Omron K8AK-AS1 24VAC/DC User manual

1
Single-phase Current Relay
K8AK-AS
Ideal for current monitoring for
industrial facilities and equipment.
• Monitor for overcurrents or undercurrents.
• Use commercially available CTs (CT current on secondary
side: 0 to 1 A or 0 to 5 A).
• Manual resetting and automatically resetting supported by one
Relay.
• Startup lock and operating time can be set separately.
• One SPDT output relay, 5 A at 250 VAC (resistive load).
• Output relay can be switched between normally open and
normally closed.
• Output status can be monitored using LED indicator.
• Inputs are isolated from the power supply.
Ordering Information
List of Models
*1 The K8AK-AS3 is designed to be used in combination with an OMRON K8AC-CT200L Current Transformer (CT). (Direct input is not possible.)
Accessory (Order Separately)
●OMRON CT ●Commercially Available CTs*
* If you use a commercially available CT, do not exceed the overload
capacity of the K8AK-AS2.
Refer to Safety Precautions for the K8AK Series on page 86.
Refer to page 13 for commonly asked questions.
For the most recent information on models that have been certified for
safety standards, refer to your OMRON website.
Setting range Supply voltage Model
2 to 20 mA AC/DC,
10 to 100 mA AC/DC,
50 to 500 mA AC/DC
24 VAC/DC K8AK-AS1 24 VAC/DC
100 to 240 VAC K8AK-AS1 100-240 VAC
0.1 to 1 A AC/DC,
0.5 to 5 A AC/DC,
0.8 to 8 A AC/DC
24 VAC/DC K8AK-AS2 24 VAC/DC
100 to 240 VAC K8AK-AS2 100-240 VAC
10 to 100 A AC*,
20 to 200 A AC*
24 VAC/DC K8AK-AS3 24 VAC/DC
100 to 240 VAC K8AK-AS3 100-240 VAC
Appearance Input range Applicable
Relay Model
10 to 100 A AC,
20 to 200 A AC K8AK-AS3 K8AC-CT200L
Appearance CT current on secondary
side Applicable Relay
0 to 1 A AC,
0 to 5 A AC K8AK-AS2

K8AK-AS
2
Ratings and Specifications
Input Range
*1 The range is selected using connected terminals.
*2 The K8AK-AS3 is designed to be used in combination with an OMRON K8AC-CT200L Current Transformer (CT). (Direct input is not possible.)
Ratings
Model Range*1 Connection
terminal Setting range Input impedance Input type Overload capacity
K8AK-AS1
0 to 20 mA AC/DC I1-COM 2 to 20 mA AC/DC,
10 to 100 mA AC/
DC, 50 to 500 mA
AC/DC
Approx. 5 ΩDirect input
Continuous input at
120% of maximum input
1 s at 150%
0 to 100 mA AC/DC I2-COM Approx. 1 ΩDirect input
0 to 500 mA AC/DC I3-COM Approx. 0.2 ΩDirect input
K8AK-AS2
0 to 1 A AC/DC I1-COM
0.1 to 1 A AC/DC,
0.5 to 5 A AC/DC,
0.8 to 8 A AC/DC
Approx. 0.12 Ω
(Load : 0.5 VA) Direct input
or commer-
cially avail-
able CT
0 to 5 A AC/DC I2-COM Approx. 0.02 Ω
(Load : 1.5 VA)
0 to 8 A AC/DC I3-COM Approx. 0.02 Ω
(Load : 3 VA) ---
K8AK-AS3
0 to 100 A AC I2-COM
10 to 100 A AC*2,
20 to 200 A AC*2
--- OMRON CT Continuous input at 120% with
an OMRON CT (K8AC-
CT200L).
30 s at 200%
1 s at 600%
* CT capacity on primary side.
0 to 200 A AC I3-COM --- OMRON CT
Power supply voltage Isolated power supply 24 VAC/DC
100 to 240 VAC
Power consumption 24 VAC/DC: 2.0 VA/1.1 W max.
100 to 240 VAC: 4.6 VA max.
Operating value setting range (SV)
10% to 100% of the maximum value of the setting range
K8AK-AS1: 2 to 20 mA AC/DC
10 to 100 mA AC/DC
50 to 500 mA AC/DC
K8AK-AS2: 0.1 to 1 A AC/DC (Compatible with commercially available CTs.)
0.5 to 5 A AC/DC (Compatible with commercially available CTs.)
0.8 to 8 A AC/DC
K8AK-AS3: When used with the OMRON CT (K8AC-CT200L).
10 to 100 A AC
20 to 200 A AC
Operating value 100% operation at set value
Reset value setting range (HYS.) 5% to 50% of operating value
Reset method Manual reset/automatic reset (switchable)
Note: Manual reset: Turn OFF power supply for 1 s or longer.
Operating time setting range (T) 0.1 to 30 s
Startup lock time setting range (LOCK)
Note: Enabled only for overcurrent operation.
0 to 30 s
(The startup lock timer starts when the input has reached approximately 30% or more of the set value.)
Note: Enabled only for overcurrent operation.
