YASKAWA E7U Programming Manual page 75

Function: Restart Enabled
Setting: 1E
Depending on the setting of parameter L5-01, the Drive may be configured to automatically attempt to restart itself after certain
faults. The Restart Enabled output will be closed once the restarts begin and will remain closed until a successful restart is
accomplished or the number of Auto Restart attempts as specified by L5-01 is reached.
A timing diagram for the Auto Restart function is contained in the parameter L5-01 description.
Function: Overload (OL1) Alarm
Setting: 1F
The OL1 fault function is designed to protect the motor. It estimates the motor's winding temperature based on the output
current, output frequency, and time. The OL1 time is determined by the setting of parameters E2-01, L1-01, and L1-02. An
Overload digital output will close whenever 90% of the programmed OL1 time is exceeded.
Function: OH Prealarm
Setting: 20
The Overheat fault function (OH) is designed to protect the Drive from excessive temperature damage. Thermistors attached to
the heatsink of the Drive monitor the temperature near the devices attached to the heatsink (e.g. input diode modules, output
o
transistor modules) and will fault the drive if the temperature reaches 105 C.
An OH Prealarm digital output will close whenever the heatsink temperature reaches the level specified by parameter L8-02.
Parameter L8-03 will determine the Drive's response to reaching the OH Prealarm level, in addition to closing the configured
digital output.
Function: Drive Enabled
Setting: 38
A Drive Enable digital output will reflect the status of a digital input configured as a Drive Enable input
(H1-0x= 6A). If the Drive Enable digital input is closed then the Drive Enabled digital output will also close.
Function: Drive Waiting
Setting: 39
A Drive Waiting digital output will close during the time-out period between the input of a Run command and the expiration of
the delay time specified by b1-11.
Function: Frequency Reduced, OH
Setting: 3A
A Frequency Reduced, OH digital output will close when L8-03 = "4:OH Alarm & Reduce" and an overheat pre-alarm is
detected.
Function: Run from Serial Com
Setting: 3B
A Run from Serial Com digital output will close when the drive run command is from embedded serial com or the com option
card.
Programming 69