YASKAWA E7U Programming Manual page 120

Phase Loss
Fault Signal
Fault Contact
L8-09 Output Ground Fault Detection Selection
Setting
0 Disabled
1 Enabled (factory default)
The Drive has a ground fault detection circuit that activates when the current to ground exceeds 50% of the Drive's rated output
current. The current to ground is determined by comparing the measured current on each of the output phases. If the current to
ground is determined to be above 50% of the Drive's rated output current the digital operator will display a GF and the Drive will
coast to stop.
L8-10 Heatsink Cooling Fan Operation Selection
Setting
0 Fan On-Run Mode (factory default)
1 Fan Always On
L8-11 Heatsink Cooling Fan Operation Delay Time
Setting Range: 0 to 300 Seconds
Factory Default: 300 Seconds
Parameters L8-10 and L8-11 allow the Drive programmer to customize the heatsink cooling fan operation. Parameter L8-10
determines whether the cooling fans are always ON whenever the Drive is powered (L8-10= "1: Fan Always On") or if the
cooling fans are only ON when the Drive is in a Run condition (L8-10= "0: Fan On-Run Mode").
Parameter L8-11 is a delayed OFF for the cooling fan if L8-10= "0: Fan On-Run Mode". When the cooling fans are set to turn
OFF when the Run command is removed, parameter L8-11 will cause the fans to continue cooling the Drive for the amount of
time programmed into L8-11 after the Run command is actually removed. The Drive can be programmed to allow the cooling
fan to run for up to 5 minutes (factory default) after the run command is removed.
Both parameters are intended to extend fan life while still providing sufficient cooling for proper Drive operation.
Input Phase Loss
DC Bus
Voltage
Fig. 83 Input Phase Loss Detection Diagram
Description
Description
10 seconds
Programming 114
Closed
t
Open
L8-06
t
Time