Omron K6EL User manual

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(c)Copyright OMRON Corporation 2007 All Rights Reserved.
Ground Fault Relay
K6EL
Economical, Compact, High-performance,
DIN 48 u48-mm Ground Fault Relay for Low
Voltages
• Performs continuous monitoring and detection of ground faults
in low-voltage circuits due to the deterioration of insulation in
electrical devices.
• Higher reliability ensured with improved resistance to high-fre-
quency noise when used for inverter loads.
• Remote monitoring of cubicles is possible with automatic-reset
models.
• Ground Fault Relays and through-type ZCTs (zero-phase cur-
rent transformers) are mutually compatible.
• The through-type ZCTs are equipped with test terminals, allow-
ing operation tests for Ground Fault Relays to be performed with
ease.
• Series now includes K6EL-R50, which operates at
50 mA r10%.
Model Number Structure
■Model Number Legend
1. Ground Fault Relay
2. Operating Time and Reset Method
None: 0.1 s manual reset
A: 0.3/0.8 s (switchable) manual reset
R: 0.5 s automatic reset
3. Sensed Current
30: 30 mA (fixed)
50: 50 mA/150 mA (switchable)
100: 100 mA/200 mA (switchable)
200: 200 mA/500 mA (switchable)
500: 500 mA/1,000 mA (switchable)
Ordering Information
■List of Models
Manual-reset Ground Fault Relays
Automatic-reset Ground Fault Relays
Note: Operating Error
50-mA tap: r10%
150-mA tap: r20%
231
K6EL-@@
Type Operating time
Type High-sensitivity
models Medium-sensitivity models
Sensed current 30 mA (fixed) 100 mA/200 mA
(switchable) 200 mA/500 mA (switchable) 500 mA/1,000 mA (switchable)
High-speed models Less than 0.1 s K6EL-30 K6EL-100 K6EL-200 K6EL-500
Delayed models 0.3/0.8 s (switchable) --- K6EL-A100 K6EL-A200 K6EL-A500
Type Operating time Type High-sensitivity models Medium-sensitivity models Sensed current 50 mA/150 mA (switchable) 500 mA/1,000 mA (switchable)
Delayed models Less than 0.5 s --- K6EL-R500
K6EL-R50 (See note.) ---

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K6EL
ZCTs (Zero-phase Current Transformers)
■Ground Fault Relay and ZCT Combinations
(OK: Compatible)
Note: 1. “OK” indicates groupings that can be combined freely.
2. Combinations with the OTG-LA@@ are also possible.
■Options
Flush Mounting Adapters Front Cover
Specifications
■Ground Fault Relay Ratings
Note: 1. The K6EL-R50 requires a 100-VAC control power supply.
2. Only the K6EL-R50 can be switched between 50 mA r10% and 150 mA r20%.
Rated current Type Indoor through-type models Indoor separate-type models Sensed current Model Diameter of through-hole Model Diameter of through-hole
50 A OTG-L21 21 mm --- ---
100 A OTG-L30 30 mm --- 22 mm
200 A OTG-L42 42 mm OTG-CN52 52 mm
400 A OTG-L68 68 mm OTG-CN77 77 mm
600 A OTG-L82 82 mm OTG-CN112 112 mm
1,000 A OTG-L156 156 mm --- ---
ZCT Ground Fault Relay K6EL-30 K6EL-R50 K6EL-100, -200, -500, -R500 K6EL-A100, -A200, -A500
OTG-L21 (50 A) OK OK
OTG-L30 (100 A) OK OK
OTG-L42 (200 A) OK OK
OTG-L68 (400 A) --- OK
OTG-L82 (600 A) --- OK
OTG-L156 (1,000 A) --- OK
OTG-CN52 (200 A) --- OK
OTG-CN77 (400 A) --- OK
OTG-CN112 (600 A) --- OK
Model
Y92F-30
Y92F-71
Model
Y92A-48B (Hard Cover)
Y92A-48D(Soft Cover)
Item Type High-speed models Delayed models Delayed high-sensitivity models
Control power supply 100/110 VAC or 200/220 VAC, 50/60 Hz (same for all) (See note 1.) 100 VAC
Rated current Depends on the ZCT
Sensed current 50% to 100% of the rated sensed current (50 mAr10%, 150 mA r20%) (See note 2.)
Non-operating current 0% to 50% of the rated sensed current
Rated short-time current 2,500 A
Ground fault indication method LED (red)
Test method Relay operation confirmed using a test button. (Independent of ZCT connection.)
Reset method Manual Either press the reset button or turn the control power supply OFF and ON again.
Automatic Automatically resets when the ground fault is cleared.
Built-in
contacts Contact form SPDT+SPST-NO SPDT
Carrying current 5A 3A
Rated load cosI= 1 cosI= 0.4 (L/R = 7 ms) cosI= 1
240 VAC 5 A 2 A 220 VAC, 3 A
110 VDC 0.3 A 0.2 A
30 VDC 5 A 3 A
Power (VA) consumption 3VAmax.
Weight Approx. 110 g

