Omron VARISPEED L7 User Manual

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 Output Open Phase Detection
This function detects an open output phase by comparing the output current value of each phase with the out-
put open phase detection level (5% of inverter rated current). The detection does not work when the output fre-
quency is below 2% of the base frequency.
Three settings are available:
• L8-07=0, no output open phase detection
• 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
The detection delay time can be set in parameter L8-20.
Related Parameters
 Ground Fault Detection
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 is switched off and a GF fault is
shown on the display. The fault contact is activated.
Related Parameters
Precautions
• It is not recommended to disable this function.
• A Ground Fault can also be detected if the contactors at the inverter output are opened when the output is
still active. Therefore, to prevent false Ground Fault detection check the sequence and make sure, that the
output is switched of or base blocked before opening the contactors.
Parameter
No.
Name
Factory
Setting
Change
during
Operation
Control Methods
V/f
Open
Loop
Vector
Closed
Loop
Vector
Closed
Loop
Vector
(PM)
L8-07 Output open-phase detection selection 2 No A A A A
L8-20 Output phase loss detection time 0.2 sec No A A A A
Parameter
No.
Name
Factory
Setting
Change
during
Operation
Control Methods
V/f
Open
Loop
Vector
Closed
Loop
Vector
Closed
Loop
Vector
(PM)
L8-09 Ground detection selection 1 No A A A A

Omron VARISPEED L7 Specifications

General

Brand	Omron
Model	VARISPEED L7
Category	Inverter
Language	English