Indicators Power (PWR): Green, Relay output (RY): Yellow, Alarm outputs (ALM): Red
Input impedance Refer to Input Range on this page.
Output relays One SPDT relay (NO/NC switched using DIP switch.)
Output relay ratings
Rated load
Resistive load
5 A at 250 VAC
5 A at 30 VDC
Maximum contact voltage: 250 VAC or 30 VDC
Max. switching current: 5 A
Maximum switching capacity: 1,250 VA, 150 W
Mechanical life: 10 million operations min.
Electrical life: 5 A at 250 VAC or 30 VDC: 50,000 operations
3 A at 250 VAC/30 VDC:100,000 operations
Ambient operating temperature −20 to 60°C (with no condensation or icing)
Storage temperature −25 to 65°C (with no condensation or icing)
Ambient operating humidity 25% to 85% (with no condensation)
Storage humidity 25% to 85% (with no condensation)
Altitude 2,000 m max.
Terminal screw tightening torque 0.49 N·m

K8AK-AS
3
Specifications
Terminal wiring method
Recommended wire
Solid wire: 2.5 mm2
Twisted wires: AWG16, AWG18
Note: 1. Ferrules with insulating sleeves must be used with twisted wires.
2. Two wires can be twisted together.
Recommended ferrules
Al 1,5-8BK (for AWG16) manufactured by Phoenix Contact
Al 1-8RD (for AWG18) manufactured by Phoenix Contact
Al 0,75-8GY (for AWG18) manufactured by Phoenix Contact
Case color N1.5
Case material PC and ABS
Weight Approx. 150 g
Mounting Mounts to DIN Track
Dimensions 22.5 × 90 × 100 mm (W×H×D)
Allowable operating voltage range 85% to 110% of power supply voltage
Allowable operating frequency range 50/60 Hz ±5 Hz
Input frequency range K8AK-AS1 and K8AK-AS2: DC input or AC input (45 to 65 Hz)
K8AK-AS3: AC input (45 to 65 Hz)
Overload capacity
K8AK-AS1 and K8AK-AS2: Continuous input at 120% of maximum input, 1 s at 150%
K8AK-AS3: Continuous input at 120%, 30 s at 200%, and 1 s at 600% with an OMRON CT (K8AC-CT200L)
Note: Overload capacity of primary side of CT.
Repeat error Operating value ±0.5% full scale (at 25°C and 65% humidity, rated power supply voltage, DC or 50/60 Hz sine wave input)
Operating time ±50 ms (at 25°C and 65% humidity, rated power supply voltage)
Applicable
standards
Conforming
standards
EN60947-5-1
Installation environment (pollution level 2, installation category III)
EMC EN60947-5-1
Safety standards UL 508 (Recognition), Korean Radio Waves Act (Act 10564), CSA: CAN/CSA C22.2 No.14,
CCC: GB14048.5
Insulation resistance
20 MΩ min.
Between external terminals and case
Between power supply terminals and input terminals
Between power supply terminals and output terminals
Between input terminals and output terminals
Dielectric strength
2,000 VAC for one minute
Between external terminals and case
Between power supply terminals and input terminals
Between power supply terminals and output terminals
Between input terminals and output terminals
Noise immunity 1,500 V power supply terminal common/normal mode
Square-wave noise of ±1 μs/100 ns pulse width with 1-ns rise time
Vibration resistance Frequency 10 to 55 Hz, 0.35-mm single amplitude, acceleration 50 m/s2
10 sweeps of 5 min each in X, Y, and Z directions
Shock resistance 150 m/s2, 3 times each in 6 directions along 3 axes
Or 100 m/s2 for relay contacts.
Degree of protection Terminals: IP20

K8AK-AS
4
Connections
Wiring Diagram
●Overcurrent Operation Diagram
(Output Relay Drive Method: Normally Open)
DIP switch setting: SW3 OFF.
●Undercurrent Operation Diagram
(Output Relay Drive Method: Normally Closed)
DIP switch setting: SW3 ON.
Note: 1. The K8AK-AS3 is designed to be used in combination with
the OMRON K8AC-CT200L Current Transformer (CT).
2. There is no polarity when a DC current input is used.
3. Refer to the Setting Ranges and Wiring Connections as the
explanation of current input l1, l2, and l3 terminal.
AS (I3 terminal)
010
10
60
50
40
30
20
515
Distance between products d [mm]
I = 3 A I = 5 A
I = 1 A
I = 8 A
Ambient temperature [°C]
K8AK
No.3
K8AK
No.2
K8AK
No.1
K8AK
No.4
K8AK
No.5
DIN Track Distance between products: d
Sample: K8AK-AS
Applied voltage: 240 VAC
Mounting distances: 0, 5, and 10 mm min.
Test method
●Relationship of Mounting Distance between
K8AK-AS Relays and Input Current
(Reference Values)
The following diagram shows the relationship between the mounting
distances and the input current. If the relay is used with an input
current that exceeds these values, the temperature of the K8AK may
rise and shorten the life of the internal components.