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K6EL
■Ground Fault Relay Characteristics
Note: The range for an operating time of 0.3 s is 0.15 to 0.45 s and the range for an operating time of 0.8 s is 0.6 to 1.2 s.
■ZCT (Zero-phase Current Transformer)
Note: Do not connect ZCT output terminals k and l to ground. Doing so may result in damage to the Relay.
Item Type High-speed models Delayed models Delayed high-sensitivity models
Operating time Less than 0.1 s 0.3 s/0.8 s (switchable) Less than 0.5 s
Inertial non-operating
time --- 0.1 s when set to 0.3 s 0.5 s when set to 0.8 s
Control power supply
range 80% to 110% of the control power supply voltage
Operatingtemperature
range 10 to 55 qC (with no icing)
Operating humidity
range 45% to 85% (with no condensation)
Insulation resistance 5M:min. at 500 VDC (between charged parts and the mounting panel)
Dielectric strength 1,500 VAC, 50/60 Hz for 1 min (between charged parts and the mounting panel)
Lightning impulse
dielectric strength 1.2/50 Ps, 7,000 V (between control power supply terminals)
Lightning impulse
operation failure 1.2/50 Ps, 7,000 V (primary side of ZCT)
Vibration resistance Destruction: 16.7 Hz, 4-mm double amplitude for 1 min
Shock resistance 98 m/s2
Item Structure Indoor through-type models Indoor separate-type models
Model OTG-L21 OTG-L30 OTG-L42 OTG-L68 OTG-L82 OTG-L156 OTG-CN52 OTG-CN77 OTG-
CN112
Rated current 50 A 100 A 200 A 400 A 600 A 1,000 A 200 A 400 A 600 A
Diameter of
through-hole 21 mm 30 mm 42 mm 68 mm 82 mm 156 mm 52 mm 77 mm 112 mm
Rated voltage 600 VAC max., 50/60 Hz, single-phase/three-phase
Output terminal
polarity None (The ZCT’s output terminals k and l can be connected to either input terminals 3 or 4 of the Relay.) (See note.)
Insulation
resistance 100 M:min. (between charged metal parts and ground)
Dielectric strength 2,200 VAC, 50/60 Hz for 1 min (between charged metal parts and ground)
Ambient operating
temperature 10 to 60 qC (with no icing)
Weight Approx.
90 g
Approx.
130 g
Approx.
230 g
Approx.
480 g
Approx.
700 g
Approx.
6.6 kg
Approx.
1.3 kg
Approx.
2.5 kg
Approx.
3.5 kg

