2 If the control circuit terminal THR (functional change of X1 to X3 terminals) is
set to OFF, an alarm is issued and the drive is tripped.
Motor overload
OL If the motor current exceeds the operating level set by the electronic thermal O/L
relay, output is shut down to protect the motor, an alarm is issued, and the drive is
tripped.
Drive overload
OLU If the output current exceeds the drive rated overload current, output is shut down,
an alarm is issued, and the drive is tripped.