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11
(c)Copyright OMRON Corporation 2007 All Rights Reserved.
K6EL
Q&A
Q:
How does the K6EL operate when used for inverter loads (e.g., inverter motors and inverter air conditioners)?
A:
The influence of high-frequency noise generated by the inverter has been reduced by combining a special ground
fault relay IC and a capacitor for cutting out high-frequencies. The possibility of malfunctions due to the influence
of the inverter is much less than with the existing ESA Ground Fault Relay.
Q:
What connection method should be used for ungrounded electrical paths?
A:
With ungrounded electrical paths, connect the capacitor or resistor for detection in the way shown in the diagram.
The table shows the formulas for calculating the resistance or capacitance as well as the formulas for calculating
ground currents for complete ground faults. (Depending on the location, the allowable ground fault current may be
restricted. In this case, use values of R and C that do not exceed the restrictions.)
R
S
T
K6EL
Inverter
Rg
M
Connection method
Formula for resistor or capacitor
Formula for ground
current
Formula for
safety ground
fault
Single-
phase
electrical
path
Resistor:
It: Ground Fault
Relay’s set
value
V: Line voltage
f: Frequency
P: Allowable
power for the
resistor used
(A tolerance is
included in the
formulas on the
left.)
Capacitor:
Dielectric strength
> 2 V (V)
Y/b
Load
Rg
Y
kt
k lt
l
Ig
K6EL
OTG ZCT
Isolating
transformer
Resistor (R) or
capacitor (C)
2It
V
R=
(
Ω
)
R
5V
2
P=
(W)
2Rg + R
V
Ig=
(A)
R
V
Ig=
(A)
2
π
fV
2It
C=
(F)
(2Rg)
2
+ ( )
2
1
2
π
fC
V
Ig=
(A)
Ig = 2
π
fCV (A)
In the interest of product improvement, specifications are subject to change without notice.
ALL DIMENSIONS SHOWN ARE IN MILLIMETERS.
To convert millimeters into inches, multiply by 0.03937. To convert grams into ounces, multiply by 0.03527.