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K6EL
Internal Block Diagram
Nomenclature
Connections
Note: 1. The K6EL-R50 does not have terminals 6 and 7.
2. The K6EL-R500 and K6EL-R50 do not have terminal 2. (They cannot be used at 200/220 V.)
Input
protection
circuit
Operating
value setting
circuit
Shock-wave
absorption
circuit
Amplifier
circuit
Operating time
setting circuit
Switching
circuit
Test button
Power
supply
circuit
Power supply indicator (green)
Ground fault
indicator (red)
X/a
Sensitivity
selection switch
(not provided on
the K6EL-30)
From OTG ZCT
3
9
8
11
6
7
2
1
10
4X
X/c
Reset button
Operating time
selection switch
Delayed models only
Operation at
100/110 V
(See note 1.)
(See note 2.)
Operation at
200/220 V
Note: 1. The K6EL-R50 does not
have terminals 6 and 7.
2. The K6EL-R500 and K6EL-
R50 do not have terminal 2.
(They cannot be used at 200/
220 V.)
POWER
SENSITIVITY
LEAKED
200
mA
100
mA
RESET
K6EL-A100
TEST
0.3S 0.8S
OPERATING TIME
EARTH LEAKAGE
RELAY
Ground fault indicator (red)Power supply indicator (green)
Test button (red)
Sensitivity selection switch
(not provided on the K6EL-30)
Reset button (black)
(not provided on automatic-reset models)
Operating time selection switch
(delayed models only)
6
5
4
3
21
11 10
9
8
7
100 VAC
200 VAC Control power
supply
From ZCT
(See note 1.)
(See note 2.)
100 VAC
200 VAC
From ZCT
From ZCT
5678
2 1 11 10
3
4
9
100 VAC
200 VAC Control power supply
From ZCT
From ZCT
1110 1 2
7865
93
4
Ground Fault Relay
(from Pin Side) Ground Fault Relay with P3GA-11 (from Terminal Side) Ground Fault Relay with P2CF-11 (from Terminal Side)

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K6EL
Connection Examples
Installation on the Electrical Path Installation on a Ground Bus Bar
Note: When not using the kt and lt terminals (test terminals), leave
them unconnected. The Relay may not be able to attain its
performance characteristics if used with the kt and lt terminals
connected.
Dimensions
Note: All units are in millimeters unless otherwise indicated.
Ground Fault Relay
Load
Y/b
Auxiliary relay
Alarm buzzer
100/110 VAC
200/220 VAC
Y
BZ
Transformer
Molded case
circuit-breaker
6
5
4
3
21
11 10
9
8
7
kt
kl
lt
OTG ZCT
K6EL
Ground
Fault Relay
ZCT
Do not, under any circumstances, connect the k and l
lines to ground.
100/110 VAC
200/220 VAC
Auxiliary relay
Alarm buzzer
Y
BZ
Load
Y/b
Transformer
Molded case
circuit-breaker
6
5
4
3
21
11 10
9
8
7
lt
l
k
kt
OTG ZCT
K6EL Ground
Fault Relay
ZCT
Ground bus bar
48
48
0.7 13.6
44.8 × 44.8
78
63.7
6
1
Applicable Connecting Sockets
P2CF-11 Front Connecting Socket
P3GA-11 Back Connecting Socket
PL11 Back Connecting Socket

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K6EL
Dimensions with Adapter Mounted
Dimensions for Socket Mounting
Connecting Sockets
58
48
791.4
15 Panel P3GA-11
Back Connecting Socket R0.5 max. 45 +0.5
0
45 +0.5
0
Note: Recommended panel
thickness: 1 to 3.2 mm.
Mounting Hole
Cutout Dimensions
Panel
P3GA-11
Back Connecting Socket
91.4
56
68
45±0.2
45±0.2
50±0.2
58
R0.5 max. 45 +0.5
0
55 +0.5
0
Mounting Hole
Cutout Dimensions
Note: Recommended panel
thickness: 1 to 3.2 mm.
Y92F-30 Flush Mounting Adapter
(Sold Separately)
Y92F-71 Flush Mounting Adapter
(Sold Separately)
P2CF-11 (sold separately) PL11
(sold separately)
103
K6EL
77
7
16
K6EL
Y92H-1 Hook
Y92F-30
K6EL
+
Adapter
P3GA-11
91.4
(sold separately)
Note: The same dimensions apply
when using the Y92F-71 Adapter.
Eleven, M3.5×7.5
sems screws 7.8
Two, 4.5-dia.
holes
35.4
70 max.
50 max.
4
31.2 max.
4.53
8 7 6 5
10 11 1 2
4
9 3
Two, 4.5-dia. holes
40±0.2
Terminal Arrangement
(Top View) Mounting Holes
25.6
6.2
16.3
4.5
45
45
27 dia.
86
5
4
3
2 1 11 10
9
7
Terminal Arrangement
(Top View)
P2CF-11 Front Connecting Socket
P3GA-11 Back Connecting Socket

