OMRON CJ1W-SCU21-V1 PLC

OMRON CJ1W-SCU21-V1 PLC

Heater Burnout (HB) Alarm

Item

Maximum heater current

Indication accuracy of input current

Heater burnout alarm setting range

Single-phase AC, 50 A

Specification

±5% of full scale ± 1 digit max.

0.1 to 49.9 A (0.1 A units)

The heater burnout detection function will not operate if the set value is set to 0.0 A or 50.0 A.

(When the SV is 0.0 A, the heather burnout alarm will be OFF. When the SV is 50.0 A, the heater burnout

alarm will be ON.)

Min. detectable ON time *

200 ms

* If the control output is ON for less than 200 ms, the heater burnout detection function will not operate and heater current measurement will not

be performed.

Current Transformer (CT) Ratings

Item

E54-CT1

CJ1W-SCU21-V1

Max. continuous heater current

Dielectric strength

Vibration resistance

Weight

Accessories

50A

1.000 VAC (1 min.)

50 Hz, 98 m/s2

Approx. 11.5 g

None

E54-CT3

120 A *

Approx. 50 g

Contacts (2)

Plugs (2)​

Note: Do not use any Current Transformer (CT) other than the OMRON E54-CT1 or E54-CT3 Current Transformer.

* The maximum continuous heater current that can be detected at a CJ1W-TC@@@ Temperature Control Unit is 50 A

Input Specifications

When the Unit is used with CJ-series CPU unit

A switch on the front of the Unit (pin 3 of the DIP switch) selects whether the Temperature Control Unit’s data is stored and indicated as 4-digit

BCD or binary (i.e., 4-digit hexadecimal). Pin 2 of the DIP switch selects whether the temperature is indicated in °C or °F.

The indicated range will be within ±20°C or ±20°F of the setting ranges shown in the following table. *1

Thermocouple Input Setting Ranges

Platinum Resistance Thermometer Input Setting Ranges

Note:When the input type setting switch has been changed, the SV and input compensation values will change as follows:

• If the SV exceeds the setting range, it will be fixed at the lower limit or upper limit of the setting range.

• The position of the decimal point will change if necessary.

For example, when the temperature range is changed by changing the input type setting switch from 0 (K-type thermocouple with a

temperature range of −200 to 1.300°C) to 1 (K-type thermocouple with a temperature range of 0.0 to 500.0°C), an SV of 200°C would be

changed to 20.0°C.

*1. If the allowed indication range is exceeded, a sensor error will occur, the corresponding Sensor Error Flag will be turned ON, and the PV will

contain the data “CCCC.” When a sensor error occurs, that control loop’s control output will be turned OFF. The alarm function will operate

because the PV indicates an abnormally high temperature.

*2. The lower limit for B thermocouple is 0°C or 0°F.

*3. The indicator range for BCD display will be clamped at the lower or upper limit in the region between the lower or upper limit of the setting range

and the point where a sensor error occurs.

When the display units are 0.1°C or 0.1°F, the display’s lower limit value is −99.9 and the upper limit value is 999.9.

No. Input type °C °F

16-bit binary BCD 16-bit binary BCD