Omega Products CN101C-4000F Installation Manual

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TABLE OF CONTENTS

CNIOO SERIES TEMPERATURE MONITORS

SECTION PAGE

SECTION 1 INTRODUCTION 1

1.1 General Description 1

1.2 Available Models 1

SECTION 2 INSTALLATION 3

2.1 Unpacking 3

2.2 Controller Location 3

2.3 Mounting 3

2.4 Wiring Power Circuit 4

2.5 Sensor Placement 4

2.8 Setup Procedure 5

SECTION 3 OPERATION 6

3.1 Operation 6

3.1.1 Controls and Indicators 6

3.1.2 Relay Output 7

3.2 Adjusting Setpoints 7

3.3 Adjusting Scan Time 7

SECTION 4 SERVICE INFORMATION 7

4.1 Maintenance

4.2 Test Procedure 7

4.2.1 Visual Inspection 7

4.2.2 Functional Observation 7

4.2.3 Calibration Temperature 9

4.2.4 Calibration Alarm 10

4.2.5 Zone Crosstalk 10

4.3 Troubleshooting 11

SECTION 5 SPECIFICATIONS 12

5.1 Thermocouple 12

5.2 RTD 13

5.3 Parts List 14

5.4 Calibration Charts 17

5.4.1 Calibration Table 0-2000

5.4.2 Calibration Table 0-500

5.4.3 Calibration Table 0-250

0

F-Type K 18

0

F-Type K 19

0

C-RTD 20

5.5 Component Layouts 21

5.8 Schematic 23

7

SECTION 1 INTRODUCTION

1.1 GENERAL DESCRIPTION

The OMEGA® CN100 Series temperature monitor is a tempera­ture indicator with either high or low alarms. The six input
channels accept independent thermocouple inputs, and there is
an individual setpoint for each channel. In operation, the CN100
will scan each channel for 4 to 12 seconds (via side adjustment),
and the display will indicate the temperature measured by the
individual thermocouples. A red LED indicates an alarm condi­tion; in the event of an alarm, scanning is halted and the relay de­energizes, until the manual reset button is depressed. The
CN101 models are high temperature alarms, while the CN102
units will alarm on low temperatures.

The CN102 models also feature a built-in cold start alarm
suppression. When the “START UP” LED is lit, the alarm action
is suspended until the temperatures of each input reach their
respective setpoints. Power failures for less than 30 minutes do
not affect the start-up operation.

1.2 AVAILABLE MODELS

CN101(*)-(**) HIGH ALARM

1

CN102(*)-(**) LOW ALARM

RTD#

2

SECTION 2 INSTALLATION

2.1 UNPACKING

Remove the packing list and verify that all equipment has been
received. If there are any questions about the shipment, please
call OMEGA Customer Service Department.

Upon receipt of shipment, Inspect the container and equip­ment for any signs of damage. Take particular note of any
evidence of rough handling in transit. Immediately report any
damage to the shipping agent.

NOTE

The carrier will not honor any claims unless all
shipping materiel is saved for their examination.
After examining and removing contents, save
packing material and carton in the event reship­ment is necessary.

2.2 CONTROLLER LOCATION

Select a location for the controller that is free from excessive
shock, vibration, dirt, moisture, and oil. The ambient tem­perature should be between 30° and 130°F(-1° and 54°C).

2.3 MOUNTING

Mount the controller into a 3 5/8” (92mm) square cutout. Refer
to Figure 2-1 for the cutout and case dimensions. The plug­in controller does not have to be removed from its housing for
mounting.

Remove the two screws that hold the mounting slides; then
remove the slides. Insert the case into the cutout from the
front side of the panel and reinstall the two slides and two
screws. The length of the slides must be reduced if the con­troller is to be mounted in an extra thick panel. If the control­ler has been unplugged from its housing, the top of the hous­ing can be determined by the serial tag.

.

3

Figure 2-1. Outline Dimensions

2.4 WIRING POWER CIRCUIT

The controller operates on either 120 or 240 VAC, 50 to
60Hz line voltage when connected to the proper terminals.
Incoming power lines should be properly fused. Refer to
Figure 2-2.

NOTE

Fuse incoming high side of line with fast blow fuse
of appropriate rating. Shorted heater or wiring will
destroy the relay or output Triac.

2.5 SENSOR PLACEMENT

Proper sensor placement is essential. It can eliminate
many problems in the total system. The probe should be
placed so that it can detect any temperature change with
little thermal lag. In a process that requires fairly constant
heat output, the probe should be placed close to the heater.
In processes where the heat demand is variable, the probe
should be close to the work area. Experimenting with probe
location can often provide optimum results.

In an ice bath process, the addition of a stirrer will help to
eliminate lags. Some RTD’s are shock sensitive and
require care in handling and installation.

4

2.2 SET UP PROCEDURE

Wire the instrument as shown in Figure 2-2. Observe polarity
(on the thermocouples red is always negative, on RTDs black
is negative) and short all the unused zone inputs (do not short
the analog output). Turn all the setpoints fully CW on CN101
models and CCW on the CN102 models. Power up the
instrument. If any zone alarms, check for open thermo­couples or setpoints turned the opposite way. Correct the
problem and push the RESET button. Observe the scanning
rate and readjust if needed at the side of the instrument. Push
the SET button and release. The green light should appear for
about 10 seconds and the display indicates the setpoint Adjust
the setpoint of the indicated zone to the desired alarm tem­perature. If more time Is needed, push the SET button to get
an additional 10 seconds. Wait for the green light to disappear
and repeat the procedure for all used zones. For unused
zones, leave the setpoints fully CW for CN101 models and
fully CCW for CN102 models.

Figure 2-2. Wiring Diagram

5

SECTION 3 OPERATION

3.1 OPERATION

The typical control system contains the sensor, controller and
the process. The thermocouple sensor produces a small
voltage change proportional to the measured temperature of
the process. An RTD produces a change in resistance
proportional to the measured temperature of the process.
This is linearized in a unique active circuit, and amplified by the
controller, where it is compared with setpoint temperature. If
the temperature of the sensor is above setpoint, the output
circuitry will be actuated. This is indicated by means of an LED
light. The digital meter displays the sensor’s process tem­perature, and when switched, displays the alarm setpoints.
Six zones share common amplifier and display.

3.1.1 Controls and Indicators (Refer to Figure 3-1)

1. LED Display (temperature or setpoint)

2. Setpoint (displayed by green LED)

3. Start Up button—cold start (CN102 only)

4. Alarm Light (red LED)

5. Zone Light (yellow LED)

6. Setpoint Control

7. Setpoint Enable

8. Manual Alarm Reset

9. Scan Time Adjust

10. Calibration LO and HI potentiometers

6