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K6EL
Front Cover
ZCT
3.5
51 max. 40
35 max.
30 dia.
41
Approx. 20.5
Two, 2-dia. holes
3.9
567
8
9
10
1
11
2
4
3
31 dia.
holes 40±0.3
Two, 3.5-dia. holes or
two, M3 socket mounting holes
Terminal Arrangement
(Bottom View) Mounting Holes
PL11 Back Connecting Socket
Model
Y92A-48B (Hard Cover)
Y92A-48D (Soft Cover)
Two, 5-dia. holes or
two, M4 screw holes
131
143
13
(mounting pitch)
136
68 dia.
118 17
31
9.3
11
6.1
Mounting Hole
Cutout Dimensions
Two, 5-dia. holes or
two, M4 screw holes
97
107
97
(mounting pitch)
25
109
88
17
42 dia.
11
9.3
5.2 Mounting Hole
Cutout Dimensions
kt k l lt
9.3
11
50
6
6
66
74
64
5.2 20
20
13
Label and caution
Terminal symbols
(protrude 0.3 mm)
Nameplate
21 dia.
Two, 5.5-dia. holes or
two, M5 screw holes
64
Mounting Hole
Cutout Dimensions
kt k l lt
9.3
11
63
6
6
79
86
76
5.2 20
20
13
30 dia. 76
Terminal symbols
(protrude 0.3 mm)
Nameplate
Mounting Hole
Cutout Dimensions
Two, 5.5-dia. holes or
two, M5 screw holes
Indoor Through-type Models
OTG-L21 (50 A)
OTG-L30 (100 A)
OTG-L42 (200 A)
OTG-L68 (400 A)

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K6EL
Two, 5-dia. holes or
two, M4 screw holes
160
6.2
11
9.3
138
158
82 dia.
172
160 (mounting pitch)
33
28
17 Mounting Hole
Cutout Dimensions
9
263
156 dia.
138
3.2
270
230 60
M5 terminal screws
13090
20 40
L
230
90
Mounting Hole
Cutout Dimensions
Four, 8.5-dia. holes or
four, M8 screw holes
K
K
M4 terminal screws
79
141
52 dia.
170
200
30
7
170
Mounting Hole
Cutout Dimensions
Two, 6.5-dia. holes or
two, M6 screw holes
OTG-L82 (600 A)
OTG-L156 (1,000 A)
Indoor Separate-type Models
OTG-CN52 (200 A)

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K6EL
■Maximum Wire Sizes for ZCTs
Wire/cable 600-V vinyl-insulated wire (IV) Cable (VVR)
Model Rated
current Through-hole diameter 2-wire 3-wire 2-wire 3-wire
OTG-L21 50 A 21 dia. 22 mm214 mm28 mm25.5 mm2
OTG-L30 100 A 30 dia. 60 mm238 mm238 mm238 mm2
OTG-L42 200 A 42 dia. 100 mm2100 mm2100 mm260 mm2
OTG-L68 400 A 68 dia. 400 mm2325 mm2325 mm2250 mm2
OTG-L82 600 A 82 dia. 500 mm2500 mm2400 mm2400 mm2
OTG-L156 1,000 A 156 dia. 500 mm2500 mm21,000 mm21,000 mm2
OTG-CN52 200 A 52 dia. 200 mm2200 mm2150 mm2100 mm2
OTG-CN77 400 A 77 dia. 500 mm2400 mm2400 mm2325 mm2
OTG-CN112 600 A 112 dia. 500 mm2500 mm21,000 mm21,000 mm2
K
K
M4 terminal screws
84
77 dia.
157
230
195
70 53
7
195
53
Mounting Hole
Cutout Dimensions
Four, 6.5-dia. holes or
four, M6 screw holes
K
K
260
225
70 53
7
112 dia.
M4 terminal screws
107
200
225
53
Mounting Hole
Cutout Dimensions
Four, 6.5-dia. holes or
four, M6 screw holes
OTG-CN77 (400 A)
OTG-CN112 (600 A)

