Output Open Phase Protection; Ground Fault Protection; Cooling Fan Control - Omron VARISPEED F7 User Manual

Output Open Phase Protection

This function detects an open output phase by comparing the output current value of each phase with an inter-
nal set output open phase detection level (5% of inverter rated current). The detection will not work when the
output frequency is below 2% of the base frequency (E1-13).
Three settings are available:
L8-07=0, output open phase detection disabled
•
L8-07=1, the loss of one phase is detected only
•
L8-07=2, the loss of 2 or 3 phases is detected as well
•
Related Parameters
Parameter
No.
L8-07 Output open-phase protection selection
The function should be disabled if the motor capacity is very low compared to the inverter capacity. Otherwise
wrong output open phase faults might be detected.

Ground Fault Protection

This function detects the earth leakage current by calculating the sum of the three output currents. Normally it
should be 0. If the earth leakage current gets too high, the inverter output will be switched off and a GF fault is
shown on the display. The fault output is activated.
Related Parameters
Parameter
No.
L8-09 Ground protection selection
It is not recommended to disable this function.

Cooling Fan Control

This function controls the fan which is mounted to the inverters heatsink.
Related Parameters
Parameter
No.
L8-10 Cooling fan control selection
L8-11 Cooling fan control delay time
Name
Name
Name
Control Methods
Change
Factory during
V/f with
Setting Opera-
V/f
PG
tion
0 No A A
Control Methods
Change
Factory during
V/f with
Setting Opera-
V/f
PG
tion
1 No A A
Control Methods
Change
Factory during
V/f with
Setting Opera-
V/f
PG
tion
0 No A A
60 s No A A
Open Closed
Loop Loop
Vector Vector
A A
6
Open Closed
Loop Loop
Vector Vector
A A
Open Closed
Loop Loop
Vector Vector
A A
A A
65
6-