Power supply
voltage
Set value
Input
Alarm indicator
Relay 11-14
Relay 11-12
Hysteresis
(−5% to 50% of operating value)
Lit
Flashing
T: Operating time (0.1 to 30 s)
Lock: Startup lock time (0 to 30 s)
LOCK
T
Power supply
voltage
Set value
Input
Relay 11-14
Relay 11-12
Alarm indicator
Lit
Flashing Hysteresis
(5% to 50% of operating value)
TT: Operating time (0.1 to 30 s)
Single-phase power
A1
Power supply
voltage A2
Current
input
I1
I2
I3
COM
14
Signal
output
12
A1
A2
Current
input
I1
I2
I3
COM
14
Signal
output
12
Relay
signal
output
or
Load
Single-phase power
Relay
signal
output
Load
1111
Power supply
voltage

K8AK-AS
5
Nomenclature
Front ●Indicators
●Setting Knobs
Note: 1. Use either a solid wire of 2.5 mm
2 maximum or a ferrule with
insulating sleeve for the terminal connection.
The length of the exposed current-carrying part inserted into
the terminal must be 8 mm or less to maintain dielectric
strength after connection.
Recommended ferrules
Phoenix Contact
•Al 1,5-8BK (for AWG16)
•Al 1-8RD (for AWG18)
•Al 0,75-8GY (for AWG18)
2. Tightening torque: 0.49 N·m
Power indicator
Relay status indicator
Current knob (SV)
Hysteresis knob (HYS.)
Operating time knob (T)
Startup lock time knob
(LOCK)
Alarm indicator
Terminal block
(See notes 1 and 2.)
Terminal block
(See notes 1 and 2.)
Item Meaning
Power indicator
(PWR: Green) Lit when power is being supplied.
Relay status indicator
(RY: Yellow) Lit when relay is operating.
Alarm indicator
(ALM: Red)
Lit when there is an overcurrent or un-
dercurrent.
The indicator flashes to indicate the er-
ror status after the input has exceeded
the set value while the operating time
is being clocked.
Item Usage
Current knob (SV) Used to set the current to 10% to 100%
of maximum setting range.
Hysteresis knob (HYS.) Used to set the rest value to 5% to 50%
of the operating value.
Operating time knob (T) Used to set the operating time to 0.1 to
30 s.
Startup lock time knob
(LOCK)
Used to set the startup lock time to 0 to
30 s.
For 2.5 mm2 or
smaller solid wires For ferrules with
an insulation sleeve.
8 mm max. 8 mm max.

K8AK-AS
6
Operation and Setting Methods
●Setting Ranges and Wiring Connections
●Connections
1. Input
Connect the input between the I1-COM, I2-COM, or I3-COM terminals, according to the input
current. Malfunctions may occur if the input is connected to unused terminals and the Unit will
not operate correctly.
Terminal I1 is not used by the K8AK-AS3.
If using the OMRON K8AC-CT200L CT, connect to terminals k and l on the K8AC-CT200L.
(Terminals kt and lt are not used.)
2. Power Supply
Connect the power supply to terminals A1 and A2.
3. Outputs
Terminals 11, 12, and 14 are the output terminals (SPDT) for overvoltage.
Note: Use the recommended ferrules if using twisted wires.
●DIP Switch Settings
The resetting method, relay drive method, and operating mode are set using the DIP switch located on the bottom of the Unit.
K8AK-AS@ does not use SW1.
●Setting Method
1. Setting Current
The current knob (SV) is used to set the current.
The current can be set to 10% to 100% of the maximum setting range.
Turn the knob while there is an input to the input terminals until the alarm indicator flashes (when the set value and the input have reached the
same level.)
Use this as a guide to set the current.
The maximum setting range will differ depending on the model and the input terminal.
Example: K8AK-AS3 Using Input Terminals I3-COM
The maximum setting range will be 200 A AC and the setting range will be 20 to 200 A.
2. Hysteresis
Hysteresis is set using the hysteresis knob (HYS.)
The setting range is 5 to 50% of the operating value.
Turn the knob while there is an input to the input terminals until the alarm indicator flashes (when the set value and the input have reached the
same level.)
Use this as a guide to set the hysteresis.
Model Setting range Input type Wiring connections
K8AK-AS1
2 to 20 mA AC/DC Direct input I1-COM Note: The DC input terminals have no polarity.
* The K8AK-AS3 is designed to be used in combination
with the OMRON K8AC-CT200L Current Transformer
(CT). (Direct input is not possible.)
10 to 100 mA AC/DC Direct input I2-COM
50 to 500 mA AC/DC Direct input I3-COM
K8AK-AS2
0.1 to 1 A AC/DC Direct input or
commercially
available CT
I1-COM
0.5 to 5 A AC/DC I2-COM
0.8 to 8 A AC/DC --- I3-COM
K8AK-AS3 10 to 100 A AC* OMRON CT I2-COM
20 to 200 A AC* OMRON CT I3-COM
<For K8AK-AS3>
k
l
Load
Current input
Signal output
K8AC-
CT200L
14
12
A1
A2
I1
I2
I3
11
Relay
signal
output
C (COM)
K8AK-AS3
Single-phase power
Power supply
voltage
DIP switch pins
SW3
ON
OFF
SW2
SW1
SW4
DIP Switch Functions
Note: All pins are set to OFF by default.