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K6EL
Test Circuit
Select the resistance R shown in the test circuit diagram according to
the K6EL’s rated sensed current. Change the current using the slidac
and ascertain the K6EL’s operating value each time by reading the
ammeter.
For example, R could take the values shown below:
30 mA: 3.3 k:, 6 W
100 mA: 1 k:, 20 W
200 mA: 500 :, 50 W
500 mA: 200 :, 100 W
1,000 mA: 100 :, 200 W
Safety Precautions
■Correct Use
Installation and Wiring
•Do not, under any circumstances, connect the ZCT’s output termi-
nals k and l to ground. Doing so may result in damage to the
Relay’s internal circuits.
•Pass the primary conductor through the ZCT once.
•The Relay detects ground faults in internal wiring of devices due to
insulation deterioration and so install the ZCT as close to the power
supply side as possible.
ZCT Installation
•Install the ZCT at an outdoor cable inlet or on a ground bus bar at a
location allowing easy inspection.
•When installing on the electrical path, use a ZCT with a value
greater than the electrical path’s rated current.
•If the secondary lines run in parallel to a circuit carrying a large cur-
rent, either separate the lines as far as possible or use a shield line.
•When installing a separate-type ZCT with current flowing along the
primary conductors, short the secondary terminals using clips or
some other method.
Switching the Sensed Current
1. With the K6EL-@100, 200, 500, R50, and R500, the sensed cur-
rent can be switched using a flat-bladed screwdriver.
2. The sensed current for the K6EL-30 is fixed and hence cannot be
switched.
Switching the Operating Time
1. With the K6EL-A100, A200, and A500, the operating time can be
switched using a flat-bladed screwdriver.
2. The operating time for the K6EL-30, 100, 200, 500, R50, and
R500 is fixed and hence cannot be switched.
Testing
•If the ground fault indicator (red) lights when the Relay’s test button
is pressed, it means that the internal circuits are operating nor-
mally.
•To make an overall test, run a simulated ground fault current.
Resetting
•Once manual-reset models operate, they continue to operate until
they are reset. Reset them either by pressing the reset button
(black) or by turning the control power supply OFF and ON again.
•Automatic-reset models reset automatically when the ground fault
is cleared (i.e., the current drops below the sensed current).
100 VAC
lt
l
k
kt
OTC
Switch
Slidac
mA
K6EL
Ammeter
R
ZCT
Run the secondary lines
close to each other.
K6EL
Separate by 20 cm min.
Primary conductor
Circuit carrying large curren
t
Sensed current selection switch
Operating time selection switch

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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 klt
l
Ig
K6EL
OTG ZCT
Isolating
transformer
Resistor (R) or
capacitor (C)
2It
V
R= (Ω)
R
5V2
P= (W)
2Rg + R
V
Ig= (A) R
V
Ig= (A)
2πfV
2It
C= (F)
(2Rg)2+ ( )2
1
2πfC
V
Ig= (A) Ig = 2πfCV (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.

