K8AC-CT20S Omron, K8AC-CT20S Datasheet - Page 14

• Manufacturer Part Number: K8AC-CT20S
• Description: CURRENT TRANSFORMER .2-22A
• Manufacturer: Omron
• Series: K8ACr

Specifications of K8AC-CT20S

• Accessory Type: Current Transformer
• For Use With/related Products: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: K8ACCT20S

14
K8AC-H
Settings Method
Settings Methods for SSR and ON/OFF Control Heaters
Settings Conditions
Detecting burnouts in just one heater when ten 300-W rated heaters
are connected in parallel to a single-phase 200-V power supply.
The heater is SSR controlled.
Normal Heater Current and Heater Current with One
Heater Element Burnout
Selecting Heater Element Burnout Detector Models
For the above example, K8AC-H12C@-FLK would be selected.
The burnout alarm set value is 14.3 A, so the current input range 2.00
to 22.00 A should be selected.
SSR control is used, so type C should be selected. (Type C is also
selected for ON/OFF control.)
Select the appropriate relay or transistor output specifications,
depending on the application.
Settings Method for Cyclic and Phase Control Heaters
Settings Conditions
Detecting burnouts in one heater when five 1,000 W-rated heaters are
connected to each phase of a three-phase delta-connected 200-V
power supply.
A power regulator (phase control) performs heater control.
Normal Heater Current and Heater Current With One
Heater Element Burnout
Selecting Heater Element Burnout Detector Models
For the above example, K8AC-H13P@-FLK would be selected.
The burnout alarm set value is 41.4 A, so the current input range 20.0
to 200.0 A should be selected.
Phase control is used, so type P should be selected. (Type P is also
selected for cyclic control.)
Select the appropriate relay or transistor output specifications,
depending on the application.
K8AC-H Parameter Settings Procedure
1. Turn ON the power to the K8AC-H. The initial status when power
2. Press the L Key for at least 3 s to change from Run Mode to
3. Change from Adjust Mode to Set Mode (the default settings mode
4. Set the heater control method parameter to PH-3 (three-phase
5. Press the L Key for at least 1 s to change from Set Mode to Adjust
Note: The default setting for functions including the voltage
Normal current = (300 W × 10 (heaters))/200 V = 15.0 A
Current with one burnout = (300 W × 9)/200 V = 13.5 A
Example: When One of Five Single-phase Heaters (R-S) Burns
Out
Normal current =
Current with one burnout = 43.3 A × 0.91 = 39.4 A
(Refer to Rate of Change for Currents with Parallel Heaters on
page 10.)
(Only the minimum settings are shown here. Refer to pages 16 to
18 for information on how to set parameters.)
is turned ON is called Run Mode.
Adjust Mode (the mode for adjusting burnout alarm set values.)
for all functions). The password “0169” is required to move to Set
Mode.
control).
The default setting is PH-1 (single-phase control).
Note: Set the parameter to CYCL (cyclic control) when using
Mode. Press the L Key again for at least 1 s to change from
Adjust Mode to Run Mode.
(Normal current + current at malfunction)
Heater burnout alarm set value =
Heater burnout alarm set value =
fluctuation compensation function, alarm hysteresis, output
Normal current + current at malfunction
cyclic control.
3
2
(1,000 W × 5 (heaters))/200 V = 43.3 A
2
=
=
15.0 + 13.5
43.3 + 39.4
2
2
= 14.3 A
=
41.4 A
K8AC-H Parameter Setting Procedure
1. Turn ON the power to the K8AC-H. The initial status when power
2. Press the L Key for at least 3 s to change from Run Mode to
3. Set the burnout alarm set values. (AL-1 = CT1 burnout alarm set
4. Change to Run Mode.
5. Check operation.
Note: The default setting for functions including the voltage
Burnout Alarm Set Value Setting Method
Setting Method
Note: 1. The K8AC-H automatically adjusts burnout alarm levels to
• Wire the K8AC-H, temperature controller (4 to 20 mA current
• Press the L Key on the K8AC-H for at least 3 s to change from
• AL-1 (CT1 burnout alarm set value) will be displayed when the
• Next, disconnect one heater and note the heater current in this
• Set the K8AC-H burnout alarm set value based on the results. The
• In this setting example, the set value for AL-2 (CT2 burnout alarm
(Only the minimum settings are shown here. Refer to pages 16 to
18 for information on how to set parameters.)
output type), and power regulator (phase control).
Run Mode to Adjust Mode.
mode is changed to Adjust Mode. Press the S key once when AL-
1 is displayed. Next, press the U Key once. The present heater
current value will be displayed on the main display, so note this as
the normal current value. Always have the temperature controller
output at 20.0 mA at this time (See note 1.)
burnout state. Alternatively, use the current when one heater is
burned out (calculated earlier) as the current during malfunction. It
is recommended that the current at an actual burnout is confirmed.
burnout alarm set value is set at the mid-point between the normal
current and the current at malfunction, taking errors and variations
in heater capacity into consideration.
setting) is the same as the set value for AL-1. (See note 2.)
is turned ON is called Run Mode.
Adjust Mode (the mode for adjusting burnout alarm set values.)
value and AL-2 = CT2 burnout alarm set value.)
Set “14.3” to AL-1.
Set the AL-2 burnout alarm set value to “----” so that it will not
detect heater burnout, because this is a single-phase heater.
Press the L Key while in Adjust Mode for at least 1 s to change
to Run Mode.
Test heater burnout detection by burning out one heater.
Also check that there are no malfunctions during temperature
control.
fluctuation compensation function, alarm hysteresis, output
ON-delay time, and SSR error detection function is OFF. Turn
ON any of these functions as required.
ON-delay time, and SSR error detection function is OFF. Turn
ON any of these functions as required.
2. If the heater capacity is unbalanced, the burnout alarm
compensate based on the temperature controller current
output. The burnout alarm value must be set when the
temperature controller output is at 100% (20 mA), so be
sure to have the temperature controller at 20 mA output.
values for CT1 and CT2 may not be the same.