Pin
OFF ● ↑
ON ❍ ↓
Resetting method Manual reset
Not used.
●--- ---
Automatic reset ❍--- ---
Relay drive method
Normally open --- ●---
Normally
closed --- ❍---
Operating mode Overcurrent --- --- ●
Undercurrent --- --- ❍
1
OFF
ON
2
3
4

K8AK-AS
7
Example: Maximum of 200 A AC, Current Set Value (SV) of 50%, and Overcurrent Operation
Operation will be at 100 A and resetting at 90 A when the hysteresis (HYS.) is set to 10%.
3. Operating Time
The operating time is set using the operating time knob (T).
The operating time can be set to between 0.1 and 30 s.
Turn the knob while there is an input to the input terminals until the alarm indicator flashes (when the set value and the input have reached the
same level.)
Use this as a guide to set the operating time.
If the input current exceeds (drops lower than) the set value, the alarm indicator will start flashing for the set period and then stay lit.
4. Startup Lock Time
The startup lock time is set using the startup lock time knob (LOCK).
The startup lock time can be set to between 0 and 30 s.
Turn the knob while there is an input to the input terminals until the alarm indicator flashes
(when the set value and the input have reached the same level.)
Use this as a guide to set the startup lock time.
The startup lock time will start when the input current reaches 30% or more of the set value.
Use startup lock time to prevent unwanted operation, e.g., as a result of inrush current.
Dimensions(Unit: mm)
●Single-phase Current Relays
●OMRON CT
Optional Parts for DIN Track Mounting
Inrush current
Current set value
30% of current
set value
Startup lock timer start
Startup lock time
There are no outputs
during this period.
22.5
90
100
72 5
K8AK-AS1
K8AK-AS2
K8AK-AS3
1.8
76
4.1
10
10
5.9
5.2
20
Two M5 screw holes or
two 5.5-dia. holes
57 30 dia.
14.514.5
6
8.5
50
33.5
34.5
81.5
13.5
86
54
63
11 4.7
Four M4 × 6 screws
17
20
9.3
1.7
1.7
9.3
76
Mounting Hole Dimensions
Note: The OMRON Current Transformer (CT) is
designed to be used with the K8AK-AS3.
Use terminals k and l for connections.
(Terminals kt and lt are not used.)
K8AC-CT200L
*Dimensions in parentheses are for the PFP-50N.
4.5
15 25 25
10 10
1,000 (500)*
25 25 15 (5)*
35
±0.3
7.3
±0.15
27
±0.15
1
●DIN Tracks
PFP-100N
PFP-50N

K8AK-AS
8
Checking Operation
Overcurrents
Gradually increase the input from 80% of the set value.
The input will equal the operating value when the input
exceeds the set value and the alarm indicator starts flashing.
Operation can be checked by the relay outputs that will start
after the operating time has passed.
Undercurrent
Gradually decrease the input from 120% of the setting and
check the operation using the same method as for
overcurrent.
Example: Overcurrent Operating Mode, Normally Open Relay Drive,
and an Operating Time of 5 s
Connection Diagram
How to Measure the Operating Time
Overcurrent
Change the input suddenly from 0% to 120% of the set value
and measure the time until the Unit operates.
Undercurrent
Change the input suddenly from 120% to 0% of the set value
and measure the time until the Unit operates.
Monitoring Switch-mode Power Supplies
Switch-mode Power Supplies cannot be monitored. In circuits
with a capacitor input, including switch-mode power supplies,
the input capacitor recharge current flows in pulse form as the
load current. The K8AK-AS@ has a built-in filter as a
countermeasure against high frequencies and cannot be
used to remove pulse current.
Can a motor with a rated current of 5 A be
monitored using the K8AK?
Are there any application precautions?
The K8AK-AS1 and K8AK-AS2 cannot be used with motor
loads. Use the K8AK-AS3 in combination with the K8AC-
CT200L Current Transformer (CT). With motor loads, the
startup current and stall current will cause a current of many
times the rated current to flow. Refer to the following figure for
information on the motor startup current.
For a motor with a rating of 5 A, the startup current will be
approximately 30 A. The startup current will exceed the
overload capacity (rating: 150% for 1 s) of the K8AK-AS1 and
K8AK-AS2 and result in failure of the Relay.
To monitor the motor load, use the K8AK-AS3. (Overload
capacity: 120% of rating for continuous load, 200% of rating for
30 s, and 600% of rating for 1 s).
The K8AK-AS3 has a large input range. Pass the conductors
multiple times through the special CT.
Concept behind Passing Conductor through the CT When
Using the K8AK-AS3
Example: Monitoring Overload of a Motor with a Rated Current of 5 A
K8AK set value:
Overcurrent detection, operating value setting: 25%, operating time: 0.1 s
Startup lock timer: 0.1 to 30 s (Set the timer according to the duration of the
startup current.)
The setting range for the K8AK-AS3 is 10% to 100% of the rated
current (i.e., 10 to 100 A). Pass the conductors through the CT five
times so that at least 10 A of current flows. The input current to the
K8AK will be 25 A (i.e., 5 A x 5 loops).