2007.3
OMRON Corporation
Industrial Automation Company
http://www.ia.omron.com/ (c)Copyright OMRON Corporation 2007 All Rights Reserved.
In the interest of product improvement, specifications are subject to change without notice.
Read and Understand This Catalog
Please read and understand this catalog before purchasing the products. Please consult your OMRON representative if you have any questions or
comments.
Warranty and Limitations of Liability
WARRANTY
OMRON's exclusive warranty is that the products are free from defects in materials and workmanship for a period of one year (or other period if
specified) from date of sale by OMRON.
OMRON MAKES NO WARRANTY OR REPRESENTATION, EXPRESS OR IMPLIED, REGARDING NON-INFRINGEMENT, MERCHANTABILITY, OR
FITNESS FOR PARTICULAR PURPOSE OF THE PRODUCTS. ANY BUYER OR USER ACKNOWLEDGES THAT THE BUYER OR USER ALONE HAS
DETERMINED THAT THE PRODUCTS WILL SUITABLY MEET THE REQUIREMENTS OF THEIR INTENDED USE. OMRON DISCLAIMS ALL OTHER
WARRANTIES, EXPRESS OR IMPLIED.
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OMRON SHALL NOT BE RESPONSIBLE FOR SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES, LOSS OF PROFITS, OR COMMERCIAL
LOSS IN ANY WAY CONNECTED WITH THE PRODUCTS, WHETHER SUCH CLAIM IS BASED ON CONTRACT, WARRANTY, NEGLIGENCE, OR
STRICT LIABILITY.
In no event shall responsibility of OMRON for any act exceed the individual price of the product on which liability is asserted.
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OMRON'S ANALYSIS CONFIRMS THAT THE PRODUCTS WERE PROPERLY HANDLED, STORED, INSTALLED, AND MAINTAINED AND NOT
SUBJECT TO CONTAMINATION, ABUSE, MISUSE, OR INAPPROPRIATE MODIFICATION OR REPAIR.
Application Considerations
SUITABILITY FOR USE
OMRON shall not be responsible for conformity with any standards, codes, or regulations that apply to the combination of products in the customer's
application or use of the product.
At the customer's request, OMRON will provide applicable third party certification documents identifying ratings and limitations of use that apply to the
products. This information by itself is not sufficient for a complete determination of the suitability of the products in combination with the end product,
machine, system, or other application or use.
The following are some examples of applications for which particular attention must be given. This is not intended to be an exhaustive list of all possible
uses of the products, nor is it intended to imply that the uses listed may be suitable for the products:
• Outdoor use, uses involving potential chemical contamination or electrical interference, or conditions or uses not described in this catalog.
• Nuclear energy control systems, combustion systems, railroad systems, aviation systems, medical equipment, amusement machines, vehicles, safety
equipment, and installations subject to separate industry or government regulations.
• Systems, machines, and equipment that could present a risk to life or property.
Please know and observe all prohibitions of use applicable to the products.
NEVER USE THE PRODUCTS FOR AN APPLICATION INVOLVING SERIOUS RISK TO LIFE OR PROPERTY WITHOUT ENSURING THAT THE
SYSTEM AS A WHOLE HAS BEEN DESIGNED TO ADDRESS THE RISKS, AND THAT THE OMRON PRODUCT IS PROPERLY RATED AND
INSTALLED FOR THE INTENDED USE WITHIN THE OVERALL EQUIPMENT OR SYSTEM.
Disclaimers
CHANGE IN SPECIFICATIONS
Product specifications and accessories may be changed at any time based on improvements and other reasons.
It is our practice to change model numbers when published ratings or features are changed, or when significant construction changes are made.
However, some specifications of the product may be changed without any notice. When in doubt, special model numbers may be assigned to fix
or establish key specifications for your application on your request. Please consult with your OMRON representative at any time to confirm actual
specifications of purchased product.
DIMENSIONS AND WEIGHTS
Dimensions and weights are nominal and are not to be used for manufacturing purposes, even when tolerances are shown.
ERRORS AND OMISSIONS
The information in this catalog has been carefully checked and is believed to be accurate; however, no responsibility is assumed for clerical,
typographical, or proofreading errors, or omissions.
PERFORMANCE DATA
Performance data given in this catalog is provided as a guide for the user in determining suitability and does not constitute a warranty. It may represent
the result of OMRON’s test conditions, and the users must correlate it to actual application requirements. Actual performance is subject to the OMRON
Warranty and Limitations of Liability.
PROGRAMMABLE PRODUCTS
OMRON shall not be responsible for the user's programming of a programmable product, or any consequence thereof.
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