Omron K2CU DATASHEET

Heater Element Burnout Detector

K2CU

Accurate Detection of Heater Element Burnout Regardless of Heater Capacities

Accurately detects a burned heater element or elements incorporated by a molding machine or packing machine and outputs an alarm signal.

Precisely singles out the burned element even if one heater element among several heater elements has been burned out.

Applicable to small- to large-capacity heater elements.

All K2CU-F large-capacity, built-in current transformer models work with both single-phase and three-phase heaters.

Voltage fluctuation compensation function eliminates false alarms due to variations in the supply voltage.

Ordering Information

K2CU-FjjA-jGS Model with Gate Input Terminals

Control

supply voltage

4 to 10 A 8 to 20 A

100 V

AC W

ith voltage fluctuation

1

10 V

AC compensation K2CU-F10A-DGS K2CU-F20A-DGS K2CU-F40A-DGS K2CU-F80A-DGS

200 V

AC K2CU-F10A-EGS K2CU-F20A-EGS K2CU-F40A-EGS K2CU-F80A-EGS

220 V

AC K2CU-F10A-FGS K2CU-F20A-FGS K2CU-F40A-FGS K2CU-F80A-FGS

K2CU-F10A-CGS K2CU-F20A-CGS K2CU-F40A-CGS K2CU-F80A-CGS

Operating current

16 to 40 A 32 to 80 A

K2CU-F Large-capacity, Built-in Current Transformer Models

Control

supply voltage

4 to 10 A 8 to 20 A

100 V

AC W

ith voltage fluctuation

1

10 V

AC compensation K2CU-F10A-D K2CU-F20A-D K2CU-F40A-D K2CU-F80A-D

200 V

AC K2CU-F10A-E K2CU-F20A-E K2CU-F40A-E K2CU-F80A-E

220 V

AC K2CU-F10A-F K2CU-F20A-F K2CU-F40A-F K2CU-F80A-F

K2CU-F10A-C K2CU-F20A-C K2CU-F40A-C K2CU-F80A-C

Operating current

16 to 40 A 32 to 80 A

K2CU-P Small-capacity, Plug-in Models

Control

100/ 200 V

110/ 220 V

supply voltage

W

ith voltage fluctuation

AC

compensation W

ithout voltage

fluctuation compensation W

ith voltage fluctuation

AC

compensation W

ithout voltage

fluctuation compensation

0.25 to 0.5 A

K2CU-P0.5A-A K2CU-P1A-A K2CU-P2A-A K2CU-P4A-A

--- K2CU-P1-A K2CU-P2-A K2CU-P4-A

K2CU-P0.5A-B K2CU-P1A-B K2CU-P2A-B K2CU-P4A-B

--- K2CU-P1-B K2CU-P2-B K2CU-P4-B

Operating current

0.5 to 1 A

1 to 2 A 2 to 4 A

1

K2CU

Specifications

Ratings

Item K2CU-F K2CU-P

Control

supply voltage Rated frequency Carry current

Operating voltage range V

oltage fluctuation compensation

range

Operating current

Releasing current Operate time Gate input voltage range (for

models with gate input terminals) Control output Power consumption

100, 1

10, 200, 220 V

50/60 Hz

1.25 times as large as each model’ maximum operating current

85% to 1 85% to 1

4 to 10 A, 8 to 20 A, 16 to 40 A, 32 to 80 A (continuously variable)

105% max. of operating current

0.5 s max. (when current changes from 150% to 0%) 5 to 30 VDC

2 A at 220 V Input: 0.5 V

Power supply: 5 V

10% of control supply voltage 10% of control supply voltage

A max.

AC

AC, SPDT (cosφ

A max.

= 0.4)

100/200, 1

s

2.5 A for K2CU-P0.5A-A/-B; 5 A

85% to 1 (applicable only on models with voltage fluctuation compensation)

0.25 to 0.5 A, 0.5 to 1 A, 1 to 2 A, 2 to 4 A (continuously variable)

1

10% max. of operating current

---

Input: 1 V Power supply: 4 V

10/220 V

10% of control supply voltage

A max.

AC

A max.

K2CU

Characteristics

Setting

accuracy Repeat accuracy Influence of temperature Influence of voltage

Influence of frequency Insulation resistance Dielectric strength Overcurrent V

ibration resistance Shock resistance Ambient temperature Ambient humidity Weight

Note: The

logical value is an operating value within a range of 0.85 to 1.1 with a voltage fluctuation of 85% to 1

control

supply voltage measured as 1.

±

7% max.

±

3% max.

±

10% max. (at 20

Models without voltage fluctuation compensation:

±

3% max. of the value measured at the control supply voltage, on condition that the voltage fluctuation is 85% to 1 Models with voltage fluctuation compensation:

±

5% max. of the logical value, on condition that the voltage fluctuation is 85% to 1 control supply voltage. (see note)

±

3% max. (at ±5% of rated frequency) 10 MΩ min. (at 500 VDC) between electric circuits and mounting panel 2,000 V

AC, 50/60 Hz for 1 min between electric circuits and mounting panel 20 times of max. set value of operating current for 2 s Destruction: 16.7 Hz, 1-mm double amplitude for 10 min each in X, Y Destruction: 100 m/s2 (approx. 10G) Operating: –10°C to 55°C (with no icing) Operating: 45% to 85% K2CU-F: approx. 390 g; K2CU-P: approx. 300 g

°C±30°C)

10% of the control supply voltage

10% of the

, and Z directions

10%, based on the value at the

2

K2CU

Operation

K2CU-F A- GS

When

power is supplied to the heater (when the SSR is ON), a cur rent flows through the wires to the heater elements. At the same time, a voltage is imposed on the gate circuit and the K2CU-FjjAjGS begins monitoring the current flowing through the

heater wires.