If a startup current of six times the rated current is generated, it will be
150 A (i.e., 25 A x 6). The overload capacity for the K8AK-AS3 is
200% of the rating for 30 s. The Relay will not fail even if the startup
current continues for 30 s, and it is possible to perform overload
detection.
Questions and Answers
Q
Set value
Current input
Alarm indicator
Relay output
Flashing Lit
5 s
100 VAC
100 VAC
30 Ω0 to 10 A
A
A1
A2
±C 100 V
Variable autotransformer
Input terminals
Power
supply
Output
Cycle counter
400 W (two in parallel)
Q
Q
Q
Motor current (percentage of rated value)
Several seconds to
several tens of seconds
Time from beginning of startup
100%
500%
K8AC-CT200L
Primary-side conductor
To the K8AK-AS3

9
Safety Precautions
Be sure to read the precautions for all models in the website at the following URL: http://www.ia.omron.com/.
Warning Indications
Meaning of Product Safety Symbols
Electrical shock may cause minor injury.
Do not touch terminals while electricity is being supplied.
There is a risk of minor electrical shock, fire, or device failure.
Do not allow any pieces of metal, conductors, or cutting chips
that occur during the installation process to enter the product.
Explosions may cause minor injuries. Do not use the product
in locations with inflammable or explosive gases.
There is a risk of minor electrical shock, fire, or device failure.
Do not disassemble, modify, repair, or touch the inside of the
product.
Loose screws may cause fires. Tighten terminal screws to the
specified torque of 0.49 to 0.59 N·m.
Use of excessive torque may damage the terminal screws.
Tighten terminal screws to the specified torque of 0.49 to 0.59
N·m.
If the setting does not match the element to be monitored, the
product may behave unexpectedly and damage the machine
or cause accidents. Set the K8AK-TH as described below.
•Adjust each set value on the K8AK-TH correctly for the
element that is to be monitored.
•Turn OFF the power to the K8AK-TH before you change
the switch settings on the side panel. The switch
settings made on the side panel take effect when the
power is turned ON.
If the K8AK-TH fails, the monitoring alarms and alarm outputs
may fail to operate. This may result in physical damage to the
facilities, equipment, or other devices that are connected to it.
To reduce this risk, inspect the product regularly. To make the
product fail-safe, take alternative safety measures, such as the
installation of monitoring devices on a separate circuit.
Use of the product beyond its life may result in contact welding
or burning. Make sure to consider the actual operating
conditions and use the product within its rated load and
electrical life count. The life of the output relay varies
significantly with the switching capacity and switching
conditions.
1. Do not use or store the product in the following locations.
•Locations subject to water or oil
•Locations subject to direct radiant heat from heating equipment
•Outdoor locations or under direct sunlight
•Locations subject to dust or corrosive gases (particularly
sulfurizing gases, ammonia, etc.)
•Locations subject to rapid temperature changes
•Locations prone to icing and dew condensation
•Locations subject to excessive vibration or shock
•Locations subject to wind and rain
•Locations subject to static electricity and noise
•Habitats of insects or small animals
2. Use and store the product in a location where the ambient
temperature and humidity are within the specified ranges. If
applicable, provide forced cooling.
3. Mount the product in the correct direction.
4. Check terminal polarity when wiring and wire all connections
correctly. The power supply terminals do not have polarity.
5. Do not wire the input and output terminals incorrectly.
6. Make sure the power supply voltage and loads are within the
specifications and ratings for the product.
7. Make sure the type of the thermocouple matches the input type
that the K8AK-TH is designed for.
8. If you need to extend the length of the lead wires on the
thermocouple to use with the K8AK-TH, make sure to match the
type of thermocouple and always use compensating conductors.
9. To extend the lead wires on the platinum resistance thermometer
that is used with the K8AK-TH, use lead wires with a low
resistance (5 Ω or less per wire), and make the resistance equal
on all three lead wires.
10.Make sure the crimp terminals for wiring are of the specified size.
11.Do not connect anything to terminals that are not being used.
12.Use a power supply that will reach the rated voltage within 1
second after the power is turned ON.
13.After you turn ON the power, it takes 2 seconds for the outputs of
the K8AK-TH to stabilize. Take this time into account when you
design the control panel.
14.Allow at least 30 minutes for the K8AK-TH to warm up. During this
time, the temperature measurements will be incorrect.
15.Keep wiring separate from high voltages and power lines that
draw large currents.
Do not place product wiring in parallel with or in the same path as
high-voltage or high-current lines.
16.Do not install the product near equipment that generates high
frequencies or surges.
17.The product may cause incoming radio wave interference. Do not
use the product near radio wave receivers.
18.Install an external switch or circuit breaker and label it clearly so
that the operator can quickly turn OFF the power supply.
CAUTION
Indicates a potentially hazardous situation
which, if not avoided, may result in minor or
moderate injury or in property damage.
Precautions for Safe
Use
Supplementary comments on what to do or
avoid doing, to use the product safely.
Precautions for
Correct Use
Supplementary comments on what to do or
avoid doing, to prevent failure to operate,
malfunction, or undesirable effects on
product performance.
