External Connection Example - Omron K8AC-H11CC-FLK Manual

K8AC-H

External Connection Example

Wiring Method When Using the K8AC-H with SSR Control Heaters
Power supply
1 2
7 8
SSR
CT1
CT2
Heater
Wiring Method When Using the K8AC-H with ON/OFF Control Heaters
Power supply
1 2
7 8
Contactor
CT1
CT2
Heater
8
RS-485
Transistor Output
13 14
K8AC-H2@@N-FLK
3
4
5
6
9 10 11 12
Temperature
Controller
(DC voltage output)
RS-485
Transistor Output
13 14
K8AC-H2@@N-FLK
3
4
5
6
9 10 11 12
24-VDC
power supply
Temperature
X Controller
(relay output)
Operation Description
• If the heater current detected at either CT1 or CT2 falls below the
burnout alarm set value, an alarm is output. The burnout alarm set
value can be set separately for CT1 and CT2.
No burnout alarm is output, however, when the temperature con-
troller control output is OFF.
Burnouts are detected only while the temperature controller control
3
output is being input to the gate input terminals (11 and 12).
Faulty outputs do not occur because heater burnout detection is
4
linked with the temperature controller.
• The minimum burnout detection time is 200 ms. Shorter burnouts
are not detected.
5
• Turn ON the voltage fluctuation compensation function (default: OFF)
to detect power supply voltage fluctuations and automatically compen-
6
sate the burnout alarm value. Also, turn ON the voltage fluctuation
compensation function to detect minor current fluctuations.
Correct Usage
• Always take the power supply voltage from the primary side of the SSR.
• Use temperature controllers with a 12 or 24-VDC voltage output
(30 VDC max.).
• CT1 and CT2 are special products. Use the K8AC-CT@@.
• The CTs do not have polarity.
• Connect only one CT for single-phase heaters.
• Connect two CTs for three-phase heaters.
• For three-phase heaters, always set the burnout alarm set values
for both CT1 and CT2.
Operation Description
• If the heater current detected at either CT1 or CT2 falls below the
burnout alarm set value, an alarm is output. The burnout alarm set
value can be set separately for CT1 and CT2.
No burnout alarm is output, however, when the temperature con-
troller control output is OFF.
Burnouts are detected only while the temperature controller control
3
output is being input to the gate input terminals (11 and 12).
4
Faulty outputs do not occur because heater burnout detection is
linked with the temperature controller.
• The minimum burnout detection time is 200 ms. Shorter burnouts
are not detected.
5
• Turn ON the voltage fluctuation compensation function (default: OFF)
6
to detect power supply voltage fluctuations and automatically compen-
sate the burnout alarm value. Also, turn ON the voltage fluctuation
compensation function to detect minor current fluctuations.
Correct Usage
• Always take the power supply voltage from the primary side of the SSR.
• Use a temperature controller with relay output.
• The input to the gate input terminals (11 and 12) must be a DC volt-
age input, so wire the 24-VDC power supply as shown in the dia-
gram to the left.
• CT1 and CT2 are special products. Use K8AC-CT@@.
• The CTs do not have polarity.
• Connect only one CT for single-phase heaters.
• Connect two CTs for three-phase heaters.
• For three-phase heaters, always set the burnout alarm set values
for both CT1 and CT2.