The current flowing to the heater wires is detected by the detector sections through each Current Transformer (CT) incorporated by the K2CU-FjjA-jGS.

The

current signals transmitted by the two CT rent-voltage converters, smoothing circuits, and comparators as shown

in the diagram.

Power source

Series

s are sent to the cur

The

signal generated by the reference voltage generator is sent to

the

-

setting circuit to provide a reference value. The reference value is sent to the comparators. Each comparator compares its heater element

current input

and the reference value. If the input is lower

than the reference value, a signal is sent to the output circuit. There

are two

the

input signals from the CT output

detector sections operating independently

s is lower than the reference value, the

relay and alarm indicator will be activated.

The K2CU-FjjA-jGS incorporates a voltage fluctuation com-

-

pensation if

the supply voltage fluctuates.

function which automatically corrects the reference value

K2CU

. If either of

SSR DC

CT

1

CT

2

Heater elements

Currentvoltage converter

Note: 1. The

Smoothing circuit

Gate circuit

Comparator

dotted lines indicate the line conductors passing through the windows of the current transformers.

2.

The current flowing into the gate circuit (between G+ and G–) is as follows: Approximately 1.4 mA at 5 VDC Approximately 3.4 mA at 12 VDC Approximately 6.7 mA at 24 VDC

3

When using a K2CU which has the model number suf terminals), the control output of the temperature controller must be a voltage output type.

Temperature controller

Setting circuit

Reference voltage generator

Output circuit

Power circuit

To each circuit

Output relay

X CM1

Alarm indicator

fix ”GS” (a model that incorporates gate input

S2S1G–G+

b1

X/c

a1

Buzzer

BZ

3

K2CU

K2CU-F

When

Series

power is supplied to the heater (when the contactor

is ON), a current flows through the wires to the heater elements. At the same time,

a voltage is imposed on the power circuit of the K2CU-F

.

The current flowing to the heater wires is detected by the detector sections through each Current Transformer (CT) incorporated by the K2CU-F.

The

current signals transmitted by the two CT

s are sent to the cur

rent-voltage converters, smoothing circuits, and comparators as shown

in the diagram.

Power source

Contactor

CT

1

Currentvoltage converter

CT

2

Currentvoltage converter

Smoothing circuit

Comparator

The

signal generated by the reference voltage generator is sent to

the

setting circuit to provide a reference value. The reference value is sent to the comparators. Each comparator compares its heater element

current input

and the reference value. If the input is lower

than the reference value, a signal is sent to the output circuit. There

are two

the

input signals from the CT output

The

K2CU-F incorporates a voltage

detector sections operating independently

s is lower than the reference value, the

relay and alarm indicator will be activated.

fluctuation compensation func tion which automatically corrects the reference value if the supply voltage

fluctuates.

S2S1

Setting circuit

Reference voltage generator

Output circuit

Power circuit

To each circuit

Output relay

b1

X/c

a1

X CM1

Buzzer

BZ

. If either of

-

Note: The

Heater elements

K2CU-P

The

Series

K2CU-P operates basically in the same way as the K2CU-F

dotted lines indicate the line conductors passing through the windows of the current transformers.

The comparator compares external current signals and the reference value and outputs the result of the comparison to the output circuit.

Power source

Contactor

1

CT

Currentvoltage

2

converter

Smoothing circuit

.

Setting circuit

Reference voltage generator

To each circuit

Comparator

Alarm indicator

200/220 V 100/110 V 0 V

6

Power circuit

Output circuit

X

Output relay

X/c

Alarm indicator

87

5

4

Buzzer

3

BZ

Heater elements

4

K2CU

Setting of Operating Current

Use the potentiometer on the front panel to set the operating current.

the knob to set the desired current value at which the

Rotate Burnout

Detector should operate. Do

minimum

positions.

not exceed the maximum and

Heater

The K2CU-F’s scale is divided into 12 graduations including subgraduations

The are

knobs of

and the K2CU-P’

the K2CU-F and K2CU-P as shown in the illustrations

s scale is divided into 5 graduations.

set to 32 A and 0.7 A respectively

.

Knob

Heater Connection and Current

The

following table shows the dif

heater

elements under normal and abnormal conditions.

Phase

Single phase

ferent connections possible. The formula under each illustration indicates the electrical current value of

Normal condition

5 A

The

set operating current is defined as the mean value

of the heater current under normal operating conditions and the heater current under

a burnout or abnormal condition.

Set value =

Normal current + abnormal current

2

Red point (indicates the set value)

the

Abnormal condition

0 A

Three phase

Delta network

Star network

V network

Note: Values

200 V

(5 A x = 8.7 A)

1 kW

5 A

8.7 A

(5 A x )

2.9 A

1

(5 A x )

5 A

8.7 A

5 A

3

1 kW

3

1 kW

3

1 kW

in this table are correct when a 200 V

200 V

0 A

1 kW

7.5 A

(5 A x x )

3

2.5 A

1

3

2.5 A

3

2

(5A x 1/2)

(5 A x x )

3

2

5 A

8.7 A

5 A

(5 A x x )

2.5 A

(5 A x x )

5 A

(5A x 1)

AC, 1 kW heater is used on a single-phase or three-phase current.

1

3

1

3

2

3

5