Used to warn of the risk of electric shock under
specific conditions.
Used for general prohibitions for which there is no
specific symbol.
Used to indicate prohibition when there is a risk of
minor injury from electrical shock or other source if
the product is disassembled.
Used for general mandatory action precautions for
which there is no specified symbol.
CAUTION
Precautions for Safe Use

10
19.When cleaning the product, do not use thinners or solvents. Use
commercial alcohol.
20.Make sure the power and output indicators operate correctly.
Depending on the application environment, the indicators and
other plastic parts may wear prematurely and become difficult to
see. Check and replace these parts regularly.
21.The terminal blocks may heat up to 65°C. Use care when
handling them.
22.Do not use the product if it is accidentally dropped. The internal
components may be damaged.
23.Be sure you understand the contents of this catalog and handle
the product according to the instructions provided.
24.Do not install the product in any way that would place a load on it.
25.When discarding the product, properly dispose of it as industrial
waste.
26.When using the product, remember that the power supply
terminals carry a high voltage.
27.The product must be handled only by trained electrician.
28.Prior to operation, check the wiring before you supply power to
the product.
29.Do not install the product immediately next to heat sources.
Observe the following operating
methods to prevent failure and
malfunction.
1. Use operating power, input power, and other power supplies and
converters with suitable capacities and rated outputs.
2. Allow only qualified personnel to manage or handle the product.
3. Use a precision screwdriver or similar tool to adjust the setting
knobs.
4. The distortion in the input waveform for the K8AK-AS, K8AK-AW,
K8AK-PH, K8AK-PA, K8AK-PM, or K8DS-PH must be 30% max.
If the input waveform is distorted beyond this level, it may cause
unnecessary operation.
Do not use the K8AK-VS or K8AK-VW in circuits with waveform
distortion. Error will be large due to waveform distortion.
5. Error will be large if the K8AK-AS, K8AK-AW, K8AK-VS, or K8AK-
VW is used for thyristor or inverter control.
The K8AK-PH, K8AK-PA, K8AK-PM, K8AK-PW, or K8DS-PH
cannot be used on the secondary side of an inverter. To use the
product on the load side of an inverter, install a noise filter on the
primary side of the inverter.
6. To reduce the error in the setting knob, always turn the setting
knob from the minimum setting toward the maximum setting.
7. Phase loss is detected for the K8AK-PA or K8AK-PM only when
the phase loss occurs between the input contacts and the power
supply. Phase loss is not detected on the load side.
8. Phase loss can be detected only from the input contacts to the
power supply side by the K8AK-PH, K8AK-PA, K8AK-PM, or
K8DS-PH. Phase loss cannot be detected from the input contacts
to the load side.
Mounting and Removing the K8AK
•Mounting to DIN Track
1. Catch the upper hook on the DIN Track.
2. Push the product onto the Track until the hooks lock into place.
•To remove the product, pull down on the bottom hook with a flat-
blade screwdriver and lift up on the product.
Mounting and Removing the K8DS
•The product may be mounted in any direction, but it must be
mounted securely and as level as possible.
•To mount the product to the DIN Track, hook it on the DIN Track at
(A) and then press in on the Unit in direction (B).
•To remove the product, insert a flat-blade screwdriver at (C) and
pull down the hook to release the Unit.
•Leave at least 30 mm of space between the product and other
devices to allow easy installation and removal.
Adjusting the Setting Knobs
•Use a screwdriver to adjust the setting knobs. The knobs have a
stopper that prevents them from turning beyond the full right or left
position. Do not force a knob beyond these points.
* (Not applicable to the K8AK-PH and K8DS-PH.)
Precautions for Correct Use
AB
PFP-100N (100 cm)
PFP-50N (50 cm)
Applicable DIN Tracks:
(A)
(B)
30 mm min.
(C)
Hook
Setting knob

Terms and Conditions of Sale
1. Offer; Acceptance. These terms and conditions (these "Terms") are deemed
part of all quotes, agreements, purchase orders, acknowledgments, price lists,
catalogs, manuals, brochures and other documents, whether electronic or in
writing, relating to the sale of products or services (collectively, the "Products")
by Omron Electronics LLC and its subsidiary companies (“Omron”). Omron
objects to any terms or conditions proposed in Buyer’s purchase order or other
documents which are inconsistent with, or in addition to, these Terms.
2. Prices; Payment Terms. All prices stated are current, subject to change with-
out notice by Omron. Omron reserves the right to increase or decrease prices
on any unshipped portions of outstanding orders. Payments for Products are
due net 30 days unless otherwise stated in the invoice.
3. Discounts. Cash discounts, if any, will apply only on the net amount of invoices
sent to Buyer after deducting transportation charges, taxes and duties, and will
be allowed only if (i) the invoice is paid according to Omron’s payment terms
and (ii) Buyer has no past due amounts.
4. Interest. Omron, at its option, may charge Buyer 1-1/2% interest per month or
the maximum legal rate, whichever is less, on any balance not paid within the
stated terms.
5. Orders. Omron will accept no order less than $200 net billing.
6. Governmental Approvals. Buyer shall be responsible for, and shall bear all
costs involved in, obtaining any government approvals required for the impor-
tation or sale of the Products.
