K2CU-F10A-C AC4-10A AC100 Omron, K2CU-F10A-C AC4-10A AC100 Datasheet - Page 13

• Manufacturer Part Number: K2CU-F10A-C AC4-10A AC100
• Description: HEATER FAULT DETECTOR
• Manufacturer: Omron
• Series: K2CUr

Specifications of K2CU-F10A-C AC4-10A AC100

• Current Rating: 4.0 ~ 10 A
• Mounting Type: Panel
• Operational Type: Large, Built in Transformer
• Voltage - Supply: 100 VAC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Gate Input: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: K2CU-F10A-CAC4-10AAC100; K2CUF10ACAC410AAC100

Note: 1. This table shows the respective change rates in current when any one of several elements connected in parallel has burned out.
Connection
Single-
phase
Star
Delta
Q
Q
Q
2. The values in the table are current ratios after one element burns out in comparison to a normal current of “1” (i.e., the current before the
3. The values in this table are logical values. These values may vary slightly because of influence of unbalanced loads (heaters). It is there-
What settings are required to connect more than one heater in parallel?
The following table shows relative changes in the current when any one of several elements connected in parallel has burned out. Use this
table as a guideline in determining the current setting. The degree of change in the current when an element burns out may be too small
to detect if more than five elements are connected in parallel. As a rule, do not connect more than 5 elements in parallel.
Can the K2CU be used for heaters with a voltage of 400/
440?
Yes. It can be used if a power transformer is used to drop the
voltage applied to the control power supply voltage terminals
of the K2CU to 100 to 220 V.
Can the K2CU be used for three-phase circuits with
unbalanced currents?
Unbalanced currents can exist because of different heater
capacities or because different numbers of elements are
connected to each phase, causing the current for each phase
to be different even during normal operation.
There is only one setting provided for the two holes on the
K2CU, so the setting must be made below the current value
for the phase with the lowest current. This could prevent the
current from dropping below the set value depending on the
element that burns out. It is thus not possible to detect heater
burnouts for all elements connected with unbalanced
currents. Either balanced circuits must be used, or a separate
K2CU must be installed for each phase.
element burns out).
fore recommended to test the actual current values and the load condition before determining the operating current, especially when the
current under the normal condition and that under an abnormal condition do not significantly differ.
No. of heater
per phase = n
I
I
I
No. of heater = n
http://www.ia.omron.com/
ALL DIMENSIONS SHOWN ARE IN MILLIMETERS.
To convert millimeters into inches, multiply by 0.03937. To convert grams into ounces, multiply by 0.03527.
No. of heater
per phase = n
Q & A
Current in burned-out phase I is 0 when one
Current in other phases
Current in burned-out phase 0.58
Current in other phases
In the interest of product improvement, specifications are subject to change without notice.
I is 0 when one
element burns
out
element burns
out
0.87
1
n = 1
Q
0.5
0.6
0.92
0.77
1
(c)Copyright OMRON Corporation 2008 All Rights Reserved.
n = 2
Can the control power supply for the K2CU be connected
from a separate circuit from the one used for the heater
circuit?
With a model with a large-capacity, built-in current
transformer, changes in the control power supply voltage are
used in compensating the reference value for the internal
setting circuit. A large error may occur in the operating value
if power is supplied from a separate circuit.
0.67
0.75
0.95
0.84
1
n = 3
0.75
0.82
0.96
0.88
1
n = 4
0.8
0.86
0.97
0.91
1
K2CU
n = 5
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