Yaskawa P7 Drive User Manual - Manual (Page 133)

Programming 5 - 49
L8-09 Output Ground Fault Detection Selection
The Drive has a ground fault detection circuit that activates when the current to ground exceeds 50% of the Drive’s rated out-
put current. The current to ground is determined by comparing the measured current on each of the output phases. If the cur-
rent 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
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.
L8-19 Overheat Frequency Reference Reduction Level
Setting Range: 0.0 to 100.0% of maximum frequency
Factory Default: 20.0% of maximum frequency
When the heatsink temperature reaches the OH Pre-alarm level (L8-02) and the Overheat Pre-Alarm Operation Selection
parameter is set for Alarm and Reduce (L8-03= “4: OH Alarm & Reduce”), the L8-19 parameter sets the amount of speed
decrease that will be applied to the Speed Command in order to lower the heatsink temperature. The decrease in speed will
lower the current being switched and conducted by the heat producing output transistors of the Drive.
Parameter L8-19 is set in percentage of maximum frequency (E1-04).
Setting Description
0 Disabled
1 Enabled (factory default)
Setting Description
0 Fan On-Run Mode (factory default)
1 Fan Always On