7. Taxes. All taxes, duties and other governmental charges (other than general
real property and income taxes), including any interest or penalties thereon,
imposed directly or indirectly on Omron or required to be collected directly or
indirectly by Omron for the manufacture, production, sale, delivery, importa-
tion, consumption or use of the Products sold hereunder (including customs
duties and sales, excise, use, turnover and license taxes) shall be charged to
and remitted by Buyer to Omron.
8. Financial. If the financial position of Buyer at any time becomes unsatisfactory
to Omron, Omron reserves the right to stop shipments or require satisfactory
security or payment in advance. If Buyer fails to make payment or otherwise
comply with these Terms or any related agreement, Omron may (without liabil-
ity and in addition to other remedies) cancel any unshipped portion of Prod-
ucts sold hereunder and stop any Products in transit until Buyer pays all
amounts, including amounts payable hereunder, whether or not then due,
which are owing to it by Buyer. Buyer shall in any event remain liable for all
unpaid accounts.
9. Cancellation; Etc. Orders are not subject to rescheduling or cancellation
unless Buyer indemnifies Omron against all related costs or expenses.
10. Force Majeure. Omron shall not be liable for any delay or failure in delivery
resulting from causes beyond its control, including earthquakes, fires, floods,
strikes or other labor disputes, shortage of labor or materials, accidents to
machinery, acts of sabotage, riots, delay in or lack of transportation or the
requirements of any government authority.
11. Shipping; Delivery. Unless otherwise expressly agreed in writing by Omron:
a. Shipments shall be by a carrier selected by Omron; Omron will not drop ship
except in “break down” situations.
b. Such carrier shall act as the agent of Buyer and delivery to such carrier shall
constitute delivery to Buyer;
c. All sales and shipments of Products shall be FOB shipping point (unless oth-
erwise stated in writing by Omron), at which point title and risk of loss shall
pass from Omron to Buyer; provided that Omron shall retain a security inter-
est in the Products until the full purchase price is paid;
d. Delivery and shipping dates are estimates only; and
e. Omron will package Products as it deems proper for protection against nor-
mal handling and extra charges apply to special conditions.
12. Claims. Any claim by Buyer against Omron for shortage or damage to the
Products occurring before delivery to the carrier must be presented in writing
to Omron within 30 days of receipt of shipment and include the original trans-
portation bill signed by the carrier noting that the carrier received the Products
from Omron in the condition claimed.
13. Warranties. (a) Exclusive Warranty. Omron’s exclusive warranty is that the
Products will be free from defects in materials and workmanship for a period of
twelve months from the date of sale by Omron (or such other period expressed
in writing by Omron). Omron disclaims all other warranties, express or implied.
(b) Limitations. OMRON MAKES NO WARRANTY OR REPRESENTATION,
EXPRESS OR IMPLIED, ABOUT NON-INFRINGEMENT, MERCHANTABIL-
ITY OR FITNESS FOR A PARTICULAR PURPOSE OF THE PRODUCTS.
BUYER ACKNOWLEDGES THAT IT ALONE HAS DETERMINED THAT THE
PRODUCTS WILL SUITABLY MEET THE REQUIREMENTS OF THEIR
INTENDED USE. Omron further disclaims all warranties and responsibility of
any type for claims or expenses based on infringement by the Products or oth-
erwise of any intellectual property right. (c) Buyer Remedy. Omron’s sole obli-
gation hereunder shall be, at Omron’s election, to (i) replace (in the form
originally shipped with Buyer responsible for labor charges for removal or
replacement thereof) the non-complying Product, (ii) repair the non-complying
Product, or (iii) repay or credit Buyer an amount equal to the purchase price of
the non-complying Product; provided that in no event shall Omron be responsi-
ble for warranty, repair, indemnity or any other claims or expenses regarding
the Products unless Omron’s analysis confirms that the Products were prop-
erly handled, stored, installed and maintained and not subject to contamina-
tion, abuse, misuse or inappropriate modification. Return of any Products by
Buyer must be approved in writing by Omron before shipment. Omron Compa-
nies shall not be liable for the suitability or unsuitability or the results from the
use of Products in combination with any electrical or electronic components,
circuits, system assemblies or any other materials or substances or environ-
ments. Any advice, recommendations or information given orally or in writing,
are not to be construed as an amendment or addition to the above warranty.
See http://www.omron247.com or contact your Omron representative for pub-
lished information.
14. Limitation on Liability; Etc. OMRON COMPANIES SHALL NOT BE LIABLE
FOR SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES,
LOSS OF PROFITS OR PRODUCTION OR COMMERCIAL LOSS IN ANY
WAY CONNECTED WITH THE PRODUCTS, WHETHER SUCH CLAIM IS
BASED IN CONTRACT, WARRANTY, NEGLIGENCE OR STRICT LIABILITY.
Further, in no event shall liability of Omron Companies exceed the individual
price of the Product on which liability is asserted.
15. Indemnities. Buyer shall indemnify and hold harmless Omron Companies and
their employees from and against all liabilities, losses, claims, costs and
expenses (including attorney's fees and expenses) related to any claim, inves-
tigation, litigation or proceeding (whether or not Omron is a party) which arises
or is alleged to arise from Buyer's acts or omissions under these Terms or in
any way with respect to the Products. Without limiting the foregoing, Buyer (at
its own expense) shall indemnify and hold harmless Omron and defend or set-
tle any action brought against such Companies to the extent based on a claim
that any Product made to Buyer specifications infringed intellectual property
rights of another party.
16. Property; Confidentiality. Any intellectual property in the Products is the exclu-
sive property of Omron Companies and Buyer shall not attempt to duplicate it
in any way without the written permission of Omron. Notwithstanding any
charges to Buyer for engineering or tooling, all engineering and tooling shall
remain the exclusive property of Omron. All information and materials supplied
by Omron to Buyer relating to the Products are confidential and proprietary,
and Buyer shall limit distribution thereof to its trusted employees and strictly
prevent disclosure to any third party.
17. Export Controls. Buyer shall comply with all applicable laws, regulations and
licenses regarding (i) export of products or information; (iii) sale of products to
“forbidden” or other proscribed persons; and (ii) disclosure to non-citizens of
regulated technology or information.
18. Miscellaneous. (a) Waiver. No failure or delay by Omron in exercising any right
and no course of dealing between Buyer and Omron shall operate as a waiver
of rights by Omron. (b) Assignment. Buyer may not assign its rights hereunder
without Omron's written consent. (c) Law. These Terms are governed by the
law of the jurisdiction of the home office of the Omron company from which
Buyer is purchasing the Products (without regard to conflict of law princi-
ples). (d) Amendment. These Terms constitute the entire agreement between
Buyer and Omron relating to the Products, and no provision may be changed
or waived unless in writing signed by the parties. (e) Severability
. If any provi-
sion hereof is rendered ineffective or invalid, such provision shall not invalidate
any other provision. (f) Setoff. Buyer shall have no right to set off any amounts
against the amount owing in respect of this invoice. (g) Definitions. As used
herein, “including” means “including without limitation”; and “Omron Compa-
nies” (or similar words) mean Omron Corporation and any direct or indirect
subsidiary or affiliate thereof.
Certain Precautions on Specifications and Use
1. Suitability of Use. Omron Companies shall not be responsible for conformity
with any standards, codes or regulations which apply to the combination of the
Product in the Buyer’s application or use of the Product. At Buyer’s request,
Omron will provide applicable third party certification documents identifying
ratings and limitations of use which apply to the Product. This information by
itself is not sufficient for a complete determination of the suitability of the Prod-
uct in combination with the end product, machine, system, or other application
or use. Buyer shall be solely responsible for determining appropriateness of
the particular Product with respect to Buyer’s application, product or system.
Buyer shall take application responsibility in all cases but the following is a
non-exhaustive list of applications for which particular attention must be given:
(i) Outdoor use, uses involving potential chemical contamination or electrical
interference, or conditions or uses not described in this document.
(ii) Use in consumer products or any use in significant quantities.
(iii) Energy control systems, combustion systems, railroad systems, aviation
systems, medical equipment, amusement machines, vehicles, safety equip-
ment, and installations subject to separate industry or government regulations.
(iv) Systems, machines and equipment that could present a risk to life or prop-
erty. Please know and observe all prohibitions of use applicable to this Prod-
uct.
NEVER USE THE PRODUCT FOR AN APPLICATION INVOLVING SERIOUS
RISK TO LIFE OR PROPERTY OR IN LARGE QUANTITIES WITHOUT
ENSURING THAT THE SYSTEM AS A WHOLE HAS BEEN DESIGNED TO
ADDRESS THE RISKS, AND THAT THE OMRON’S PRODUCT IS PROP-
ERLY RATED AND INSTALLED FOR THE INTENDED USE WITHIN THE
OVERALL EQUIPMENT OR SYSTEM.
2. Programmable Products. Omron Companies shall not be responsible for the
user’s programming of a programmable Product, or any consequence thereof.
3. Performance Data. Data presented in Omron Company websites, catalogs
and other materials is provided as a guide for the user in determining suitabil-
ity and does not constitute a warranty. It may represent the result of Omron’s
test conditions, and the user must correlate it to actual application require-
ments. Actual performance is subject to the Omron’s Warranty and Limitations
of Liability.
4. Change in Specifications. Product specifications and accessories may be
changed at any time based on improvements and other reasons. It is our prac-
tice to change part numbers when published ratings or features are changed,
or when significant construction changes are made. However, some specifica-
tions of the Product may be changed without any notice. When in doubt, spe-
cial part numbers may be assigned to fix or establish key specifications for
your application. Please consult with your Omron’s representative at any time
to confirm actual specifications of purchased Product.
5. Errors and Omissions. Information presented by Omron Companies has been
checked and is believed to be accurate; however, no responsibility is assumed
for clerical, typographical or proofreading errors or omissions.

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Fax: [phone]
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Cat. No. N22I-E-01 10/13Note: Specifications are subject to change. © 2013Omron Electronics LLC Printed in U.S.A.